考虑参数空间变异性的隧道下穿建筑物安全性评价

发布时间：2018-06-07 15:46

本文选题：隧道 + 随机场　；参考：《岩土工程学报》2017年S2期

【摘要】：考虑土性参数的空间变异性,构建了基于随机场理论和数值分析手段的隧道下穿建筑物安全概率评价方法。将土体参数弹性模量视为随机场模型,采用应力释放方法模拟隧道施工,并基于地表建筑物为柔性简支梁的假设,利用极限拉应变作为判定指标对建筑物安全进行概率性评价。结果表明,所提出方法能够在考虑土性参数空间变异性的前提下有效地评价隧道下穿建筑物的安全性。土体弹性模量变异系数和自相关距离对隧道下穿建筑物安全性具有显著的影响;弹性模量的变异程度越高造成建筑物内最大拉应变的概率分布越离散,达到较高破坏等级的概率也越大。
[Abstract]:Considering the spatial variability of soil parameters, a probabilistic evaluation method of tunnel underpass building safety based on random field theory and numerical analysis method is proposed. The elastic modulus of soil is regarded as a random field model, and the stress release method is used to simulate the tunnel construction. Based on the assumption that the surface building is a flexible simply supported beam, the ultimate tensile strain is used as the criterion to evaluate the safety of the building probabilistically. The results show that the proposed method can effectively evaluate the safety of the tunneling buildings under the tunnel considering the spatial variability of soil parameters. The coefficient of variation of elastic modulus of soil and the autocorrelation distance have significant effects on the safety of buildings under the tunnel, and the higher the variation of elastic modulus, the more discrete the probability distribution of the maximum tensile strain in the building. The higher the probability of reaching a higher level of destruction.
【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;中国科学院大学;
【基金】：中国科学院科技服务网络计划(STS)(KFJ-EW-STS-122)
【分类号】：U455

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