考虑温度效应软黏土累积塑形应变模型及验证

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英文篇名：Accumulative Plastic Strain Model of Soft Clay Considering Temperature Effect and Its Verification 作者：朱瑶宏 ; 刘干斌 ; 谢琦峰 ; 郑荣跃 英文作者：ZHU Yaohong;LIU Ganbin;XIE Qifeng;ZHENG Rongyue;Institution of Geotechnical Engineering, Ningbo University; 关键词：温度 ; 软黏土 ; 累积塑性应变 ; 预测模型 英文关键词：temperature;;soft clay;;accumulative plastic strain;;prediction model 中文刊名：ZBDZ 英文刊名：China Earthquake Engineering Journal 机构：宁波大学岩土工程研究所; 出版日期：2019-07-18 出版单位：地震工程学报 年：2019 期：v.41 基金：国家自然科学基金资助项目(51478228、51778303) 语种：中文; 页：ZBDZ201904012 页数：8 CN：04 ISSN：62-1208/P 分类号：81-87+141

摘要

通过对宁波饱和软黏土开展应力控制循环三轴试验,研究了不同温度、动应力、初始偏应力、围压作用对累积塑性应变的影响。在试验的基础上,引入综合影响参数对试验数据进行归一化,建立饱和软黏土累积塑性应变的双曲线模型,并基于动态平衡的假设,建立了长期动荷载作用下饱和软黏土达到平衡状态后的归一化累积塑性应变预测模型及考虑温度影响的考虑温度影响的归一化累积塑性应变预测模型,模型预测值与试验结果吻合性较好,可以为轨道交通设计和施工提供参考。
        According to the cyclical triaxial tests for the stress control of saturated soft clay in Ningbo area, the effects of the same temperature, dynamic stress, initial deviatoric stress, and confining pressure on the cyclic softening characteristics of saturated soft clay were studied. Based on the test, the data were normalized by introducing comprehensive influence parameters. A hyperbolic model of the cumulative plastic strain in saturated soft clay was established. Based on the assumption of dynamic equilibrium, the normalized cumulative plastic strain prediction model considering the temperature effect under the action of the long-term dynamic load was established, and the predicted values of the model agree well with the experimental results. The proposed model can provide a reference for the design and construction of rail transit.

引文

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