Numerical Simulation And Application Study On Combined Bolting Of Pile-Anchor And Soil Nailing Wall In Deep Excavation

In recent years, pile-anchor and soil nailing wall combined bolting form has been increasingly applied in deep foundation pit. Peripheral environment conditions in the current foundation pit has been more and more complicated circumstances. It is really a way to meet the engineering practical needs simultaneously which could be better to control the deformation of effective combined bolting form. However,the current engineering usually use this combination fractionation divide to soil nailing wall and pile-anchor separately designed. Due to ignoring the interaction between the two parts, the design method exist obvious errors.This paper introduces the pile-anchor and soil nailing wall combination of retaining structure deformation modes and traditional design theory and calculation method. Using finite difference FLAC^3D software , it is strictly according to the actual construction model excavation supporting for combined bolting, pile--anchor and soil nailing wall in the whole process under similar conditions. Through the analysis on these three models of the characteristic of the comparative study of different simulation value, two parts's mechanics of the interaction has been revealed. Based on the rule of further summary and analysis, the numerical simulation method of optimization design for combined bolting of the excavation engineering has been put forward. Firstly, we can find out the respective design results of unearthed nailed wall and pile-anchor by theoretical calculation software. And then FLAC^3D can be used for simulated trying calculating under the initial results. Finally, combined bolting optimization design of excavation engineering obtained after several times trying calculating and comparison.In the end, a deep foundation pit engineering of handan city has been given for example. Design of the combined bolting has been optimized by the numerical simulation method. Through the contrast between simulation calculation results and engineering observation data, the feasibility of this method has been validated. The method which has been proved effective and rational and feasible will make this combination supporting technology applied more and more widely.