循环扭剪荷载下砂性土孔隙水压力生成影响因素和本构模型的研究  

Research on the influencing factors and constitutive models of pore water pressure generation in sandy soil under cyclic torsional shear loads

作　　者：王亚宁 孙风伯 赖莹 黄蕴晗 张静涛[1] Wang Yaning;Sun Fengbo;Lai Ying;Huang Yunhan;Zhang Jingtao(China Construction Second Engineering Bureau Co.,Ltd.,Beijing 100160,China;MOE Key Laboratory of Soft Soils and Geoenvironmental En-gineering,Zhejiang University,Hangzhou 310027,China;School of Civil and Ocean Engineering,Jiangsu Ocean U-niversity,Lianyungang 222005,China)

机构地区：[1]中国建筑第二工程局有限公司,北京100160 [2]浙江大学软弱土与环境土工教育部重点实验室,杭州310027 [3]江苏海洋大学土木与港海工程学院,连云港222005

出　　处：《土木工程学报》2024年第S2期47-52,共6页China Civil Engineering Journal

基　　金：中国建筑股份有限公司资助项目(CSCEC-PT-017)。

摘　　要：基于砂性土的室内循环扭剪实验结果,本文对循环扭剪荷载作用下砂性土孔隙水压力生成的影响因素进行了研究。实验设备在传统循环扭剪装置的基础上进行了升级,对样本顶盖和底座进行了定制化改造,增设了排水通道,并配套了水压传感器,实现了样本孔隙水压力的全过程监测。实验样本包含了砂土重塑样本和低塑性粉土原状样本,均为饱和状态。通过对实验数据的对比分析和回归拟合,讨论了荷载循环次数、围压和细粒含量对砂性土孔隙水压力产生的影响,并提出了循环扭剪荷载下砂性土孔隙水压力生成的本构模型。鉴于现有数据有限,该模型的适用范围具有一定的局限性,其用途更聚焦于砂土液化触发阈值和液化过程早期阶段的研究。Based on the cyclic torsional shear test results of sandy soil,this study investigates the factors influencing pore water pressure generation in sandy soil under cyclic torsional shear loads.The experimental equipment was upgraded from the traditional cyclic torsional shear testing device.Pore water pressure generation was monitored during the entire testing process through the application of the custom-built top cap and base pedestal with added drainage channels and water pressure transducers.The testing specimens are composed of reconstituted sand specimens and undisturbed low-plasticity silt specimens in a saturated state.Based on comparative and regression analysis of experimental data,the effects of load cycles,confining pressure,and fines content of soil on the pore water pressure generation of sandy soil were discussed,and a constitutive model for the pore water pressure generation of sandy soil under cyclic torsional shear loads was proposed.Due to the limited available data,the applicability of this model has certain limitations,and its application should be more focused on the study of the triggering threshold for sand liquefaction and the early stage of liquefaction process.

关 键 词：砂性土 循环扭剪实验 孔隙水压力 本构模型 砂土液化 

分 类 号：TU441[建筑科学—岩土工程]