岩土工程学报2016，Vol.38Issue(5)：837-845,9.DOI:10.11779/CJGE201605009
模型试验中膜式土压力盒标定及其应用
Calibration tests on diaphragm-type pressure cells
摘要
Abstract
Diaphragm-type pressure cells are often used in geotechnical model tests and in-situ tests. The soil pressures are obtained through the measurement of the diaphragm deflection. With a gauge inserted into the soil or sand, the stiffnesses of the cells and the geo-medium are different. The soil arching in the soil or sand above the cells caused by the differential deformation will reduce the pressure on the diaphragm. In addition, different stress histories in the model tests result in different levels of influence. In the piled embankment multiple trapdoors model tests, the cells on the pile (fixed beams) experience a loading process, while the cells in the soil (movable beams) experience an unloading process. One loading calibration test and four unloading calibration tests are carried out on the same sand under the same relative density as in the model tests. The calibration results show that the stress-strain loading curves are almost linear and the unloading curves are quite similar to exponential ones. The calibration coefficients are obtained and then used to deal with the measurements. During the sand filling procedure, the average pressures obtained using the calibration coefficients coincide well with the self-weight of the embankments. During the settling (trapdoor movement) procedure, the pressures of the cells on the pile and in the soil are calculated using loading coefficients and unloading coefficients respectively. The results show that the soil pressure curves coincide well with those in the real model tests.关键词
膜式土压力盒/土拱效应/标定试验/陷阱门试验/桩承式路堤Key words
diaphragm-type pressure cell/soil arching/calibration test/trapdoor test/piled embankment分类
建筑与水利引用本文复制引用
芮瑞,吴端正,胡港,徐路畅,夏元友..模型试验中膜式土压力盒标定及其应用[J].岩土工程学报,2016,38(5):837-845,9.基金项目
国家自然科学基金项目（51208403）；中央高校基本科研业务费专项资金项目（WUT:2013-II-018）；武汉理工大学国家级大学生创新创业训练计划项目 （）
