Factors influencing accuracy of free swelling ratio of expansive soil

作     者：WANG Liang-liang WANG Zhao-teng DING Zhi-ping LIN Yu-liang LEI Xiao-qin LIU Zhi-jun 王亮亮;王照腾;丁志平;林宇亮;雷小芹;柳志军

作者机构：School of Mechanics and Civil EngineeringChina University of Mining and TechnologyXuzhou 221116China State Key Laboratory for Geomechanics&Deep Underground EngineeringChina University of Mining and TechnologyXuzhou 221116China Xuzhou Design InstituteChina Railway Shanghai Design Institute Group Co.Ltd.Xuzhou 221000China School of Civil EngineeringCentral South UniversityChangsha 410075China Key Lab Mt Hazards&Earth Surface ProcInstitute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China 

出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)

年 卷 期：2022年第29卷第5期

页      面：1653-1662页

核心收录：

学科分类：081401[工学-岩土工程] 08[工学] 0814[工学-土木工程] 

基　　金：Project(2016M591957) supported by the China Postdoctoral Science Foundation Projects(51878667,51678571)supported by the National Natural Science Foundation of China Project(2017XKQY050) supported by the Fundamental Research Funds for the Central Universities,China 

主　　题：free swelling ratio particle size soil temperature wet-dry circulation expansive soil 

摘      要：Many geotechnical structures,such as the subgrade of high-speed railway,are extremely sensitive to micro *** one of the most commonly used indexes in China to evaluate the potential swelling level of expansive soils,the effectiveness and accuracy of free swelling ratio should be highly ***,due to the deficiency of geotechnical test regulations for the free swelling ratio test,non-negligible variation difference is often observed among the test results of the same type of soil ***,a series of laboratory tests are conducted to figure out the influences of soil particle size,initial soil temperature,and wet-dry circulation on the free swelling ratio of expansive *** results show that the initial soil temperature exerts an obvious influence on free swelling ratio and a relative weak influence on soil mass of expansive soil with the micro soil particle size(d0.075 mm),and the correlation becomes unclear when soil particle size is within the range of 0.075 mm≤d0.500 mm.A larger particle size of expansive soils induces a larger free swelling ratio and soil mass in the soil measuring cup regardless of initial soil ***,the enlarging amplitude decreases as the particle size of expansive soils *** is a progressive enlargement of free swelling ratio at the first two wet-dry cycles and then it attenuates gradually when the number of wetdry cycles further increases.