循环三轴荷载作用下砂土孔隙水压的发展规律  

Generation of excess pore pressure in sands subjected to cyclic triaxial loading

作　　者：岑君 彭好 魏骁[2] 杨仲轩[3] 杨峻[4] 程延 CEN Jun;PENG Hao;WEI Xiao;YANG Zhongxuan;YANG Jun;CHENG Yan(Zhejiang Communications Construction Group Co.,LTD.,Fuyang 311421,China;Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou 310058,China;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China;Department of Civil Engineering,The University of Hong Kong,Hong Kong,China)

机构地区：[1]浙江交工地下工程有限公司,浙江富阳311421 [2]浙江大学滨海与城市岩土工程研究中心,浙江杭州310058 [3]浙江大学建筑工程学院,浙江杭州310058 [4]香港大学土木工程系,中国香港

出　　处：《岩土工程学报》2023年第S02期264-269,共6页Chinese Journal of Geotechnical Engineering

基　　金：浙江省重点研发计划(2022C03180);国家自然科学基金项目(52108351);浙江省建设厅项目(2022K073);浙江交协同创新联合研究中心项目(ZDJG2021001)。

摘　　要：地震荷载在土体中诱导产生的超孔隙水压发展会导致砂土液化和破坏。准确合理地表征超孔隙水压在循环荷载作用下的发展规律对液化分析至关重要。采用净砂和细粒含量为10%的含粉粒砂土开展了一系列不排水循环三轴试验,基于两种超孔隙水压模型(均匀循环应力模型和能量耗散模型)对数据进行了分析,提出了一个能更好表征孔隙水压发展的均匀循环应力模型并标定了模型参数,同时对一个单参数能量耗散模型进行了参数标定和分析。数据表明,均匀循环应力模型参数主要受到应力循环幅值的影响,且表现出一定的土体特异性;能量耗散模型的参数则主要受到土体密实度的影响和土体类型的影响。The excess pore pressure induced by seismic loading leads to soil liquefaction.Proper characterization of the pore pressure generation due to cyclic loadings is essential for liquefaction analysis of soils.The results of a series of undrained cyclic triaxial tests based on clean sand and silty sand with fines of 10%are introduced.The data are analyzed in the framework of two pore pressure models(uniform cyclic stress model and energy dissipation model).A new uniform cyclic stress model is proposed to better characterize the pore pressure generation,and the model parameters are calibrated.Meanwhile,a one-parameter energy dissipation model is calibrated and analyzed as well.It is found that the parameters of the uniform cyclic stress model are mainly affected by the amplitude of the stress cycles and mildly affected by the fines content,while the parameters of the energy dissipation model are mainly affected by the packing density and soil type.

关 键 词：土体液化 砂土 超孔隙水压 均匀循环应力模型 能量耗散模型 

分 类 号：TU435[建筑科学—岩土工程]