软基处理工程的有限元数值模拟  

SIMULATION OF TREATMENT OF SOFT CLAY FOUNDATION BY FEM METHOD

作　　者：魏宁[1] 茜平一[2] 张波 程小俊 

机构地区：[1]武汉大学土木建筑工程学院,湖北武汉430072 [2]广东水利电力职业技术学院,广东广州510635 [3]长江水利委员会,湖北武汉430010 [4]深圳市勘察测绘院有限公司,广东深圳518028

出　　处：《岩石力学与工程学报》2005年第A02期5789-5794,共6页Chinese Journal of Rock Mechanics and Engineering

摘　　要：利用土体非线性弹–粘弹本构模型和流变的遗传记忆理论,并结合江西武山铜矿尾矿坝软基处理实践,运用Biot固结有限元分析方法对工程的初期土石坝进行了数值模拟和预测,分析固结过程中地基中孔隙水压力、位移随时间的变化规律。实测期内,模拟与实测资料较为接近。对尾矿坝初期堆石坝的运行情况进行了预测,分析坝基固结接近完成时,坝身和坝基的应力、位移、应力水平情况,分析结果表明:初期堆石坝的长期运行是安全的。并比较了考虑流变和不考虑流变的情形,分析了流变现象对尾矿坝初期坝的影响。该数值分析对工程实践有一定指导意义。Tailing dam No. 1 of Wushan copper mining is located in Jiangxi province China. The first stage of the tailing dam is the rock-fill dam prected on the soft clay foundation. The treatment of soft clay foundation and the schedule to build rock-fill dam are interpreted briefly. With the development of calculation techniques, the numerical method for consolidation problem has been widely used in engineering practice with satisfying results. Based on soil parameters gained from experiment, back analysis is used to adjust those parameters. By using nonlinear elastic rheology constitutive model and Boltzman inheritance method, the soft clay foundation of tailing dam treated by plastic board is simulated by finite element method （FEM）. Comparing numerical results with observation by the displacements of the foundation, those calculated results have a good agreement with those observed results. Based on numerical results, relationships between pore pressure of foundation and time, the displacement of foundation and time, are analyzed. The stress, displacement, and stress state of the rock-fill dam are displayed by some graphs. Some valuable results are derired from those graphs. Condition with creep model and condition without are compared~ and the effect on the soft clay foundation is analyzed. The model and those adjusted soil parameters are used to predict the safety state of the rock-fill dam. Numerical simulation proves that the rock-fill dam is safe in the long run and those results gained by numerical method may provide reference to engineering practice.

关 键 词：土力学 固结 有限元方法 流变 尾矿坝 粘弹性 

分 类 号：TU472[建筑科学—结构工程]