土石坝心墙应力变化对渗透系数的影响研究

发布时间：2018-04-26 07:05

本文选题：渗透性能 + 应力分布　；参考：《人民长江》2017年19期

【摘要】：试验和现场监测均表明,土石坝心墙的渗透系数并非是一个常数,而是随着其应力状态和密度的变化呈一定的空间分布。一般而言,心墙土在填筑过程中渗透系数的空间变化因自重荷载大小而产生,密度大的下层土渗透系数小于上层土;不同应力状态下,渗透系数也有一定规律。根据某土石坝心墙土料的等向压缩试验确定心墙各高程处的实际密度,基于该土料在不同密度条件下的渗透系数试验成果,确定各高程处心墙的实际渗透系数。考虑上述土料渗透系数的空间变化后,开展心墙孔压、应力状态的有限元数值模拟。将该结果与常规心墙采用单一渗透系数的计算方法对比发现,考虑心墙渗透系数的空间分布,能够更合理地反映心墙的实际孔压分布和应力状态。
[Abstract]:Both the test and field monitoring show that the permeability coefficient of the core wall of earth-rock dam is not a constant, but with the change of stress state and density, it has a certain spatial distribution. Generally speaking, the spatial variation of permeability coefficient of the core wall soil in the course of filling is caused by the size of self-weight load, the permeability coefficient of the lower layer with high density is smaller than that of the upper soil, and the permeability coefficient also has certain regularity under different stress states. According to the isotropic compression test of the core wall soil material of a certain earth-rock dam, the actual density of each height of the core wall is determined. Based on the experimental results of the permeability coefficient of the soil material under different density conditions, the actual permeability coefficient of the core wall at each elevation is determined. Considering the spatial variation of soil permeability coefficient, finite element numerical simulation of pore pressure and stress state of core wall is carried out. It is found that considering the spatial distribution of the permeability coefficient of the core wall, the actual pore pressure distribution and stress state of the core wall can be more reasonably reflected by comparing the results with the calculation method of the single permeability coefficient of the conventional core wall.
【作者单位】：华北电力大学可再生能源学院;中国水利水电科学研究院流域水循环模拟与调控国家重点实验室;
【分类号】：TV223.4;TV641

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