摘要
提出了联合室内和现场试验综合确定土体本构模型参数的方法。即联合进行室内模拟试验、原位旁压试验和现场大型载荷试验,以E-B模型模拟旁压试验和大型载荷试验过程,采用非线性阻尼最小二乘法和遗传算法最优化理论,依据现场实测旁压试验曲线及大型载荷试验实测土体各点的荷载-位移关系曲线及土体变形分布规律,进行优化反演分析,综合确定土体本构模型参数。从而为考虑土体原位结构性及粒径效应的影响,合理确定覆盖层及大粒径坝料土体的工程力学特性和本构模型参数开辟了新的研究途径。
This paper presents two methods of determining constitutive model parameters of soil by combining laboratory and field tests. Firstly, the two laboratory mechanical test and field test （i. e., insitu pressure meter test and large scale plate loaded test in field）, were performed. Then, the processes of both tests were stimulated numerically, in which a widely used constitutive model such as Duncan Chang E-B model was adopted. Two back-analysis methods were developed by non-linear optimization theories of least squares with damping and genetic algorithm, based on measured curves of pressure vs. volume in pressure meter tests and load vs. displacement at measured points in large-scale plate loading test. Finally, the two methods were applied to a few projects, and the constitutive parameters of soil were determined. The methods can have prospective application in geotechnical engineering.
出处
《中国水利水电科学研究院学报》
2006年第3期220-225,共6页
Journal of China Institute of Water Resources and Hydropower Research
基金
水利部"948"创新项目(CT200407)
关键词
室内试验
旁压试验
大型载荷试验
阻尼最小二乘法
遗传算法
模型参数反演
laboratory test
pressure meter test
large scale plate loading test
least square method with damping
genetic algorithm
back-analysis of constitutive parameter
