川南S_8滑坡体不稳定现象分析与防治

Unstable phenomena analysis and control to the S_8 sliding body

S8滑坡体后壁出露有新鲜滑动面,两侧呈双沟同源,坡体出现大量裂缝,前缘缓慢推移等,充分说明该滑坡体正处于不稳定状态。主要原因是:季节性洪水侵蚀滑坡体,前缘出现了临空面,使前缘支撑作用减弱;滑坡体内裂隙发育,裂隙水动力作用使滑动面抗滑能力降低;邻近采煤区造成的采动裂隙增强了水动力作用。该滑坡体裂隙丰富,保水性差,不利于植物生长;滑坡体边缘不断垮塌造成水土流失,沉积物淤塞下游河谷。防治措施有:在滑坡体后壁修筑排水沟,关闭邻近小煤窑,在前缘冲沟里构筑堡坎以减小水侵蚀作用;在冲沟里构筑拦砂埂,抬高沟底阻止切向侵蚀,以稳定滑坡体前缘。

Fresh sliding plane on the back of the S\-8 sliding body has been revealed.Both sides of the sliding body have shown the same source.There are many crevices on the body′s surface and the body′s foreslope is moving slowly.Above\|mentioned phenomena show that the sliding body is in an unstable situation.The main reason lies in that seasonal flood eroded the sliding body inducing the cliffy face arising on the foreslope,and the supporting action of the foreslope weakened; Since the cracks have been developed in the sliding body,fissure water action reduces the anti\|sliding ability of the sliding plane;The mining activity of the coal mine area nearby increased water dynamic activity.Low water retention ability is not suitable for vegetation growth;Foreslope collapse caused soil erosin,the lower reaches of the velley has been silted up by sediment.Main prevention and control measures are as follows:the drainage ditch has been built on the rare of the sliding body,the nearby small mines have been closed,protecting wall has been built in the scour ditch.Water dynamic action can be weakened, and erotion can be stoped, so as to increase the stability of the sliding body foreslope.