The Response Of Deep Excavation In The Front Of District ? Of Lintong Lishan Landslide

It is seriously of deep excavation in front of the landslide,But it is often seen,Disaster often occurs.It is great significance of theory and reality to study the influence of the deep excavation in front of the landslide.Based on the deep excavation in front of the landslide as the background it studied with the methed of theoretical analysis in-situ monitoring and numerical simulation to analysis the deformation law of the landslide?anti slide pile and supporting pile Under different excavation conditions,In order to reveal the landslide(support engineering)response of deep excavation to guide engineering practice.The main results and conclusions as follows:(1)?Based on the basic characteristics and the theory calculation results of the landslide,The landslide treatment scheme-"Three level support + drainage system" and construction monitoring scheme—"Multi-point monitoring + tracking prediction" are designed.Ensure the smooth and safe implementation of deep foundation pit project.(2)?The field monitoring experiment was carried out to acquire the deformation curve of the landslide deep displacement,supporting pile and the deformation curve of soil pressure?strerss along the backside pile of the anti slide piles and supporting piles in different excavation conditions,timely analysis,tracking and forecasting,to guide the engineering practice.?Curve of displacement of deep landslide tilts toward the back side of the mountain and occurs mutation in sliding surface;?With the increase of excavation depth,C9 pile lateral reinforcement stress increasing,Above the excavation face the stress first increases,then the soil resistance,in the excavation face began to decrease,and then continue to increase,and then decreased.The curve is "Shuangfeng";?With the increase of the depth of foundation pit,the outboard stress of the B10 anti slide pile increases,the curve changes greatly in sliding surface.?The measured values of C9 and B10 piles are small under different excavation conditions,but they are obvious in the sliding zone.(3)?simulate the excavation process of deep foundation pit for slide and treatment slideby FLAC3D software.Analyze the deformation characteristics of landslide,anti slide pile and supporting pile,The deformation characteristics are basically the same the simulated as the measured.The effectiveness of landslide control scheme is tested.