砂卵石地层圆形深基坑排桩支护结构受力特征

发布时间：2018-01-06 21:25

本文关键词：砂卵石地层圆形深基坑排桩支护结构受力特征　出处：《地下空间与工程学报》2015年06期 　论文类型：期刊论文

【摘要】：平面为圆形的深基坑工程近年来逐渐出现在以砂卵石地层为主的成都平原地区,其支护结构型式多为排桩结合圈梁构成的排桩框架结构。这种空间结构受力较为复杂,针对工程实际的迫切需要,基于数值模拟方法,依托成都某圆形深基坑工程,分析了排桩框架结构的内力和变形特征及桩径、桩端地层、基坑直径等因素对其的影响规律。结果表明,围护桩后侧土压力接近三角形分布,可采用Rankine理论近似计算,结果偏于安全,误差约为30%;围护桩具有双向弯曲特征,冠梁和腰梁均以轴向受压为主,腰梁受力较大;随着坑径增大,作用于围护桩上的土压力先减小后增大,其间存在使土压力最小最佳坑径。
[Abstract]:The plane is circular deep foundation pit engineering gradually appeared in recent years in the sand gravel strata are mainly in Chengdu plain, the type of support structure for multi row pile frame structure of row pile combined with a ring beam. The space structure of force is more complex, the urgent need for practical engineering, the numerical simulation method based on a circular, relying on Chengdu deep foundation pit engineering, analyzed the internal force of pile frame structure and deformation characteristics of pile diameter, pile tip stratum, excavation diameter and other factors on the influence law. The results show that the pile side soil pressure near the triangular distribution, can be used Rankine theory of approximate calculation, results in safety, the error is about 30%; retaining pile has the bidirectional bending characteristics, crown beam and waist beam in axial compression, beam waist is larger; with pit diameter increases, the earth pressure acting on retaining pile decreases first then increases during the existence of the minimum soil pressure The best hole diameter.

【作者单位】：西南交通大学土木工程学院;成都市建工科学研究设计院;西南交通大学地质工程系;中国建筑西南勘察设计研究院有限公司;
【基金】：中央高校基本科研业务费专项资金(SWJTU11CX060)
【分类号】：TU753
【正文快照】： 1引言目前的圆形深基坑工程大多集中在软土地区,且主要采用地下连续墙作为围护结构[1~5],以充分发挥其内部空间大等突出优点,但近几年来,伴随着经济的发展,以砂卵石地层为主的成都平原地区也逐渐出现了圆形深基坑工程,采用的是排桩框架支护结构。典型实例为目前我国西南地区最

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