论文部分内容阅读
通过对一个100 m高典型硬填料坝的应力变形分析,指出坝体填筑过程和硬填料随龄期和应力状态变化的应力-应变特征的模拟对坝体应力变形结果影响显著不容忽略。采用二元本构模型和仿真计算方式,研究了地基弹性模量对坝体应力和强度安全性的影响。地基的变形对坝体应力有显著的影响。地基弹模较低时与较刚性地基的坝体应力情况差异很大。地基弹模较低时,竣工期坝基面中部的拉应力和坝址与坝踵处的压应力都很大,可能并不满足抗拉和抗压强度。与竣工期相比,挡水期坝基面的压应力增加,拉应力减小,抗压强度安全性减小,抗拉强度安全性增加。对于硬填料坝,竣工期和挡水期的抗剪强度安全系数均很高,一般可不进行抗剪强度的计算。
Based on the analysis of stress and deformation of a typical 100m high hardfill dam, it is pointed out that the simulation of stress-strain characteristics of the dam body filling process and the change of hardfill with age and stress state can not neglect the stress and strain of the dam body. Using binary constitutive model and simulation method, the influence of the elastic modulus of the foundation on the stress and strength safety of the dam is studied. The deformation of the foundation has a significant impact on the dam stress. When the foundation modulus is lower, the stress condition of the dam body is different from that of the more rigid foundation. When the elastic modulus of foundation is low, the tensile stress in the middle part of dam foundation and the compressive stress at dam site and dam heel are great at the completion stage, which may not satisfy the tensile strength and compressive strength. Compared with the completion, the compressive stress on the dam foundation surface during the water retaining period increases, the tensile stress decreases, the compressive strength safety decreases, and the tensile strength safety increases. For hard-fill dam, the safety factor of shear strength during the completion and the water-retaining period is very high, and the calculation of the shear strength can not be carried out.