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Volume change behavior of unsaturated soils under non-isothermal conditions

ISSN号：1001-6538
期刊名称：Chinese Science Bulletin
时间：2011.8.8
页码：2495-2504
分类：TU43[建筑科学—岩土工程;建筑科学—土工工程] S152.72[农业科学—土壤学;农业科学—农业基础科学]
作者机构：[1]Department of Geotechnical and Geoenvironmental Engineering, School of Civil Engineering and Architecture, Beijing Jiaotong University,Beijing 100044, China
相关基金：This work was supported by the National Natural Science Foundation of China （51078019）, the National Basic Research Program of China （2010CB732100）, Beijing Municipal Natural Science Foundation （8112024） and the Basic Research Funds for the Central Universities （2011YJS043）.
相关项目：基于连续孔隙介质土力学理论研究非饱和土的本构关系

作者： Cai GuoQing|Zhao ChengGang|Liu Yan|Li Jian|

关键词：非饱和土, 非等温条件, 高放射性废物处置库, 弹塑性本构模型, 行为, 体积, 状态变量, 耦合模型, unsaturated soils, temperature influence, deformation properties, constitutive model

中文摘要：

与设计象地热的资源的高级放射性的浪费仓库，利用和利用的构造那样的惯例的现代 geotechnical 的发展，节省精力的大楼和 CO2 的地下的存储，对不饱和的土壤的基本机械性质上的温度的影响的研究国际性地成为了重要的期。由使用工作表达式并且在不饱和的土壤的基本性质上考虑温度的影响，平均土壤骨骼压力，修改的吸和温度在热力学和土壤骨骼紧张作为概括力量的州的变量被选择，当概括流动的州的变量结合到概括力量的变量，浸透和熵被选择。把联合模型基于非线性的多地并且由使用存在试验性的结果，在非等温的条件下面的不饱和的土壤的一个有弹性塑料的组成的模型被开发在不饱和的土壤的变丑性质上分析温度的影响。模型被用来在各向同性的条件下面在不饱和的土壤的变丑性质上预言并且分析吸和温度的影响，并且成功地用试验性的结果被验证。

英文摘要：

With the development of modern geotechnical engineering practices such as the construction of high level radioactive waste repositories, exploitation and utilization of geothermal resources, energy-saving buildings and underground storage of CO2, research into the influence of temperature on the basic mechanical properties of unsaturated soils has become an important issue interna- tionally. By using the work expression and considering the influence of temperature on the basic properties of unsaturated soils, the average soil skeleton stress, modified suction and temperature were selected as state variables of generalized forces in ther- modynamics and the soil skeleton strain, saturation and entropy were chosen as state variables of generalized flows conjugate to the variables of generalized forces. Based on the nonlinear mtdti-field coupled model and by using existing experimental results, an elastic-plastic constitutive model of unsaturated soils under non-isothermal conditions was developed to analyze the influence of temperature on the deformation properties of unsaturated soils. The model was used to predict and analyze the influence of suction and temperature on the deformation properties of unsaturated soils under isotropic conditions, and was successfully veri- fied using experimental results.

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