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土压力水平向重分布模型试验系统研究
薛丽影1,2, 孙 威1,2, 杨 斌1,2
摘 要

(1 建筑安全与环境国家重点实验室, 北京 100013; 2 国家建筑工程技术研究中心, 北京 100013)

摘要: 为了研究土压力水平向重分布规律,研发了可精确测量活动板位移与土压力的活动板试验装置。 该试验装置可模拟某一深度处局部支护结构与土体的空间相互作用,并能够实现支护结构局部变形及局部变形范围、竖向应力等条件的改变,在装置中利用轴力传感器来测量土压力,替代了埋置土压力盒的常规土压力测量方法,提高了测试精度。 介绍了该试验装置的构造及试验原理,利用该装置以及所提出的土压力水平向重分布试验方法,对活动板松弛位移引起的土压力水平向重分布规律进行了试验研究。 根据试验结果,近似认为基坑工程中局部土体松弛变形只引起土压力的重分布,土压力总合力不变。

关键词: 深基坑; 室内试验; 支护结构; 土压力; 水平向重分布

中图分类号:TU398. 7 文献标志码:A 文章编号:1002 ̄848X(2022)06 ̄0138 ̄06

DOI:10. 19701 / j.jzjg.YG1581

Study on horizontal redistribution model test system of earth pressure

XUE Liying1,2, SUN Wei1,2, YANG Bin1,2

(1 State Key Laboratory of Building Safety and Built Environment, Beijing 100013, China; 2 National EngineeringResearch Center of Building Technology, Beijing 100013, China)

Abstract: In order to study the horizontal redistribution law of earth pressure, a movable plate test device that canaccurately measure the displacement and earth pressure of the movable plate was developed. The test device can simulatethe spatial interaction between local support structure and soil at a certain depth, and can realize the change of localdeformation, local deformation range, vertical stress and other conditions of the support structure. In the device, the axialforce sensor is used to measure the earth pressure, which replaces the conventional earth pressure measurement method ofembedded earth pressure box and improves the test accuracy. The test principle and structure of the test device wereintroduced. Using the device and the horizontal redistribution test method of earth pressure proposed, the horizontalredistribution law of earth pressure caused by the relaxation displacement of movable plate was experimentally studied.According to the test data, it is approximately considered that the relaxation deformation of local soil in foundation pitengineering only causes the redistribution of earth pressure, and the total resultant force of earth pressure remainsunchanged.

Keywords:deep foundation pit; laboratory test; support structure; earth pressure; horizontal redistribution

第一作者:薛丽影,硕士,高级工程师,主要从事岩土工程方面的研究,Email:xlydjs@ 163.com。

[引用本文] 薛丽影,孙威,杨斌. 土压力水平向重分布模型试验系统研究[ J]. 建筑结构,2022,52(6):138 ̄143,84. XUE Liying, SUN Wei, YANG Bin. Study on horizontal redistribution model test system of earth pressure[J]. BuildingStructure,2022,52(6):138 ̄143,84.

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