基坑围护结构最大侧移深度对周边环境的影响

发布时间：2018-03-09 12:08

本文选题：深基坑　切入点：最大侧移深度　出处：《岩土力学》2016年10期 　论文类型：期刊论文

【摘要】：围护结构最大侧移所在深度是衡量基坑变形的重要指标之一,而目前鲜有关于其对周边环境变形影响的研究。基于工程实测数据分析和有限元数值模拟,系统地研究了基坑围护结构最大侧移深度对邻近桩基础建筑物不均匀沉降和坑外深层土体位移场的影响。经研究发现:围护结构最大侧移的下移会导致坑外土体位移场扩大,进而降低相应区域的桩基础承载力,导致邻近桩基础建筑物发生显著的不均匀沉降。不同深度的土体经历复杂的竖向位移,且位移形态与围护结构最大侧移深度密切相关。随围护结构最大侧移深度的逐渐下移,坑外土体位移场向深层土体发展,且主要影响范围相应地扩大。在实际工程中,根据基坑周边环境合理地控制围护结构最大侧移所在深度,可有效降低基坑开挖对周边环境的不利影响。
[Abstract]:The depth of maximum lateral displacement of retaining structure is one of the important indexes to measure the deformation of foundation pit, but there is little research on its influence on the surrounding environment at present. Based on the analysis of engineering measured data and finite element numerical simulation, The influence of the maximum lateral displacement depth of foundation pit enclosure on the uneven settlement of adjacent pile foundation building and the displacement field of deep soil outside the pit is systematically studied. It is found that the maximum lateral displacement of the retaining structure will result in the expansion of the displacement field of the soil outside the pit. And then reduce the bearing capacity of pile foundation in the corresponding area, resulting in significant uneven settlement of adjacent pile foundation buildings. The soil with different depth experienced complex vertical displacement. The displacement pattern is closely related to the maximum lateral displacement depth of the enclosure structure. With the gradual downward movement of the maximum lateral displacement depth of the enclosure structure, the displacement field of the soil outside the pit develops to the deep soil mass, and the main influence range is expanded accordingly. According to the surrounding environment of foundation pit, the depth of maximum lateral displacement of retaining structure can be reasonably controlled, which can effectively reduce the adverse effect of excavation on the surrounding environment.
【作者单位】：同济大学地下建筑与工程系;中交四航工程研究院有限公司;中铁二院华东勘察设计有限责任公司;华东交通大学土木建筑学院;
【基金】：国家重点基础研究发展计划(973计划)项目(No.2015CB057800) 国家重点研发计划(No.2016YFC0800204)~~
【分类号】：TU753

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