基于赤平投影法的西源岭边坡稳定性分析

通过对西源岭320、350、380、410m4个台阶边坡的优势结构面进行赤平投影分析,得到410平台有5种组合情况、380平台有1种组合情况、350平台有3种组合情况、320平台有1种组合情况可能发生楔形体破坏,以及410平台1处、350平台1处、320平台1处可能发生单平面破坏。然后,运用刚体极限平衡方法对各种实际的潜在破坏面进行天然及暴雨2种工况下的稳定性分析,得到了380平台F380-01与F380-02所控制的楔形体破坏在天然状态和暴雨状态下小于安全系数、350平台F350-03与F350-04控制的楔形体破坏以及320平台F320-11所控制的单平面破坏在天然工况下大于安全性系数、暴雨工况下小于安全性系数的结论。对比分析可知,赤平投影法可以很快速地搜索到可能滑动的结构面组合方式,但是要判断实际结构面组合是否滑动还需要进行定量分析。

Analysis of Xiyuanling Slope Stability Based on Stereographic Projection Method

Based on structural plane stereographic projection analysis of four platform slope, i. e. 320,350,380,410 platforms in Xiyuanling, Jiangxi Province, where 320,350,380,410 platforms mean the platforms at 320,350,380 and 410 m high respectively, it is known that,the 410 plat- form has five kinds of combinations, 380 platform has one kind of combinations, 350 platform has three kinds of combinations, 320 platform has one kind of combination which can occur plat- form wedge destruction. And 410, 350, 320 platform each has a place where may occur single plane damage. Then using rigid body limit equilibrium methods for various real potential failure surface under two kinds of natural and storm conditions the stability analysis was carried out. The results show that the wedge destruction controlled by 380 platform F380-01 and F380-02 in the natural state and storm conditions is less than the safety factor. The wedge destruction con- trolled by 350 platform F350-03 and F350-04, and the single plane destruction controlled by 320 platform F320-11 is greater than safety factor in natural conditions, and less than safety factor in storm conditions. Comparative analysis shows that stereographic projection method can very quickly search the structure of the sliding surface possible combinations. However, to determine whether the combination of the actual structure is sliding surface needs furtheremore quantitative analysis.