首页|开挖作用下滑剪破坏下盘边坡扰动范围计算及稳定性评价方法

开挖作用下滑剪破坏下盘边坡扰动范围计算及稳定性评价方法

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滑剪破坏型下盘边坡是矿山工程中经常出现的一种顺层边坡，具有突发性强、破坏范围广的特点。如何快速、准确地确定开挖塑性扰动区并评估其稳定性对边坡安全控制至关重要。本文首先通过数值模拟揭示了该类边坡的破坏模式和特征。然后，根据其破坏模式，建立了描述开挖扰动区的数学方程。最后，提出了一种计算下盘边坡开挖扰动区和稳定性的力学截断新方法(MTM)。主要结果有，MTM方法考虑岩体单轴抗压强度，计算过程无需一般极限平衡方法需要的多次循环迭代，计算过程简便。MTM方法可以准确地表征扰动区，计算得到的极限边坡高度、扰动厚度和安全系数与数值模拟结果较吻合，且评价结果比数值模拟更安全。扰动区的最大厚度决定了锚索锚固端的深度，分区是为了指明加固的重点范围。该方法为下盘边坡的工程施工和监测提供指导。
Disturbed zone calculation and stability evaluation method of footwall slope with slip-shear failure under excavation
The slip-shear failure type of footwall slope is a type of beding slope that often appears in mining engineering,which has the characteristics of strong suddenness and extensive failure range.How to quickly and accurately define the plastic disturbed zone of excavation and evaluate its stability is vital for safety control.In this work,the failure mode and characteristics of this type of slope are first revealed by numerical simulation tests.Then,according to the failure mode of the slope,considering the uniaxial compressive strength of the rock mass,the mathematical equation describing the excavation disturbed zone is established.Finally,a new mechanical truncation method(MTM)is proposed to calculate the excavation disturbed zone and stability of the footwall slope.It is found that the MTM can accurately characterize the disturbed zone.The calculated limit cutting depth,disturbance thickness,and safety factor are in good agreement with the numerical simulation results,and the evaluation results are safer than numerical simulations.The maximum thickness of the disturbed zone determines the depth of the anchor end of the anchor cable.The disturbed zone indicates the critical area for reinforcement and provides engineering construction and monitoring guidance for the footwall slope.

footwall slopeslip-shear failurefailure mechanismmechanical truncation method(MTM)disturbed zoneanalysis of stability

秦辉、汤华、尹小涛、程谞

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State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China

University of Chinese Academy of Sciences,Beijing 100049,China

下盘边坡 滑剪破坏 失效机制 力学截断法 扰动区 稳定性分析

Key Research and Development Program of Yunnan,China国家自然科学基金Science and Technology Innovation and Demonstration of Yunnan Provincial Department of Transportation,ChinaScience and Technology Innovation and Demonstration of Yunnan Provincial Department of Transportation,China

202303AA08001051779250[2020]74[2020]98

2024

10.1007/s11771-023-5511-5

中南大学学报(英文版)
中南大学

中南大学学报(英文版)

CSTPCDEI
影响因子：0.47
ISSN：2095-2899
年,卷(期)：2024.31(2)
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