摘要
降雨对排矸场边坡的稳定性有重要影响,研究降雨入渗过程中排矸场边坡材料物理力学性质的变化,可以更好地确定降雨对排矸场稳定性的影响程度。本文通过分析排矸场的降雨入渗过程,确定了基于湿润峰推进距离的边坡入渗降雨量计算方法。考虑到降雨入渗的时间效应和累计作用,提出了利用有效降雨量确定连续降雨下边坡雨强的估算方法。通过对Bishop方程和Vanapalli方程的对比分析,确定了降水作用下矸石材料的强度计算方法。基于上述理论对降雨作用下王家岭选煤厂排矸场的稳定性进行了分析。计算结果表明:随着降雨量的增大,矸石的湿润峰逐步加深,材料的基质吸力从上到下逐步降低;边坡的稳定性系数随降雨量的增大也在不断降低,当降雨量大于90 mm/d时下降速度会加快。结合排矸场近10年的降水数据,计算出排矸场边坡在最大有效降雨量下的稳定性系数为1.2。分析结果表明:此排矸场边坡的稳定性较好,现有降雨条件不会导致边坡失稳破坏。
Rainfall plays an important role in the slope stability of the gangue field.The analysis of the change of material physical and mechanical properties of gangue field slope during rainfall infiltration can let us calculate the degree of influence of rainfall on the stability of the gangue field more accurately.This paper analyzes the rainfall infiltration process of the gangue field and determined the calculation method of rainfall infiltration of the slope based on the advance distance of the wetting peak.Considering the time effect and cumulative effect of rainfall infiltration,proposes the estimation method to determine the rain intensity of slope under continuous rainfall by using effective rainfall.This paper compares the calculation parameters of Bishop s equation and Vanapalli s equation and determines the calculation method of the strength of gangue materials under the action of rainfall.Based on the theory,the stability of Wangjialing gangue field slope under rainfall is analyzed.The calculation results show that with the increase of rainfall,the wetting peak of gangue gradually deepens and the matrix suction of the material gradually decreases from top to bottom.The stability coefficient of the slope is also decreasing with the increase of rainfall,and the decreasing speed will be accelerated when the rainfall is more than 90 mm/d.Combining with the precipitation data of the gangue field in recent 10 years,the stability coefficient of slope under the maximum effective rainfall is calculated as 1.2.The results show that the slope of this gangue field is stable,and the existing rainfall conditions will not lead to slope destabilization and destruction.
作者
李雅阁
章力
LI Yage;ZHANG Li(China National Coal Group Corporation,Beijing 100120,China;Wangjialing Coal Preparation Plant,China Coal Huajin Group Corporation,Yuncheng 043300,China)
出处
《中国矿业》
2021年第9期67-72,共6页
China Mining Magazine
关键词
煤矸石
排矸场
降雨
有效降雨量
边坡稳定性
coal gangue
gangue field
rainfall
effective rainfall
slope stability
