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高碾压混凝土重力坝防渗结构型式研究 被引量:10
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作者 朱岳明 匡峰 +4 位作者 冯树荣 孙君森 王红斌 欧红光 狄原涪 《水力发电》 北大核心 2003年第11期20-25,共6页
以龙滩高碾压混凝土重力坝为依托,分别对该坝上游面采用变态混凝土与二级配碾压混凝土组合防渗结构方案,以及另再增加坝底部半截高钢筋混凝土面板组合防渗结构方案或增加坝底部半截高完全不透水的不锈钢钢面板组合防渗结构方案等的防渗... 以龙滩高碾压混凝土重力坝为依托,分别对该坝上游面采用变态混凝土与二级配碾压混凝土组合防渗结构方案,以及另再增加坝底部半截高钢筋混凝土面板组合防渗结构方案或增加坝底部半截高完全不透水的不锈钢钢面板组合防渗结构方案等的防渗效果进行了分析研究;同时研究了坝体和坝基的主要渗流特性和排水幕的渗控作用。研究发现变态混凝土和二级配碾压混凝土的组合防渗结构型式可行,优势明显,能满足大坝渗控要求,但其中也可能存在某些问题,需采用若干相应的工程辅助措施加以解决。 展开更多
关键词 高碾压混凝土重力坝 防渗结构 渗控方案 变态混凝土 二级配碾压混凝土 层缝面 龙滩水电站
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200m级RCC重力坝优选渗控设计方案研究 被引量:3
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作者 崔皓东 朱岳明 《水利学报》 EI CSCD 北大核心 2007年第S1期184-188,共5页
寻求合适的渗控措施以解决坝的渗流问题是高碾压混凝土坝技术发展的关键。以光照水电站200米级RCC重力坝为依托,利用节点虚流量全域迭代法和改进的排水孔模拟技术,对该坝上游面拟采用变态混凝土与二级配碾压混凝上组合防渗结构方案防渗... 寻求合适的渗控措施以解决坝的渗流问题是高碾压混凝土坝技术发展的关键。以光照水电站200米级RCC重力坝为依托,利用节点虚流量全域迭代法和改进的排水孔模拟技术,对该坝上游面拟采用变态混凝土与二级配碾压混凝上组合防渗结构方案防渗效果进行了分析;研究了坝体可能出现的裂缝和排水孔幕的渗控作用。研究表明:该防渗型式可行,优势明显,能满足200米级RCC重力坝渗控要求,综合分析后提出了优选方案。 展开更多
关键词 RCC重力坝 层缝面 渗控方案 变态混凝上 有限元 光照水电站
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碾压混凝土坝渗流场与应力场耦合分析的数学模型 被引量:17
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作者 柴军瑞 仵彦卿 《水利学报》 EI CSCD 北大核心 2000年第9期33-36,43,共5页
从碾压混凝土坝的渗透特性出发 ,分析了碾压混凝土坝层 (缝 )面渗流与坝体应力相互影响的耦合机理 ,层 (缝 )面渗流向层 (缝 )壁面施加法向渗透压力和切向拖曳力来影响坝体应力 ,坝体应力改变层 (缝 )面的等效隙宽来影响渗流 ,进而提出... 从碾压混凝土坝的渗透特性出发 ,分析了碾压混凝土坝层 (缝 )面渗流与坝体应力相互影响的耦合机理 ,层 (缝 )面渗流向层 (缝 )壁面施加法向渗透压力和切向拖曳力来影响坝体应力 ,坝体应力改变层 (缝 )面的等效隙宽来影响渗流 ,进而提出了碾压混凝土坝渗流场与应力场耦合分析的数学模型 ,讨论了该耦合模型的有限元数值解法 ,并给出了工程应用实例 .由计算实例可以看出 ,耦合作用使坝体渗流场发生变化 ,并且使坝体应力增大 。 展开更多
关键词 碾压混凝土坝 ()渗流 渗流场 应力场
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Using structure restoration maps to comprehensively identify potential faults and fractures in compressional structures 被引量:5
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作者 欧成华 陈伟 李朝纯 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第3期677-684,共8页
Faults and fractures of multiple scales are frequently induced and generated in compressional structural system. Comprehensive identification of these potential faults and fractures that cannot be distinguished direct... Faults and fractures of multiple scales are frequently induced and generated in compressional structural system. Comprehensive identification of these potential faults and fractures that cannot be distinguished directly from seismic profile of the complex structures is still an unanswered problem. Based on the compressional structural geometry and kinematics theories as well as the structural interpretation from seismic data, a set of techniques is established for the identification of potential faults and fractures in compressional structures. Firstly, three-dimensional(3D) patterns and characteristics of the faults directly interpreted from seismic profile were illustrated by 3D structural model. Then, the unfolding index maps, the principal structural curvature maps, and tectonic stress field maps were obtained from structural restoration. Moreover, potential faults and fractures in compressional structures were quantitatively identified relying on comprehensive analysis of these three maps. Successful identification of the potential faults and fractures in Mishrif limestone formation and in Asmari dolomite formation of Buzurgan anticline in Iraq demonstrates the applicability and reliability of these techniques. 展开更多
关键词 potential fault and fracture comprehensive identification structure restoration maps 3D structural modeling compressional structures
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Research of the electrical anisotropic characteristics of water-conducting fractured zones in coal seams 被引量:7
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作者 Su Ben-Yu Yue Jian-Hua 《Applied Geophysics》 SCIE CSCD 2017年第2期216-224,322,共10页
Water flooding disasters are one of the five natural coal-mining disasters that threaten the lives of coal miners. The main causes of this flooding are water-conducting fractured zones within coal seams. However, when... Water flooding disasters are one of the five natural coal-mining disasters that threaten the lives of coal miners. The main causes of this flooding are water-conducting fractured zones within coal seams. However, when resistivity methods are used to detect water-conducting fractured zones in coal seams, incorrect conclusions can be drawn because of electrical anisotropy within the water-conducting fractured zones. We present, in this paper, a new geo-electrical model based on the geology of water-conducting fractured zones in coal seams. Factors that influence electrical anisotropy were analyzed, including formation water resistivity, porosity, fracture density, and fracture surface roughness, pressure, and dip angle. Numerical simulation was used to evaluate the proposed electrical method. The results demonstrate a closed relationship between the shape of apparent resistivity and the strike and dip of a fracture. Hence, the findings of this paper provide a practical resistivity method for coal-mining production. 展开更多
关键词 water-conducting fractured zones in coal seams coalfield goaf electrical anisotropy surface roughness formation water resistivity formation pressure
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