高寒地区冻融作用对高陡边坡安全稳定性影响分析

Analysis of the influence of freezing and thawing on the safety and stability of high and steep slopes in alpine region

本文根据某高寒地区矿山实际建设情况,通过现场测量、实验室试验、SVOffice软件模拟及极限平衡理论分析等方式,分析了高陡岩质边坡在冻融循环下的安全稳定性变化情况。经试验模拟及现场验证,当温差浮动在50℃左右时,冻融循环对岩体的影响主要体现在对浅部岩体强度的降低及裂隙的增加,冻结深度约小于8 m。针对某矿山的高陡边坡实际情况,经极限平衡理论分析,边坡整体安全系数较冻融前下降2.1%~5.2%,冻融循环对整体边坡稳定性影响较轻。

According to the actual construction situation of a mine in alpine region,the safety and stability of high and steep rock slope under freezing and thawing cycles are analyzed by means of field measurement,laboratory test,SVOffice software simulation and limit equilibrium theory analysis. The experimental simulation and field verification show that when the temperature difference is about 50℃,the influence of freeze-thaw cycle on rock mass is mainly reflected in strength decrease and fissure increase of shallow rock mass,and the freezing depth is less than 8 m. According to the actual situation of a mine with high and steep slope,the limit equilibrium theory analysis show that the overall safety factor of the slope is reduced by 2. 1%-5. 2% compared with that before freezing and thawing,and the influence of freezing and thawing cycle on the overall slope stability is light.