不同施工条件下基坑预降水对地连墙侧移影响研究

发布时间：2018-02-24 01:04

本文关键词： 深基坑预降水地连墙侧移有限元计算基坑宽度　出处：《岩土工程学报》2017年S2期 　论文类型：期刊论文

【摘要】：已有工程实测表明,基坑开挖前的预降水可引起围护结构和周边环境厘米级的变形,但相关的研究报道还是偏少,基坑预降水引起的基坑变形性状仍未被全面揭示。采用ABAQUS建立考虑降水井瞬态降水的二维流固耦合有限元模型,研究了基坑宽度和预降水深度对预降水引发变形的影响。研究表明,预降水引发的最大地连墙侧移及地连墙侧移沿深度发展范围随着基坑宽度、降水深度的增加而增大,并且存在临界基坑宽度使得在临界宽度范围内,最大地连墙侧移及地连墙侧移深度范围随基坑宽度的增加而快速增加,而超过临界宽度后,基坑宽度对地连墙侧移的影响会明显减弱;同时存在临界降水深度,使得在其范围内,最大地连墙侧移随预降水深度的增加而变化缓慢,而超过临界降水深度后,降水深度的增大将引起最大地连墙侧移发生较大幅度的增长。
[Abstract]:The actual measurements of existing projects show that pre-dewatering before excavation of foundation pit can cause the deformation of the surrounding structure and surrounding environment of centimeter level, but the related research reports are still on the low side. The deformation behavior of foundation pit caused by pre-dewatering of foundation pit has not been fully revealed. A two-dimensional fluid-solid coupling finite element model considering transient dewatering of dewatering wells is established by using ABAQUS. The influence of foundation pit width and pre-dewatering depth on pre-dewatering induced deformation is studied. And there is critical foundation pit width so that in the critical width range, the maximum depth range of the lateral displacement of the connecting wall and the depth of the lateral displacement of the ground connection wall increases rapidly with the increase of the width of the foundation pit, and when the critical width exceeds the critical width, The influence of foundation pit width on the lateral displacement of the ground connection wall is obviously weakened, and the critical precipitation depth exists, which makes the maximum wall lateral displacement change slowly with the increase of the pre-precipitation depth, but when the critical precipitation depth exceeds the critical precipitation depth, the maximum wall lateral displacement changes slowly with the increase of the pre-dewatering depth. The increase of precipitation depth will result in a large increase of the maximum wall displacement.
【作者单位】：湖南科技大学岩土工程稳定控制与健康监测湖南省重点实验室;天津大学滨海土木工程结构与安全教育部重点实验室;广西大学工程防灾与结构安全教育部重点实验室;
【基金】：国家自然科学基金项目(51578164,51708206,11602083) 广西自然科学基金创新研究团队项目(2016GXNSFGA380008) 湖南省自然科学基金项目(2016JJ6044) 湖南省教育厅项目(15C0557) 滨海土木工程结构与安全教育部重点实验室开放课题(2017-KF03)
【分类号】：TU476.3;TU753.66

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