摘要
结合室内岩石力学实验,对岩石内聚力、内摩擦角等力学参数进行了统计分析,针对矿山工程现状进行了参数折减,实现了在采空区影响下的边坡稳定性分析。研究结果表明:选取截面边坡平均安全系数为0.75,失稳概率达到99.7%;边坡的失稳概率随着随机参数c、φ均值、变异系数的增大而减小,其中风化围岩带的内摩擦角φ变化对失稳概率的影响较为明显,在进行边坡稳定性分析时应考虑风化围岩带内聚力和内摩擦角力学参数的随机变化,以便更科学合理的进行安全评价。
Combined with indoor rock mechanic experiments, statistical analysis was made for rock＇s cohesion, interior friction angle and other rock mechanics parameters. Parameter reduction was conducted based on the current situation of projects on mine. The stability of side slope under the impact of gob area was analyzed. The results indicate that the average safety coefficient of selected section is 0.75, and instability probability, being up to 99.7%, will decrease with the increasing of mean value and coefficient of variation of the random parameter c, ~p, among which the change in interior friction angle ~p of weathered surrounding rocks has more evident influence on instability probability. During the side slope stability analysis, the random variation in the mechanics parameters of weathered surrounding rocks, such as cohesion and interior friction angle, should be taken into consideration, thus a more scientific and reasonable safety evaluation can be obtained.
出处
《矿冶工程》
CAS
CSCD
北大核心
2012年第5期1-3,6,共4页
Mining and Metallurgical Engineering
基金
国家自然科学基金资助项目(51074178)
湖南省自然科学基金资助项目(09JJ4025)
中南大学前沿研究计划资助项目(2010QZZD001
2011QNZT087)
关键词
边坡
稳定性分析
失稳概率
采空区
slope
stability analysis
instability probability
mined-out area
