蒸汽凝水滴渗诱发的一个非饱和黄土滑坡机理研究
发布时间:2018-06-17 16:18
本文选题:非饱和黄土 + 滑坡 ; 参考:《水文地质工程地质》2017年04期
【摘要】:2010年10月21—22日,陕西延炼厂区储油罐下方的斜坡发生缓慢滑移,造成了巨大的经济损失。滑坡发生前当地没有降雨或地震,为探究其形成过程,在边坡上取代表性土样进行土水特征曲线测试、配制不同含水率土样,进行常规三轴试验和直剪试验,以确定土体的非饱和渗透曲线和强度参数。建立边坡滑动前的有限元模型,进行非饱和渗透与非饱和强度的耦合分析,得到凝结水入渗过程中边坡的应力场,据此可得不同时间段的边坡稳定系数,揭示其破坏过程。结果表明,水蒸气凝结水在斜坡内长期滴渗,使得坡体地下水位缓慢上升,地下水位浸润潜在滑面前,稳定系数基本不变,待地下水位开始浸润边坡潜在滑面时,稳定系数开始迅速降低,最终导致斜坡破坏。
[Abstract]:On October 21-22, 2010, the slope beneath the oil storage tank in Shaanxi Yancheng Refinery area slid slowly, causing huge economic losses. There was no rainfall or earthquake before the landslide occurred. In order to investigate its formation process, the representative soil samples were taken on the slope to test the soil water characteristic curve, the soil samples with different moisture content were prepared, and the routine triaxial test and direct shear test were carried out. In order to determine the unsaturated permeability curve and strength parameters. The finite element model of slope before sliding is established, and the coupling analysis of unsaturated permeability and unsaturated strength is carried out, and the stress field of the slope in the process of condensate infiltration is obtained. According to this model, the slope stability coefficient in different time periods can be obtained and the failure process can be revealed. The results show that the seepage of water vapor condensate in the slope for a long time makes the groundwater level rise slowly, and the coefficient of stability is basically unchanged when the groundwater level begins to infiltrate the potential slip surface of the slope, and when the groundwater level begins to infiltrate the potential slip surface of the slope, The coefficient of stability began to decrease rapidly and eventually resulted in slope failure.
【作者单位】: 长安大学地质工程与测绘学院;
【基金】:国家自然科学基金项目(41372329,41502286) 国家重点基础研究发展计划资助(973计划)(2014CB744701)
【分类号】:P642.22
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