沉井基础基底接触应力分布规律分析

发布时间：2018-01-05 01:09

本文关键词：沉井基础基底接触应力分布规律分析　出处：《桥梁建设》2017年04期 　论文类型：期刊论文

【摘要】：基底接触应力分析是研究沉井基础承载能力的基础。为确定沉井基础基底接触应力在不同荷载下的分布规律,制作5组不同宽度和埋深的基础模型进行静载试验,研究沉井基础在加载过程中基底接触应力的分布及变化规律,并基于极限平衡理论提出不同荷载阶段下基底接触应力的简化计算公式,将计算结果与试验结果及数值模拟结果进行对比。结果表明:基础边缘土体尚未屈服时,基底接触应力沿基础中心线对称呈均匀分布或抛物线形分布,基础边缘应力大于基础中心应力;基础边缘土体屈服后,基底接触应力峰值逐渐向基础中心移动,整体分布呈马鞍形;提出的基底接触应力计算方法结果与模型试验和数值模拟的结果大致相同。
[Abstract]:The contact stress analysis is the foundation of the caisson foundation bearing capacity. In order to determine the distribution of contact stress in the basement of the caisson foundation under different load, making 5 sets of different width and depth of the model based on the static load test, the caisson foundation in the loading process of basal distribution and variation of contact stress. And the simplified limit equilibrium theory put forward different loading stages under basal contact stress based on the calculation formula, the calculation results with the experimental results and numerical simulation results were compared. The results showed that the soil has not yet yield edges, the contact stress along the center line of symmetry based uniform distribution or parabola distribution, edge stress is greater than the Foundation Center stress; yield based edge soil, the contact stress peak moves to the center, the overall distribution of saddle shape; stress calculation of contact The results of the method are approximately the same as the results of the model test and the numerical simulation.

【作者单位】：西南交通大学土木工程学院;
【基金】：中国铁路总公司科技研究开发计划课题(2013G001-A-2)~~
【分类号】：U443.131
【正文快照】： 1引言大型沉井基础承载能力的确定是沉井设计计算中的关键问题[1]。从沉井基础的几何特征来看,沉井基础刚度较大、深宽比较小;从相似理论的角度来分析,地基土应该遵循浅基础破坏的一般规律。但沉井基础的平面尺寸和埋深远大于浅基础,有些沉井的埋深可以达到80 m以上,这种情况

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