高承压锯齿型富水夹泥断裂渗流演化规律研究

发布时间：2018-09-04 06:35

【摘要】：近些年来,伴随着国家经济的飞速发展,地铁以及大量基础设施得到大力建设,与此同时,大量岩体工程的开工建设项目也发展起来。由于岩体中存在大量的裂隙以及充填物,岩体力学性能和渗透性能具有不确定性。同时,人工干扰则会导致岩体内地应力和水压力重新分布。在新建的各种隧道以及巷道中突水现象屡见不鲜,裂隙中的渗流贯通成为危害岩体开挖安全的关键因素。岩体中富水夹泥断裂渗流演化规律的研究与围岩安全和施工安全密切相关,目前也是国内外研究的难点以及重点。为研究富水夹泥断裂岩体渗流演化规律,本文采用相似材料试验,三维节理渗流试验系统以及COMSOL Multiphysics有限元分析软件,分别采用物理试验和数值计算等手段,主要进行了以下研究工作:(1)通过改变水灰比的方法,研究相似材料的物理力学性能以及渗透性能,以确定模型试验中岩体相似材料的配比。(2)采用模型试验,揭示了锯齿型富水夹泥断裂岩体内孔隙水压力的空间和时间动态演化过程,分析了节理充填物和岩体材料对孔隙水压力动态演化过程和变化速率的影响,采用“相邻测点”法考察了节理岩体水力梯度变化规律。(3)依据模型试验的模型,建立COMSOL Multiphysics的有限元分析模型,分别研究节理同锯齿夹角、渗透系数、不同开度、岩体不同渗透系数不同围压下的带锯齿夹角节理的渗流演化特征、孔隙水压力等值面变化规律、孔隙水流线演化规律。
[Abstract]:In recent years, with the rapid development of national economy, subway and a large number of infrastructure have been vigorously built, at the same time, a large number of rock mass engineering construction projects have also developed. The mechanical properties and permeability of rock mass are uncertain due to the large number of cracks and fillings in rock mass. At the same time, artificial interference will lead to the redistribution of geostress and water pressure. The phenomenon of water inrush is common in newly built tunnels and roadways. Seepage and penetration in fractures are the key factors that endanger the safety of rock mass excavation. The study of seepage evolution law of water-rich mud-filled faults in rock mass is closely related to the safety of surrounding rock and construction, and it is also a difficult point and focus of research at home and abroad. In order to study the law of seepage evolution of water-rich mud-filled fractured rock mass, similar material test, three-dimensional jointed seepage test system and COMSOL Multiphysics finite element analysis software are adopted in this paper, physical test and numerical calculation are used respectively. The main works are as follows: (1) by changing the water-cement ratio, the physical and mechanical properties and permeability of the similar materials are studied to determine the ratio of the similar materials in the model test. (2) the model test is adopted. The spatial and temporal dynamic evolution process of pore water pressure in sawtooth water-rich mud-filled faulted rock is revealed, and the influence of joint filling and rock mass material on the dynamic evolution process and change rate of pore water pressure is analyzed. The variation law of hydraulic gradient of jointed rock mass is investigated by using the method of "adjacent measuring points". (3) according to the model of model test, the finite element analysis model of COMSOL Multiphysics is established to study the angle of joint and serrated tooth, permeability coefficient, different opening degree, respectively. The characteristics of seepage evolution of joints with sawtooth angle under different permeability coefficients and confining pressures, the variation law of pore water pressure equivalent surface and the evolution law of pore flow line.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU45

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