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在对胶凝砂砾石材料力学性能指标搜集、整理、统计和分析的基础上,建立弹性模量随机场模型,运用Monte-Carlo随机有限元法研究材料非均质性对大坝静力工作性态的影响。计算结果表明:特征点位移离散性较小,变幅最大不超过13.7%;应力离散性较大,变幅最小不低于18.8%,最大可达110.5%;坝体应力和位移取统计均值后分布规律与材料均质确定性模型下基本一致;坝体应力和位移离散性在上下游面、顶部、坝踵和坝趾处较大,变异系数最大达到0.21,而内部则较小,变异系数不超过0.08;在均值上下三倍标准差区间内,位移极值点处变化率不超过5%,而应力极值点处变化率不小于18.4%,最大达到375%。
Based on the collection, collation, statistics and analysis of the mechanical properties of cemented sand and gravel materials, a random field model of elastic modulus was established, and Monte-Carlo stochastic finite element method was used to study the effect of material heterogeneity on the dam static workability State influence. The calculated results show that the discrete displacement of the characteristic points is small, the maximum amplitude does not exceed 13.7%, the stress dispersion is large, the minimum amplitude is not less than 18.8% and the maximum is 110.5% The distribution law is basically consistent with the material homogeneity deterministic model. The discreteness of stress and displacement of the dam body is larger at the upstream and downstream surfaces, at the top, at the heel and at the toe, with the maximum coefficient of variation reaching 0.21 and the interior being smaller, and the coefficient of variation No more than 0.08; within the range of three times of standard deviation, the rate of change at the extreme point of displacement does not exceed 5%, while the rate of change at the extreme point of stress is not less than 18.4% and the maximum reaches 375%.