深基坑护坡桩土压力的工程测试及研究  

STUDY ON THE EARTH PRESSURE OF FENDER PILES FOR EXCAVATIONS IN REAL PROJECTS AND MODEL TESTS

作　　者：何颐华[1] 杨斌[1] 金宝森[1] 李瑞茹 谭永坚[1] 王铁宏[1] 

机构地区：[1]中国建筑科学研究院

出　　处：《土木工程学报》1997年第1期16-24,共9页China Civil Engineering Journal

摘　　要：本文通过对粘性土基坑支护工程及室内模型试验中上压力、桩背土体变形、护坡桩内力与水平位移等实测资料的研究,重点分析了悬臂桩在基坑开挖后土压力分布形态的变化与土体变形情况,探讨了护坡桩的破坏机理,并提出由于桩的位移与土体变形的不协调,造成桩与桩背土体之间裂缝的向下延伸,使土压力作用点下移,从而使桩身受力减小的观点.Based on the numerical data of earth pressure, deformation of soil, stress in fender pile and its displacement measured in excavation engineerings and model tests, the variation of distribution of earth pressure on the cantilever pile and the deformation of soil after excavation are mainly discussed and analysed in this paper. The failure mechanism of the fender pile is then investigated and studied. It is advanced that the gap between the soil and back of the piles occurs and extends downward due to the noncoincidence between the displacement of piles and the deformation of soil. It causes the point of force acting on pile to move down and thus reduces the stresses in the fender piles.

关 键 词：土压力 土体变形 裂缝 深基坑护坡桩 基坑开挖 

分 类 号：TU432[建筑科学—岩土工程] TU473.2[建筑科学—土工工程]