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基于二阶功准则的NPR锚索支护效果研究 被引量:2
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作者 胡杰 何满潮 +2 位作者 李兆华 冯吉利 肖勇杰 《岩土工程学报》 EI CAS CSCD 北大核心 2021年第10期1870-1877,I0005,共9页
NPR锚索因其具有恒定工作阻力和较大变形量的特性,已广泛应用于巷道的加固和监测预警中。为了研究NPR锚索在露天矿山边坡中的支护效果,首先基于有限差分软件FLAC^(3D)中的锚索单元开发出NPR锚索单元,并通过数值拉伸试验验证了NPR锚索比... NPR锚索因其具有恒定工作阻力和较大变形量的特性,已广泛应用于巷道的加固和监测预警中。为了研究NPR锚索在露天矿山边坡中的支护效果,首先基于有限差分软件FLAC^(3D)中的锚索单元开发出NPR锚索单元,并通过数值拉伸试验验证了NPR锚索比普通锚索具有更优异的吸能特性;之后引入二阶功作为边坡稳定性评价准则,并将其植入显式动力学算法中,详细讨论了其合理性和可靠性;最后,以浩尧尔忽洞金矿西采场北帮开挖诱发的滑坡为研究对象,对现有普通矿用锚索和NPR锚索支护体系下的边坡稳定性进行对比分析。根据数值模拟结果可知,NPR锚索支护体系下的边坡稳定性明显优于普通矿用锚索。 展开更多
关键词 NPR锚索 安全系数 边坡稳定性 二阶功 失稳准则
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水–岩及风化作用下层状炭质板岩巴西劈裂试验研究 被引量:7
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作者 李二强 冯吉利 +2 位作者 张龙飞 张洪昌 朱天宇 《岩土工程学报》 EI CAS CSCD 北大核心 2021年第2期329-337,共9页
横观各向同性层状板岩在地质环境及施工裸露后形成的水–岩和自然风化作用下,其物理力学性质将发生退化,由此常引起岩土隧道、边坡等工程产生抗拉失稳破坏。以甘肃岷县木寨岭隧道炭质板岩为研究对象,对其开展即时烘干试样(即试样加工后... 横观各向同性层状板岩在地质环境及施工裸露后形成的水–岩和自然风化作用下,其物理力学性质将发生退化,由此常引起岩土隧道、边坡等工程产生抗拉失稳破坏。以甘肃岷县木寨岭隧道炭质板岩为研究对象,对其开展即时烘干试样(即试样加工后烘干处理)和静置风化试样(加工后室内常温通风放置60d)巴西劈裂试验,分析了两种条件下炭质板岩的抗拉力学性能。结果表明:两种炭质板岩巴西劈裂试验均表现为脆性破坏,但力学响应及峰值荷载差异极大;炭质板岩抗拉强度均受层理影响显著,但即时烘干试样和静置风化试样的劈裂破坏形态受层理影响程度不同;以即时烘干试样为基础,静置风化试样软化系数为0.11~0.13,体现了水岩作用及其静置风化对岩样具有显著劣化效应,但对层理形成的横观各向同性抗拉性能影响不大。此外,借助SEM对水岩静置风化机理进行分析,具体为水侵入后形成物理化学反应改变矿物微观成分、结构进而结合风化作用表现为矿物骨架承载的累计劣化损伤。 展开更多
关键词 炭质板岩 层理 水–岩作用 风化 抗拉强度 破坏模式 劣化机理
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Triggering mechanism and dynamic process of water-rock flow in Nanfen waste dump in 2010 被引量:2
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作者 CAO Chun-hui feng ji-li TAO Zhi-gang 《Journal of Mountain Science》 SCIE CSCD 2021年第10期2565-2579,共15页
Water-rock flow is a kind of debris flow with more coarse particles and low viscosity, which occurs in many areas of the world. In this work, the water-rock flow that occurred on May 24, 2010, at Nanfen’s open-pit mi... Water-rock flow is a kind of debris flow with more coarse particles and low viscosity, which occurs in many areas of the world. In this work, the water-rock flow that occurred on May 24, 2010, at Nanfen’s open-pit mine of China was investigated by combining field investigation, meteorological and hydrological survey with numerical simulation to understand its triggering mechanism and dynamic process. The field data shows that the short-term high-intensity rainfall is the most direct inducement to trigger water-rock flow in the waste dump. The loose shallow gravel soil and the V-shaped valley with a certain slope provide the necessary conditions of the occurrence of water-rock flow in the waste dump. Moreover, the possibility criterion of water-rock flow is presented by analyzing the historical rainfall data. In addition, the smoothed particle hydrodynamics(SPH) method was employed to simulate the waterrock flow under the conditions of Newtonian fluid with uniform distribution of water and coarse-grained materials. The simulating results show that the flow distance, velocity, shape, and deposition profile of water-rock flow are in good agreement with the field observation. The present work is beneficial to the risk assessment and mitigation design of water-rock flow disaster in the waste dump. 展开更多
关键词 Water-rock flow Waste dump Triggering mechanism Smoothed particle hydrodynamics Rainfall intensity
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3D deformation effect and optimal excavated design of surface mine 被引量:2
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作者 WANG Shu-ren feng ji-li 《Journal of Coal Science & Engineering(China)》 2009年第4期361-366,共6页
The three-dimensional (3D) deformation effect of the slope engineering under the step-by-step excavation for the Antaibao surface mine was analyzed using the FLAC^3D technique. An optimal excavated scheme with a rel... The three-dimensional (3D) deformation effect of the slope engineering under the step-by-step excavation for the Antaibao surface mine was analyzed using the FLAC^3D technique. An optimal excavated scheme with a relatively steeper slope angle of 47° instead of 30° was successfully implemented at the west wall in the geological section 73200 of the mine area, where the 3D effect of the nonlinear large deformation of the slope was taken into account. Based on the above research conclusion, put forward the countermeasures of shortening mining length, excavating by different regions, timely foot backfilling to protect the excavated slope, and monitoring and feedback adjustment by studying the nonlinear effect. The results show that these countermeasures are effective in controlling maximum deformation and increasing the stability of the slope. 展开更多
关键词 surface mine slope engineering 3D deformation effect mining design FLAC^3D
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