|Table of Contents|

Study on Static Lateral Pressure Coefficient Based on Three-dimensional Stress State(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2022年05期
Page:
193-201
Research Field:
基础工程
Publishing date:

Info

Title:
Study on Static Lateral Pressure Coefficient Based on Three-dimensional Stress State
Author(s):
LI Shun-qun1; 2;  LIU Ji-cheng1;  LIU Xiao-lan1;  ZHANG Yan1;  HUANG Xiong-fei3
(1.School of Civil Engineering, Tianjin Chengjian University, Tianjin 300384, China; 2.Tianjin Key Laboratory of Soft Soil Characteristics and Engineering Environment, Tianjin Chengjian University, Tianjin 300384, China; 3.Anhui Shui'an Construction Group Co., Ltd., Hefei 230601, Anhui, China)
Keywords:
static lateral pressure coefficient;  cylinder model test;  three-dimensional stress test method;  shallow sand
PACS:
TU432
DOI:
10.19815/j.jace.2021.05057
Abstract:
To study the static lateral pressure coefficient K0 of soil, based on the compression deformation characteristics of soil, a cylinder model test device which can measure K0 was designed and made, and one-dimensional loading and unloading compression test was carried out on shallow sand in Tianjin area. The earth pressures in all directions were measured by using a three-dimensional earth pressure box, and the three-dimensional stress states of the soil at the depths of 20, 70, 120 cm were obtained. Based on the K0 calculation formula in the form of ratio, the variation law of K0 at different depths was revealed, and the values of K0 in the horizontal direction x and y at the same depth were compared and analyzed. The results show that after three stages of loading, unloading and stabilization, the normal stresses σx, σy and σz of different depths firstly increase and then decrease and finally stabilize with the test time, and the vertical stress decreases obviously along the depth. The change trend of K0 in different depth is basically the same, the sudden change of K0 in the early stage of loading is reasonable, and its stable value at 120 cm meets the requirements of the design code. Under the condition of loading and unloading, the value of K0 increases with the increase of depth, and the difference between stable values of K0x and K0y at the same depth is between 0.04 and 0.07, which is consistent with the axisymmetric stress condition and the anisotropy of soil. The K0 value obtained by the traditional empirical method is 0.416, which is within the range of the stable K0 value calculated by the experiment. The structure of the test device is stable and systematic, the operation is simple and convenient, the test results are accurate and reliable, and the research findings can provide a reference for the K0 study of all kinds of soil.

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Last Update: 2022-09-30