复杂荷载作用下饱和钙质砂孔压特性及损耗能试验研究  

Experimental study on characteristics of pore water pressure and dissipated energy of saturated calcareous sand under complex loading conditions

作　　者：李宝建 王哲[2] 吕国儿 潘坤 杨仲轩[3] 龚晓南[3] LI Baojian;WANG Zhe;LÜGuoer;PAN Kun;YANG Zhongxuan;GONG Xiaonan(PowerChina Huadong Engineering Corporation Limited,Hangzhou 311122,China;College of Civil Engineering,Zhejiang University of Technology,Hangzhou 310014,China;Department of Civil Engineering,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]中国电建集团华东勘察设计研究院有限公司,浙江杭州311122 [2]浙江工业大学土木工程学院,浙江杭州310014 [3]浙江大学建筑工程学院,浙江杭州310058

出　　处：《岩土工程学报》2023年第S02期37-41,共5页Chinese Journal of Geotechnical Engineering

基　　金：浙江省博士后科研择优资助项目(ZJ2022012);国家自然科学基金项目(52178362);浙江省自然科学基金项目(LY23E080009)。

摘　　要：钙质砂是一种由海洋生物残骸沉积而成的特殊岩土体,为我国南海岛礁主要的吹填材料,研究其动力特性意义重大。通过一系列不排水循环剪切三轴试验,分析饱和钙质砂孔压特性发展规律;引入能量法,建立钙质砂孔压和损耗能的内在联系。结果表明,饱和钙质砂的极限残余孔压比随固结应力比呈先增大后减小的变化趋势,循环加载过程所累积的损耗能与试样初始静剪应力比及相对密实度有关,受循环应力比影响极小,可通过构建的能量模型较好地预测不同试验条件下饱和钙质砂的损耗能。研究成果能为钙质砂地基的稳定性分析提供理论依据和技术支撑。Calcareous sand,the special soil,is the main material for the filling of islands and reefs in the South China Sea,which is biogenic sediments and skeletal remains of marine organisms.It is of great importance to study its dynamic characteristics.By a series of undrained cyclic triaxial tests on the calcareous sand,the characteristics of pore water pressure are investigated.Besides,the energy method is used to establish the relation between the pore water pressure and the dissipated energy.The results show that the ultimate residual pore pressure ratio of the saturated calcareous sand increases first and then decreases with the change of consolidation stress ratio.The accumulated dissipated energy during cyclic loading is related to the initial static shear stress ratio and relative density of the sample,and has few influences on the cyclic stress ratio.The dissipated energy of the saturated calcareous sand under different test conditions can be predicted by the energy model.The research provides theoretical basis and technical support for the stability analysis of calcareous sand foundations.

关 键 词：钙质砂 孔压特性 损耗能 初始静剪应力 相对密实度 

分 类 号：TU435[建筑科学—岩土工程]