沥青混凝土心墙堆石坝应力变形有限元分析

摘要

Based on the elliptic-parabolic double yield surface model, the three-dimensional finite element analysis of an asphalt concrete core earth-rock dam is carried out, and the stress and deformation characteristics of the dam during the completion and storage periods are studied.The results show that the maximum settlement of dam body is 50.68 cm under completion storage, which accounts for the 0.4 percent of the maximum dam height.The maximum settlement of dam body is 50.5 cm under water storage, which accounts for the 0.397 percent of the maximum dam height.The horizontal displacement along river is less.Among them, the maximum horizontal displacement toward downstream is 5.58 cm and the maximum horizontal displacement toward upstream is 4.5 cm under completion storage and the maximum horizontal displacement toward upstream is 8.5 cm under water storage.The laws of distribution of principal stress are similar between under completion storage and under water storage and there exist some arc effect of core wall under both completion storage and water storage.The minor principal stresses of core wall are all greater than zero, which means there is no tensile stress.On the whole, the stress level of dam body is not high.%利用椭圆-抛物双屈服面模型,对某沥青混凝土心墙土石坝进行三维有限元计算分析,研究了坝体在竣工期、蓄水期坝体的应力变形特性.计算结果表明:坝体竣工期最大沉降为50.86cm,占最大坝高(包括覆盖层,计69m)0.4％.坝体蓄水期最大值为50.5m,占最大坝高0.397％.顺河向水平位移较小.其中,竣工期向下游水平最大位移为5.58cm,向上游水平最大位移为4.5cm.蓄水期向上游水平最大位移为8.5cm.竣工期和蓄水期坝体大主应力分布规律相似,且竣工期和蓄水期均存在心墙拱效应.心墙小主应力均大于零,即没有出现拉应力.竣工期和蓄水期坝体的应力水平均不高.