下红岩堆积体抗滑桩加固效果监测分析

Monitoring and Analysis of Reinforcement Effect on Anti-slide Piles of Xiahongyan Talus Slope

对抗滑桩加固效果的监测分析,是滑坡治理工程中的一项重要工作,对检验滑坡治理效果以及监控抗滑工程的安全性有着重大意义,也为抗滑桩优化设计提供了可借鉴的实测资料。为了检验西南某水电站下红岩堆积体抗滑桩加固效果及保障水电站施工期的安全,采用大地测量与GPS相结合的方法、钻孔测斜仪法、钢筋计法等,对该堆积体表面变形、内部变形、地下水位变化,抗滑桩的应力、应变以及所受土压力进行了长期监测。监测结果表明:抗滑桩对堆积体起到了较好的加固作用;降雨是堆积体内部变形的一个重要影响因素;堆积体顶部位移量较大,深部未发生较大变形;堆积体的变形量从前部往后部逐渐增大。

Monitoring and analysis of reinforcement effect on anti-slide piles is an important work in the landslide control project, which has great significance to test the reinforcement effect of landslide and monitoring the safety of anti-slide project, also provides a reference for the optimization design of anti-slide piles. In order to test the reinforcement effect on anti-slide piles of Xiahongyan talus slope in a hydropower station in southwest China and guarantee the safety of the construction period of the hydropower station, a long term monitoring has been conducted for the surface deformation, inner deformation and variation of groundwater level of the talus slope and the stress, strain and the soil press of the anti-slide piles by the combination method of geodesy and GPS, drilling inclinometer method and steel meter method and so on. Analysis of the monitoring results shows ： the anti-slide piles play a significant role in reinforcing the talus slope ; rainfall is an important factor affecting the inner deformation of the talus slope ; a lager deformation exists in the top but no obvious deformation exists in the depth of the talus slope ; the deformation of the talus slope is gradually enlarged from the front part to the back.