發(fā)布時間：2018-09-04 06:35

【摘要】：近些年來,伴隨著國家經(jīng)濟的飛速發(fā)展,地鐵以及大量基礎(chǔ)設(shè)施得到大力建設(shè),與此同時,大量巖體工程的開工建設(shè)項目也發(fā)展起來。由于巖體中存在大量的裂隙以及充填物,巖體力學(xué)性能和滲透性能具有不確定性。同時,人工干擾則會導(dǎo)致巖體內(nèi)地應(yīng)力和水壓力重新分布。在新建的各種隧道以及巷道中突水現(xiàn)象屢見不鮮,裂隙中的滲流貫通成為危害巖體開挖安全的關(guān)鍵因素。巖體中富水夾泥斷裂滲流演化規(guī)律的研究與圍巖安全和施工安全密切相關(guān),目前也是國內(nèi)外研究的難點以及重點。為研究富水夾泥斷裂巖體滲流演化規(guī)律,本文采用相似材料試驗,三維節(jié)理滲流試驗系統(tǒng)以及COMSOL Multiphysics有限元分析軟件,分別采用物理試驗和數(shù)值計算等手段,主要進行了以下研究工作:(1)通過改變水灰比的方法,研究相似材料的物理力學(xué)性能以及滲透性能,以確定模型試驗中巖體相似材料的配比。(2)采用模型試驗,揭示了鋸齒型富水夾泥斷裂巖體內(nèi)孔隙水壓力的空間和時間動態(tài)演化過程,分析了節(jié)理充填物和巖體材料對孔隙水壓力動態(tài)演化過程和變化速率的影響,采用“相鄰測點”法考察了節(jié)理巖體水力梯度變化規(guī)律。(3)依據(jù)模型試驗的模型,建立COMSOL Multiphysics的有限元分析模型,分別研究節(jié)理同鋸齒夾角、滲透系數(shù)、不同開度、巖體不同滲透系數(shù)不同圍壓下的帶鋸齒夾角節(jié)理的滲流演化特征、孔隙水壓力等值面變化規(guī)律、孔隙水流線演化規(guī)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.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU45

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