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钢芯铝绞线股丝分层应力计算方法的研究
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作者 杨光耀 温作铭 +3 位作者 顾乡 吴明埝 尤伟任 徐欣 《电线电缆》 2023年第3期40-45,共6页
准确评估导线的股丝分层应力可为架空输电线路工程设计、导线选型提供理论依据和指导。以钢芯铝绞线为研究对象,考虑每一层股丝的温度、节径比、泊松比、弹性模量及线膨胀系数等因素的影响,再根据导线整体轴向张力进行修正,提出了一种... 准确评估导线的股丝分层应力可为架空输电线路工程设计、导线选型提供理论依据和指导。以钢芯铝绞线为研究对象,考虑每一层股丝的温度、节径比、泊松比、弹性模量及线膨胀系数等因素的影响,再根据导线整体轴向张力进行修正,提出了一种钢芯铝绞线股丝分层应力的计算方法,并采用二分法进行求解。在不同张力下,对钢芯铝绞线进行分层应变、应力试验,根据超弱光纤的应变导致反射光波长改变的原理进行测量,验证了所提计算方法的有效性。最后,针对工程中的导线选型问题,对不同导线进行分层应力计算,为工程设计提供理论参考。 展开更多
关键词 钢芯铝绞线 导线选型 股丝应力 分层应力
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扩径导线在张拉载荷下的股线分层应力计算 被引量:6
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作者 董玉明 万建成 +3 位作者 王孟 司佳钧 刘龙 杨光甫 《电力科学与工程》 2015年第7期65-69,共5页
研究扩径导线分层应力计算,能够为扩径导线的应用提供技术支持。考虑扩径导线的几何特征,对扩径导线的分层应力计算进行了理论分析,推导了扩径导线分层应力计算的理论公式;建立了扩径导线的有限元模型,考虑股线间的接触非线性,对张拉载... 研究扩径导线分层应力计算,能够为扩径导线的应用提供技术支持。考虑扩径导线的几何特征,对扩径导线的分层应力计算进行了理论分析,推导了扩径导线分层应力计算的理论公式;建立了扩径导线的有限元模型,考虑股线间的接触非线性,对张拉载荷工况的扩径导线进行了分析;将理论计算与有限元仿真计算的结果进行了对比研究。研究结果表明:张拉载荷下扩径导线分层应力计算的理论公式与有限元结果的对比基本吻合;张拉载荷作用下,扩径导线各绞层股线所受轴向拉力从内向外逐渐减小,钢芯所受轴向应力相对较大,铝绞层所受轴向应力较小。 展开更多
关键词 扩径导线 分层应力计算 张拉载荷 有限元
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层状地壳的等效力学模量和分层应力
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作者 武红岭 《地球学报(中国地质科学院院报)》 CSCD 北大核心 1999年第3期225-231,共7页
针对地球动力学研究中的板壳力学模型的分层问题,根据等效原则, 给出了用各分层弹性参数和厚度表示的中性面位置、折合抗弯刚度和等效弹性参数。结合实际地壳受横向和侧向力作用时产生的弯曲形变和应力,具体介绍了用这种折算模量的... 针对地球动力学研究中的板壳力学模型的分层问题,根据等效原则, 给出了用各分层弹性参数和厚度表示的中性面位置、折合抗弯刚度和等效弹性参数。结合实际地壳受横向和侧向力作用时产生的弯曲形变和应力,具体介绍了用这种折算模量的方法去求解地壳中的应力、应变状态, 并通过比较等效应力与各分层应力的差异, 阐明了岩石力学性质的不同对各圈层应力的影响作用。研究进一步表明,来自地壳深部的垂直向上的力是造成上部地壳伸展类构造的重要因素之一。 展开更多
关键词 层状地壳 等效模量 等效力学模量 分层应力
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钢芯铝绞线在张力与温度共同作用下的分层应力 被引量:1
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作者 豆云龙 包华 +2 位作者 邵汉杰 兰志文 张盛强 《南昌大学学报(工科版)》 CAS 2021年第4期341-346,共6页
通过理论推导得到钢芯铝绞线在温度和张力共同作用下,分层应力计算公式;同时以某实际工程为例,在有限元软件中通过仿真分析得到各层应力的有限元仿真值;有限元仿真值与理论值进行对比,二者误差在5%以内,满足实际工程要求。研究表明仅在... 通过理论推导得到钢芯铝绞线在温度和张力共同作用下,分层应力计算公式;同时以某实际工程为例,在有限元软件中通过仿真分析得到各层应力的有限元仿真值;有限元仿真值与理论值进行对比,二者误差在5%以内,满足实际工程要求。研究表明仅在张力作用下,钢芯铝绞线轴向应力会出现明显的分层效应。钢芯铝绞线中钢芯层承担的应力明显大于铝股层,约为铝股的3~4倍;在张力和温度共同作用下,导线运行张力随着温度的升高而减小;同时随着温度升高,钢芯层应力在增大,铝股层应力在减小。 展开更多
关键词 钢芯铝绞线 应力分层效应 温度 张力 有限元仿真
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煤层分层地应力预测模型研究 被引量:11
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作者 张玉亭 《非常规油气》 2023年第2期115-120,共6页
利用常规组合弹簧地应力预测模型计算得到的煤层等软硬交互地层地应力数据精度较差,不能满足煤层水力压裂以及钻完井方案设计煤层气开发需要。为了进一步提高模型预测精度,分析了常规组合弹簧模型预测精度差的原因,认为主要是由于未考... 利用常规组合弹簧地应力预测模型计算得到的煤层等软硬交互地层地应力数据精度较差,不能满足煤层水力压裂以及钻完井方案设计煤层气开发需要。为了进一步提高模型预测精度,分析了常规组合弹簧模型预测精度差的原因,认为主要是由于未考虑煤岩和常规砂泥岩在岩石流变特性方面的巨大差异造成的,因此引入岩石黏性系数对组合弹簧模型进行修正,得到了考虑岩石流变性的地应力预测新模型并提出了应用方法,同时结合现场数据进行了实例验证和煤层分层地应力特征正演分析。研究表明:1)相比于传统的组合弹簧模型,新模型的预测精度更高,能更有效地指导煤层钻完井和压裂设计及施工;2)在地质构造运动沉寂期,受到岩石流变性影响,煤层及隔夹层水平地应力随着时间而逐渐下降,但是下降速度不同,进而导致煤层分层水平地应力特征和层内水平地应力特征随时间发生变化,层间地应力之差甚至可能发生反转。该认识能够为当前煤层气开发中遇到的复杂分层和层内地应力现象分析提供新的视角。 展开更多
关键词 煤层分层应力 预测模型 岩石流变性 应力松弛 规律分析
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分层地应力方法在薄互层低渗油藏大型压裂设计中的应用 被引量:12
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作者 刘钦节 闫相祯 杨秀娟 《石油钻采工艺》 CAS CSCD 北大核心 2009年第4期83-88,93,共7页
对薄互低渗油藏实施水力压裂改造时经常出现缝高难以控制、滤失过大、压后效果差等问题。针对薄互低渗油藏特有的地质特点,根据三维分层地应力方法原理利用声波、密度等常规测井资料获取了薄互低渗油藏地应力及裂缝连续分布剖面。用数... 对薄互低渗油藏实施水力压裂改造时经常出现缝高难以控制、滤失过大、压后效果差等问题。针对薄互低渗油藏特有的地质特点,根据三维分层地应力方法原理利用声波、密度等常规测井资料获取了薄互低渗油藏地应力及裂缝连续分布剖面。用数值方法研究了此类油藏压裂过程中地应力及天然裂缝分布特征对压裂缝形态的影响规律,结果发现地应力及天然裂缝对压裂缝的高度、长度及宽度都具有直接控制作用,基于此提出了突出地应力和裂缝作用的薄互低渗油藏大型压裂设计方法。对胜利油田某油区C1井的实际资料进行研究分析,并据此实施了大型压裂设计,效果较好。 展开更多
关键词 分层应力 裂缝 薄互层 低渗透 大型压裂
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分层地应力描述技术及应用 被引量:8
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作者 闫治涛 杨斌 +1 位作者 李行船 杜宝坛 《油气地质与采收率》 CAS CSCD 2004年第1期63-65,共3页
地应力对石油勘探开发的全过程都有重要影响,压裂、注水参数的选择同样受其影响。在全三维压裂设计软件的应用过程中,由于缺乏油藏分层应力数据的计算,压裂设计软件往往难以发挥其优势,如何描述地应力和地应力在压裂实践中的应用也一直... 地应力对石油勘探开发的全过程都有重要影响,压裂、注水参数的选择同样受其影响。在全三维压裂设计软件的应用过程中,由于缺乏油藏分层应力数据的计算,压裂设计软件往往难以发挥其优势,如何描述地应力和地应力在压裂实践中的应用也一直困扰着人们。该文基于广义虎克定律,建立了适用于水力压裂裂缝为垂直裂缝的地应力计算模式。该技术已应用于水力压裂参数设计和确定极限注水压力,取得了较好的效果。 展开更多
关键词 分层应力 石油勘探 水力压裂 极限注水压力 限流压裂 低渗透油气田
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考虑温度场的架空钢芯铝绞线线股应力研究 被引量:7
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作者 张猛 张玉莹 +1 位作者 赵桂峰 肖宇 《郑州大学学报(工学版)》 CAS 北大核心 2018年第4期7-11,35,共6页
准确了解钢芯铝绞线在温度场中各层线股的应力分布,可为架空导线的安全设计和抗疲劳分析提供理论依据.根据钢芯铝绞线材料性能和协同变形特点,采用理论分析和有限元模拟研究导线线股应力和温度之间的关系,分析了导线平均温度和径向温差... 准确了解钢芯铝绞线在温度场中各层线股的应力分布,可为架空导线的安全设计和抗疲劳分析提供理论依据.根据钢芯铝绞线材料性能和协同变形特点,采用理论分析和有限元模拟研究导线线股应力和温度之间的关系,分析了导线平均温度和径向温差对最外层铝股应力的影响.结果表明,不考虑径向温差时,铝股应力随着温度的升高而减小,钢芯应力随着温度的升高而增大;考虑径向温差时,外层铝股的应力随着温差的增大而增大,内部铝股和钢芯的应力随着温差的增大而减小,温差达到20℃时,外层铝股应力增加49%左右. 展开更多
关键词 钢芯铝绞线 有限元 温度场 径向温差 分层应力
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架空导线温度应力场耦合数值分析 被引量:2
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作者 肖凯 刘永斗 +2 位作者 李鹏云 古泉 陈志为 《广东电力》 2015年第11期97-102,共6页
准确分析架空导线在运营条件下的温度场和应力场耦合问题对于保证导线的强度安全和弧垂安全距离具有重要意义,为此,提出一种架空导线细观温度场和应力场耦合的新型数值求解方法,即先利用有限元法求解考虑孔隙的细观温度场,再利用内外力... 准确分析架空导线在运营条件下的温度场和应力场耦合问题对于保证导线的强度安全和弧垂安全距离具有重要意义,为此,提出一种架空导线细观温度场和应力场耦合的新型数值求解方法,即先利用有限元法求解考虑孔隙的细观温度场,再利用内外力平衡和变形协调关系求解导线的分层应力,充分考虑了导线由于层间挤压、泊松效应以及温度改变所引起的横向变形。以铝包钢芯铝绞线JL/LB1A-300/50为例,验证了算法的正确性,研究了横向变形对计算结果的影响和敏感性。 展开更多
关键词 架空导线 细观温度场 分层应力 温度场 应力场耦合 横向变形 敏感性分析
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复合材料板件热分层分析及试验验证 被引量:1
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作者 冉治国 燕瑛 +3 位作者 李剑峰 从强 陈海峰 匡乃航 《北京航空航天大学学报》 EI CAS CSCD 北大核心 2014年第6期819-823,共5页
针对飞行器用复合材料层合板件的热应力分层问题,进行了试验与数值模拟方面的研究.采用双线性内聚力单元用于模拟层合复合材料的分层现象;通过二次交互应力准则判断复合材料刚度降阶的起始点;并同时使用幂指数准则作为材料在混合破坏模... 针对飞行器用复合材料层合板件的热应力分层问题,进行了试验与数值模拟方面的研究.采用双线性内聚力单元用于模拟层合复合材料的分层现象;通过二次交互应力准则判断复合材料刚度降阶的起始点;并同时使用幂指数准则作为材料在混合破坏模式下的失效准则.数值模型中单层复合材料的力学性能和热膨胀性能分别由在高温(70℃)、室温(23℃)、低温(-50℃)环境下的相应测试进行确定.各复合材料层合试验件在仪器DIL-402C中经历了相同的温度变化过程,最大温差相差120℃.试验后发现,对于给定铺层的试验件,其两端中间层发生了层间分层.将数值模拟的结果与试验结果进行对比,对比结果表明数值分析与试验结果吻合良好,由此也可证明此分析方法的可行性与正确性. 展开更多
关键词 复合材料 内聚力单元 应力分层 幂指数准则 混合破坏模式
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非对称多层薄板折算力学模量的讨论 被引量:6
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作者 武红岭 《地质力学学报》 CSCD 1997年第2期24-32,共9页
为使有限单元法中的板壳单元更适合于分析地学问题,本文放弃前人对多层薄板的几何和弹性对称性限制,根据等效原则,重新推导了非对称多层薄板的中性面位置,进而给出了用各分层弹性模量和厚度表示的折合抗弯刚度及弹性模量。
关键词 非对称 多层薄板 折算力学模量 分层应力 地壳
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考虑裂尖塑性区影响的水力压裂缝高计算模型 被引量:15
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作者 李玉伟 龙敏 +2 位作者 汤继周 陈勉 付晓飞 《石油勘探与开发》 SCIE EI CAS CSCD 北大核心 2020年第1期175-185,共11页
为了对水力压裂裂缝高度进行准确预测,针对高应力多分层的复杂地层,基于断裂力学理论分析裂缝扩展过程中裂缝尖端应力集中产生的塑性区分布对缝高扩展的影响,建立水力压裂缝高计算模型并进行求解,通过与其他2种缝高模型(MFEH、FracPro)... 为了对水力压裂裂缝高度进行准确预测,针对高应力多分层的复杂地层,基于断裂力学理论分析裂缝扩展过程中裂缝尖端应力集中产生的塑性区分布对缝高扩展的影响,建立水力压裂缝高计算模型并进行求解,通过与其他2种缝高模型(MFEH、FracPro)计算结果进行对比以验证该模型的准确性。模型实例计算的敏感性分析表明:水力压裂的缝高会呈现阶梯生长的扩展形态,且裂缝缝高越大,阶梯生长的现象越明显;地应力对裂缝缝高的生长起主要的控制作用,地层岩石断裂韧性只在一定程度上对缝高生长有抑制作用;压裂液密度的增大有利于裂缝下尖端的扩展。 展开更多
关键词 水力压裂 裂缝高度 裂尖塑性区 断裂韧性 应力分层地层
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Geostress measurements near fault areas using borehole stress-relief method 被引量:5
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作者 黄明清 吴爱祥 +1 位作者 王贻明 韩斌 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第11期3660-3665,共6页
To minimize negative effects of geostress distribution on mining safety near the fault areas, the UPM40 triaxial geostress testing system was introduced to conduct in-situ geostress measurements at three sites and nin... To minimize negative effects of geostress distribution on mining safety near the fault areas, the UPM40 triaxial geostress testing system was introduced to conduct in-situ geostress measurements at three sites and nine points by the borehole stress-relief method. The results of strain?confining pressure curves show that rock masses at the three measuring sites exhibit comprehensive linear elasticity in spite of various fissures or cracks within rocks. Horizontal and vertical stress components distribute discrepantly near the fault areas, and the maximum lateral pressure coefficient is as high as 6.15. The maximum principle stress ranges from 8.01 to 14.93 MPa, and stress directions are in the range of N78.07°W?N17.55°W. Geostresses near fault areas are dominated by the horizontal tectonic stresses, while the lower values, compared to those under similar geological conditions are due to stress release by the fault. Additionally, the fault and shear stress nearby are partially responsible for asymmetric elongation and southwesterly migration of orebodies. 展开更多
关键词 fault areas geostress distribution borehole stress-relief method lateral pressure coefficient horizontal tectonic stress
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Application of laminated vierendeel truss in high-position transfer story structure 被引量:8
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作者 戴国亮 童小东 +1 位作者 黄祥海 梁书亭 《Journal of Southeast University(English Edition)》 EI CAS 2005年第2期184-190,共7页
To meet the demands for large space and flexible compartmentation ofbuildings, laminated vierendeel trasses are adopted in high-position transfer story structures.First the bearing characteristics are analyzed, in whi... To meet the demands for large space and flexible compartmentation ofbuildings, laminated vierendeel trasses are adopted in high-position transfer story structures.First the bearing characteristics are analyzed, in which reasonable stiffness ratio of the upperchord, middle chord, and lower chord is derived. Then combined with an actual engineering model (1:8similar ratio), the static loading and pseudo-dynamic tests of two models for laminated vierendeeltrass used in transfer story structures are conducted, in which one model adopts reinforcedconcrete, and the other adopts prestressed concrete and shape steel concrete. Seismic behaviors areanalyzed, including inter-story displacement, base shear-displacement skeleton curves, andequivalent viscosity-damping curves. A program is programmed to carry out the elasto-plastic dynamicanalysis, and displacement time-history curves of the two models are derived. The test and analysisresults show that the laminated vierendeel trass with prestressed concrete and shape steel concretehas excellent seismic behaviors. It can solve the disadvantages of laminated vierendeel trussesused in transfer story structures. Finally, some design suggestions are put forward, which can bereferenced by similar engineering. 展开更多
关键词 laminated vierendeel trass steel concrete transfer story structure prestressed concrete elastro-plasticity analysis
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Cracked elastic substrate strip with functionally graded coating under thermal-mechanical loading
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作者 苗福生 刘俊俏 李星 《Journal of Southeast University(English Edition)》 EI CAS 2012年第4期451-456,共6页
This paper investigates the functionally graded coating bonded to an elastic strip with a crack under thermal- mechanical loading. Considering some new boundary conditions, it is assumed that the temperature drop acro... This paper investigates the functionally graded coating bonded to an elastic strip with a crack under thermal- mechanical loading. Considering some new boundary conditions, it is assumed that the temperature drop across the crack surface is the result of the thermal conductivity index which controls heat conduction through the crack region. By the Fourier transforms, the thermal-elastic mixed boundary value problems are reduced to a system of singular integral equations which can be approximately solved by applying the Chebyshev polynomials. The numerical computation methods for the temperature, the displacement field and the thermal stress intensity factors (TSIFs) are presented. The normal temperature distributions (NTD) with different parameters along the crack surface are analyzed by numerical examples. The influence of the crack position and the thermal-elastic non- homogeneous parameters on the TSIFs of modes I and 11 at the crack tip is presented. Results show that the variation of the thickness of the graded coating has a significant effect on the temperature jump across the crack surfaces when keeping the thickness of the substrate constant, and the thickness of functionally graded material (FGM) coating has a significant effect on the crack in the substrate. The results can be expected to be used for the purpose of gaining better understanding of the thermal-mechanical behavior of graded coatings. 展开更多
关键词 thermal-mechanical loading singular integral equations functionally graded coating thermal stress intensity factors (TSIFs)
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Patterns governing distribution of surrounding-rock stress and strata behaviors of fully-mechanized caving faces 被引量:3
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作者 谢广祥 刘全明 +1 位作者 查文华 华心祝 《Journal of Coal Science & Engineering(China)》 2004年第1期5-8,共4页
By employing numerical modeling, similar material simulation and comprehen-sive field observation, investigations were made and patterns were obtained governing surrounding-rock stress distribution and strata behavior... By employing numerical modeling, similar material simulation and comprehen-sive field observation, investigations were made and patterns were obtained governing surrounding-rock stress distribution and strata behaviors. It shows that patterns governing displacement of FMC roadway surrounding rocks and those governing deformation of supports are basically the same along the strike, but the displacements vary greatly. The front stresses affect greater areas than the lateral stresses and their limit widths of equilib-rium zones and K are almost similar. The stress transmits very deep. Our findings offer scientific basis on which to determine parameters for coal pillar retaining and for roadway out-laying, thus increasing the recovery ratio and improving the maintenance of roadway. 展开更多
关键词 fully-mechanized caving face (FMC faces) stress surrounding-rock stress
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Prediction and safety analysis of additional vertical stress within a shaft wall in an extra-thick alluvium 被引量:7
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作者 WANG Yansen ZHANG Chi +1 位作者 XUE Libing HUANG Xinggen 《Mining Science and Technology》 EI CAS 2010年第3期350-356,共7页
An alluvium with a sandy aquifer at the bottom,but lacking an effective impermeable layer between the sandy aquifer and bedrock is referred to as a special alluvial stratum.Impacted by the drainage of the aquifer due ... An alluvium with a sandy aquifer at the bottom,but lacking an effective impermeable layer between the sandy aquifer and bedrock is referred to as a special alluvial stratum.Impacted by the drainage of the aquifer due to mining activities,a shaft wall in this special alluvial stratum will be subject to a downward load by an additional vertical force which must be taken into consideration in the design of the shaft wall.The complexity of interaction between shaft wall and the surrounding walls makes it extremely difficult to determine this additional vertical force.For a particular shaft wall in an extra-thick alluvium and assuming that the friction coefficient between shaft wall and stratum does not change with depth,an analysis of a numerical simulation of the stress within the shaft wall has been carried out.Growth and size of the additional vertical stress have been obtained,based on specific values of the friction coefficient,the modulus of elasticity of the drainage layer and the thickness of the drainage layer.Subsequently, the safety of shaft walls with different structural types was studied and a more suitable structural design,providing an important basis for the design of shaft walls,is promoted. 展开更多
关键词 extra-thick alluvium shaft wall additional vertical stress additional vertical force numerical analysis
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Analysis of the dialectical relation between top coal caving and coal-gas outbtu rst 被引量:3
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作者 MENG Xian-zheng XIAYongjun +1 位作者 TANG Bing ZHANG Yong-jiang 《Journal of Coal Science & Engineering(China)》 2009年第2期181-187,共7页
According to the different engineering mechanical states of top coal caving andnormal stoping of gaseous loose thick coal seams,the dialectical relation between thiscaving method and dynamic disasters was analyzed by ... According to the different engineering mechanical states of top coal caving andnormal stoping of gaseous loose thick coal seams,the dialectical relation between thiscaving method and dynamic disasters was analyzed by simulating the change of stressstates in the process of top coal initial caving with different mining and caving ratios basedon the ANSYS10.0.The variation of elastic energy and methane expansion energy duringfirst top coal caving was analyzed by first weighting and periodic weighting and combiningwith coal stress and deformation distribution of top coal normal stoping as well as positiveand negative examples in top coal caving of outburst coal seam.The research shows thatthe outburst risk increases along with the increase of the caving ratio in the initial miningstage.In the period of normal stoping,when the mining and caving ratio is smaller than1:3 and hard and massive overlying strata do not exist (periodic weighting is not obvious),it is beneficial to control ground stress leading type outburst.Thus,it is unreasonable toprohibit top coal caving in dangerous and outburst prone areas. 展开更多
关键词 coal and gas outburst top coal initial caving mining and caving ratio ground stress
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Influence of mining thickness to the mechanical characteristics of gateways at FMTC faces 被引量:1
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作者 谢广祥 王磊 《Journal of Coal Science & Engineering(China)》 2008年第1期1-5,共5页
To make a better understanding of the mechanical characteristics of the surrounding rocks in the tailentry and headentry with different coal seam thickness at fully mechanized top-coal caving face (FMTC face), the s... To make a better understanding of the mechanical characteristics of the surrounding rocks in the tailentry and headentry with different coal seam thickness at fully mechanized top-coal caving face (FMTC face), the stress transition and displacement around the periphery of the gateways with different coal thicknesses were investigated in details by means of in situ measurement and 3-D numerical simulation. The research shows that the stresses decrease in the two spallings of the headentry and floor at goal with the increase in mining thickness. The roof pressure in the gates does not change obviously with the coal thickness, but the thicker the coal seam is, the farther the maximum stress will apply to the coal rib at the working face. The vertical stress is higher than the horizontal stress at two spallings of the gate, while its horizontal stress is higher than the vertical stress at the roof. The relative displacement between the roof and floor and the two spallings in the gateways increases gradually with the increase in coal seam thickness in a definite range in front of the face. Near the mining face, the stress decreases in the surrounding rock of the gates, while the deformation appears the most intensive. It is proposed that the support concept to the tailentry and headentry should be changed from loading control to deformation control. 展开更多
关键词 FMTC face coal seam thickness GATEWAYS STRESS DISPLACEMENT
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Molecular dynamics simulations of strain-dependent thermal conductivity of single-layer black phosphorus 被引量:2
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作者 Wu Junwei Tao Yi +2 位作者 Chen Chen Chen Yuewen Chen Yunfei 《Journal of Southeast University(English Edition)》 EI CAS 2018年第1期43-47,共5页
Classical molecular dynamics(MD)simulations ae performed to investigate the effects of mechanical strain on the thermal conductivity of single-layer black phosphorus(SLBP)nanoribbons along different directions at room... Classical molecular dynamics(MD)simulations ae performed to investigate the effects of mechanical strain on the thermal conductivity of single-layer black phosphorus(SLBP)nanoribbons along different directions at room temperature.The results show that the tensile strain afects the thermal conductivity of nanoribbons by changing thephonon density of state(DOS)and mean free path(M FP).The thermal conductivity shows a sharp enhancement with the tensile strain applied along the armchai diection,while it increases slowly with the strain applied along the zigzag diection.This phenomenon cm be mainly explained by effects of the phonon DOS and MFP.The increasing strain along the armchai direction weakens DOS and strengthens MFP clearly.However,when it comes to the increasing strain along the zigzag deection'DOS enliances significantly while MFP decreases slightly.The findings explore the relationship between the tensile strain and the thermal conductivity reasonably and can provide a reliable method to estimate the MFP of black phosphorus. 展开更多
关键词 molecular dynamics smgle-layer black phosphorus STRAIN thermal conductivity phonon density of state mean free path
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