摘要
以安太堡露天矿西端帮73200地质剖面为工程背景,构建三维长直边坡地质模型和数值模型,应用FLAC3D对边坡工程在分步开挖过程中表现出来的三维变形效应进行了研究,发现随着边坡开挖长度的不同,边坡向临空侧的最大位移呈现出显著的非线性变形响应特征,即在非线性变形曲线中出现一个重要特征点和由该点可以界定的两个差异明显的变形阶段。基于上述研究和对西端帮进行时空步序控制开采技术的优化分析,采用缩短采煤长度,分段开挖,跟进回填,反压护坡,监测反馈,再进行回采的开采模式,不仅缩短了西端帮的暴露时间,而且充分利用边坡开挖的三维变形效应和边坡岩体强度不断衰减的时间效应,达到了改善边坡受力状态、控制边坡变形、提高开挖边坡稳定程度的效果。
After building the line-slope engineering geological model and 3-D computational model for slope geologic section No. 73200 in Antaibao surface mine, this paper analyzed the 3D deformation effect of the slope engineering under step-by-step excavation by using FLAC^3D technique. The results showed that the maximum displacement against the slope presented remarkable nonlinear deformation according to the different excavated length of the slope. There was one characteristic point and two distinct successive phases divided by the characteristic point in the nonlinear deformation response curve. Based on the above researched conclusion and the optimized method to controll mining of time and spatial steps of the west edge slope, the author put forward the countermeasures of shortening mining length, excavating by different regions, timely backfilling foot to protect the excavated slope, monitoring and feedback adjustment by studying the nonlinear effect. These countermeasures not only shortened the exposure time of the slope engineering, but also utilized the slope 3D deformation spatial effect and the time effect of the slope rock strenght reduction constantly, and these countermeasures were good to improve the mechanical state, to control the maximum deformation,and to increase the stabilization of the slope.
出处
《河北科技师范学院学报》
CAS
2008年第3期68-72,共5页
Journal of Hebei Normal University of Science & Technology
关键词
露天煤矿
边坡工程
数值模拟
三维变形效应
工程对策
surface mine
slope engineering
numerical simulation
3-D deformation effect
engineering counter-measures
