采空区对边坡稳定性的数值模拟研究

Numerical Simulation for the Influence of Goaf on the Slope Stability

为了研究采空区对边坡的稳定性影响,对含采空区的边坡进行调查研究,分析采空区顶板的稳定性;利用有限元分析软件建立含不同跨度、位置和双层采空区的边坡模型,采用强度折减法求解边坡的安全系数,并确定最危险滑动面,分析边坡安全系数与三者之间的变化关系。结果表明,对于含不同位置、不同跨度和双层采空区的边坡,安全系数均有不同程度的下降,单采空区最大降幅为10.7%,边坡最可能滑动的位置均是边坡坡顶至坡脚的圆弧面;而双采空区最大降幅为17.9%,边坡最可能滑动的位置是坡顶与采空区上部。该研究成果可为类似采空区边坡的稳定性研究提供参考。

In order to study the influence of goal on the slope stability, the slope containing goafs was investigated and the stability of goaf roof was analyzed. The slope models with different spans, locations and double-decked goafs were es- tablished by finite element analysis software. Besides, the safety coefficients of slope were calculated by strength reduc- tion method, and the most dangerous sliding surface was de- termined. The change relationships between safety coeffi cients of slope with above three kinds of parameters were an- alyzed. The results showed that the safety coefficients of slope with different spans, locations and double-decked goafs all had different degrees of decline. The largest decline of single goaf was 10.7%, and the most probable sliding posi- tion of slope was the are surface from the slope crest to slope toe. Besides, the largest decline of double goaf was 17.9%,and the most probable sliding position of slope was in the slope crest and the top of goaf. The results could provide a reference for the stability research of similar slope.