万塘滑坡治理效果预测评价

Evaluation of Wantang landslide treatment effect

万塘滑坡是湖北省秭归县香溪河右岸受库水位变动影响的土质滑坡,拟采用抗滑桩进行治理,迫切需要对治理效果进行预测评价。以万塘滑坡地质结构特征、形成机制为基础,采用极限平衡法、FLAC3D显式有限差分法、ABAQUS有限元法相结合,分别从滑坡治理前后稳定性系数变化、剩余推力大小、应力应变分布特征、塑性区变化、抗滑桩桩身结构受力条件5个方面对滑坡治理效果进行评价。研究结果显示,滑坡经治理后不但局部稳定性得到改善,整体稳定性也能满足规范要求。计算结果不但为自然条件下滑坡稳定性分析提供了参考,还为滑坡治理工程效果评价提供了依据,并对施工后布置监测工作有指导意义。

Wantang landslide is an earth landslide on the north bank of Xiangxi river located of in Zigui County of Hubei Province.The anti-slide pile planned to be taken for managing the slope is urgently in need to evaluation the effect of control.Following analyzing the characteristics of the landslide and the cause,we can combine the limit equilibrium method,FLAC3D explicit finite difference method,ABAQUS finite element method for analyzing the treatment effect from five aspects such as the variation of the stability coefficient,the residual thrust,stress-strain characteristics,the change in plastic zone and the force on the anti-slide pile before or after taking measures.The re-sult shows that not only local stability is improved,but also the overall stability is in accordance with the specifica-tions.It is helpful for analyzing the stability of landslides under natural conditions and provides a good reference for the evaluation of treatment effect of land-slide.It is also significant for monitoring arrangements after the construction.