The loess foundation pit model of combined supporting structure of internal and external in-clined piles,double-row straight piles and front straight and rear inclined double-row piles was estab-lished by PLAXIS 3D finite element software.The variation law of pile stress and deformation of each supporting structure during excavation was studied,and the influence of rainfall on the stability of foundation pit was analyzed and compared.The results show that under the same conditions,the in-clined composite pile is better than the double-row straight pile in controlling the settlement outside the pit,the stress and deformation of the pile.The stress and deformation performance of the combi-nation of internal and external inclination in single-row piles are better than that of double-row piles.The mechanical deformation characteristics of double-row piles with straight front and inclined back are better than those of double-row piles.Rainfall has a great influence on loess foundation pit,and the safety factor of foundation pit of each supporting structure decreases from 0.18 to 0.30.The safe-ty factor of double-row straight pile foundation pit is the lowest,the combination of internal and ex-ternal inclination is the best,and the double-row straight pile is the second.
关键词
倾斜组合支护桩/黄土基坑/数值分析/基坑开挖/降雨
Key words
inclined composite supporting pile/loess foundation pit/numerical analysis/excavation/rainfall
维普
万方数据