| 软土非线性蠕变压缩模型 |
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| 引用本文： | 王常明,陈英姿,张淑华.软土非线性蠕变压缩模型[J].吉林大学学报(地球科学版),2004,34(3):420-424. |
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| 作者姓名： | 王常明 陈英姿 张淑华 |
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| 作者单位： | 吉林大学,建设工程学院,吉林,长春,130026;浙江长城建设集团股份有限公司,浙江,杭州,310009;长春工业大学,现代教育技术学院,吉林,长春,130012 |
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| 基金项目： | 国家自然科学基金
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吉林大学校科研和教改项目 |
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| 摘 要： | 从土的力学行为与微观结构相结合的途径探讨滨海软土单向压缩的本构特征,旨在构造一个用于软土一维变形计算的合理形式.据多级加荷压缩试验成果,进一步证明了软土具有非线性蠕变特性;并用幂函数描述了软土压缩蠕变规律,用割线模量法概化了单向压缩的应力-应变的关系.提出了压缩蠕变率(CCR)的概念,并建立与土的结构定量参数(定向概率熵和孔隙分布分维数)、应力比之间的幂函数关系.在此基础上,建议了一个考虑非线性蠕变特性的单向压缩本构模型,并用试验资料初步验证了模型的有效性.建议的模型具有参数少、简便实用之特点,可用于软土地基的沉降计算分析.
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| 关 键 词： | 滨海软土 压缩蠕变率 非线性 结构定量分析 单向压缩 |
| 文章编号： | 1671-5888(2004)03-0420-05 |
| 修稿时间： | 2003年10月6日 |
A one-dimesional compression model considering nonlinear creep characteristics of marine soft soil |
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| WANG Chang-ming,CHEN Ying-zi,ZHANG Shu-hua.A one-dimesional compression model considering nonlinear creep characteristics of marine soft soil[J].Journal of Jilin Unviersity:Earth Science Edition,2004,34(3):420-424. |
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| Authors: | WANG Chang-ming CHEN Ying-zi ZHANG Shu-hua |
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| Institution: | WANG Chang-ming~1,CHEN Ying-zi~2,ZHANG Shu-hua~3 |
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| Abstract: | This paper discussed the compression-creep constitutive characteristics of marine soft soil by combining the mechanical behaviour and its microstructure. The objective is to construct a reasonable and simplified constitutive relation to depict the compression-creep behavior. Based on creep test data of three types of soils from different areas, a power-typed relation is generalized to describe creep curves and a hyperbolic typed stress-strain relation for compression is proposed by means of secant modulus method (SMM). As a synthetic parameter, compression-creep rate(CCR) can be used to describe the characteristics of compression-creep. CCR have a relation to magnitude of stress, stress history and soil structure. The relationship between CCR and structure parameters H _(m)and D_(fp), which represent the entropy of orientation probability of structural units and void distribution of soil, respectively, is discussed by microstructure quantitative analysis method (SQAM). At last, a simplified constitutive model for depicting the compression-creep behavior of marine soft soils is suggested and it is verified by test data from laboratory. |
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| Keywords: | marine soft soil compression-creep rate nonlinear structure quantitative analysis one-dimensional compression |
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