煤矿安全2024，Vol.55Issue(8)：146-152,7.DOI:10.13347/j.cnki.mkaq.20240619
侧向正交开采扰动边坡变形演变机理与破坏模式研究
Study on deformation evolution mechanism and failure mode of disturbed slope in lateral orthogonal mining
摘要
Abstract
In order to further study the deformation evolution mechanism and failure mode of slope under lateral orthogonal mining disturbance,based on the background of mining disturbance slope in mountainous area,combined with field investigation,FLAC3D numerical simulation software was used to construct a three-dimensional geological model of mining slope,and the variation law of stress field and displacement field of slope at different advancing positions of working face was analyzed.Combined with the analys-is of GNSS monitoring data,three deformation evolution stages and failure modes of the disturbed slope of lateral orthogonal min-ing are proposed.The results show that under the disturbance of lateral orthogonal mining,the concentrated stress of the free surface of the slope is gradually released,the deformation disturbance of the surface is generated before the lower rock mass,and the non-uniform shear deformation along the slope direction is generated at the top of the slope,and the non-continuous failure occurs.When the horizontal distance between the working face and the slope is 50-55 m,the deformation amount mutates,the rock mass at the up-per edge of the slope deforms plastically,and the tensile cracks extending intermittently along the slope trend appear on the top of the slope,which weakens the range of the surface affected by mining disturbance.When the working face passes through the slope sec-tion and the horizontal distance between the two is beyond 120-170 m,it enters the stage of deformation recession and the deforma-tion rate slows down.At this time,the deformation increment of the slope in the vertical direction is greater than the horizontal de-formation increment.The overlying rock mass of the crack produces the extrusion effect pointing to the free surface,and the crack gradually closes;the slope generally presents a non-uniform shear-cracking-closing deformation and failure mode.关键词
采动边坡/侧向正交开采/边坡稳定性/边坡变形演变机理/边坡破坏模式Key words
mining slope/lateral orthogonal mining/slope stability/slope deformation evolution mechanism/slope failure mode分类
矿业与冶金引用本文复制引用
念熙博,李宏杰,李伟,闫杰,郭夏飞,贾正昭..侧向正交开采扰动边坡变形演变机理与破坏模式研究[J].煤矿安全,2024,55(8):146-152,7.基金项目
煤炭科学技术研究院有限公司技术创新基金资助项目(2023CX-Ⅱ-05) （2023CX-Ⅱ-05）
