温度影响下不同含水率细砂中土压力盒测试结果试验研究  

EXPERIMENTAL STUDY ON TEST RESULTS OF EARTH PRESSURE CELLS BURIED IN FINE SAND WITH DIFFERENT MOISTURE CONTENT UNDER THE INFLUENCE OF TEMPERATURE

作　　者：曾力[1] 鲁臻臻 李明宇[1] 赵世永 靳军伟[1] 刘玉豪 ZENG Li;LU Zhenzhen;LI Mingyu;ZHAO Shiyong;JIN Junwei;LIU Yuhao(School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China;China Railway 15th Bureau Group Co.,Ltd.,Shanghai 200070,China;Urban Rail Transit Engineering Co.,Ltd.,China Railway 15th Bureau,Luoyang 471000,Henan,China)

机构地区：[1]郑州大学土木工程学院,郑州450001 [2]中铁十五局集团有限公司,上海200070 [3]中铁十五局集团城市轨道交通工程有限公司,河南洛阳471000

出　　处：《力学与实践》2022年第1期100-108,共9页Mechanics in Engineering

基　　金：国家自然科学基金(51508520);河南省住房城乡建设科技计划项目(K-1817、K-1818、K1816、K-1940)资助。

摘　　要：在长期的工程监测中,土压力盒的测量精度易受到周围土体环境温度变化的影响。为了提高土压力测量值的可靠度,本文将电阻应变式微型土压力盒埋设于装填有不同含水率细砂的标定桶中,运用冻融循环箱模拟温度变化环境,系统研究了温度循环变化时多个因素对土压力盒测量结果的影响。通过试验研究发现:标定桶内砂土的温度从20°C降低到0°C再升高到20°C的单个冻融过程中,温度对土压力盒测量压力值的影响较大,且得到的温度标定系数为负值,细砂的含水率对土压力盒的温度标定系数的影响相对较弱,采用较小量程的土压力盒以及细砂上部载荷量的增加会使土压力盒的温度敏感性增强;冻融循环次数的增多,会造成土压力盒测量值的损失。In the long-term engineering monitoring,the measurement accuracy of the earth pressure cell is easily affected by the temperature change of the surrounding soil.In order to improve the reliability of the measurement of the earth pressure,a few resistance strain type miniature earth pressure cells were embedded in a calibration bucket filled with fine sand with different moisture content,and a freeze-thaw cycle tank was used to simulate the temperature change environment.Multiple factors on the measurement results of the earth pressure cell were systematically studied with cycling temperature.Through experimental research,it is found that during a single freeze-thaw process where the temperature of the sand in the calibration bucket decreases from 20°C to 0°C and then rises to 20°C,the temperature has a greater influence on the measured pressure value of the earth pressure cell,and the temperature calibration coefficient is negative.The moisture content of fine sand has a relatively weak influence on the temperature calibration coefficient of the earth pressure cell.The use of a smaller-range earth pressure cell and the increase of the load on the upper part of the fine sand will increase the temperature sensitivity of the earth pressure cell.As the number of freeze-thaw cycles increases,the measured value of the earth pressure cell will be lost.

关 键 词：土压力盒 冻融循环 含水率 量程 上部载荷 

分 类 号：TU432[建筑科学—岩土工程]