土压力水平向重分布模型试验系统研究  

Study on horizontal redistribution model test system of earth pressure

作　　者：薛丽影 孙威 杨斌 XUE Liying;SUN Wei;YANG Bin(State Key Laboratory of Building Safety and Built Environment,Beijing 100013,China;National Engineering Research Center of Building Technology,Beijing 100013,China)

机构地区：[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

出　　处：《建筑结构》2022年第6期138-143,84,共7页Building Structure

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。In order to study the horizontal redistribution law of earth pressure, a movable plate test device that can accurately measure the displacement and earth pressure of the movable plate was developed. The test device can simulate the spatial interaction between local support structure and soil at a certain depth, and can realize the change of local deformation, local deformation range, vertical stress and other conditions of the support structure. In the device, the axial force sensor is used to measure the earth pressure, which replaces the conventional earth pressure measurement method of embedded earth pressure box and improves the test accuracy. The test principle and structure of the test device were introduced. Using the device and the horizontal redistribution test method of earth pressure proposed, the horizontal redistribution 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 pit engineering only causes the redistribution of earth pressure, and the total resultant force of earth pressure remains unchanged.

关 键 词：深基坑 室内试验 支护结构 土压力 水平向重分布 

分 类 号：TU398.7[建筑科学—结构工程]