本文選題：膨脹性泥巖　切入點(diǎn)：互層邊坡　出處：《蘭州交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：受巖性差異的影響，泥巖砂巖互層邊坡風(fēng)化嚴(yán)重，再加上構(gòu)造條件復(fù)雜和膨脹性泥巖特殊的工程性質(zhì)，造成膨脹性泥巖砂巖互層邊坡崩塌破壞模式類型復(fù)雜，國(guó)內(nèi)外對(duì)膨脹性泥巖砂巖互層邊坡的崩塌機(jī)理研究還不夠完善。本文通過一個(gè)具體的工程實(shí)例——312國(guó)道十八里堡水庫(kù)段邊坡崩塌病害整治工程，研究膨脹性泥巖砂巖互層邊坡崩塌的破壞機(jī)理，具體研究?jī)?nèi)容和成果如下： （1）在吸收和借鑒國(guó)內(nèi)外有關(guān)邊坡崩塌研究成果基礎(chǔ)上，總結(jié)了崩塌的分類及破壞模式、崩塌的影響因素。 （2）試驗(yàn)研究了膨脹性泥巖的物理力學(xué)性質(zhì)。對(duì)泥巖試樣進(jìn)行了一系列的試驗(yàn)，重點(diǎn)研究泥巖膨脹力與含水率的關(guān)系，，膨脹率與上部荷載、時(shí)間、含水率的關(guān)系，通過繪制各影響因素與膨脹性能的關(guān)系曲線并對(duì)實(shí)驗(yàn)數(shù)據(jù)進(jìn)行回歸分析，分析研究各影響因素對(duì)泥巖性能的影響，得到了泥巖的物理力學(xué)參數(shù)。 （3）野外勘查結(jié)合室內(nèi)試驗(yàn)分析的泥巖工程特性，從坡體的結(jié)構(gòu)特征開始，依次從崩塌的發(fā)育特征及規(guī)律、崩塌的形成條件、研究區(qū)段內(nèi)的典型崩塌等方面開展研究，定性的提出膨脹性泥巖砂巖互層邊坡的崩塌機(jī)理——拉裂式崩塌。 （4）利用CDEM數(shù)值模擬，分析邊坡在自然狀況、暴雨?duì)顩r、地震狀況下的應(yīng)力場(chǎng)、位移場(chǎng)、塑性剪應(yīng)變及單元破壞情況，研究邊坡三種狀況下的崩塌失穩(wěn)破壞機(jī)理。在考慮結(jié)構(gòu)面和節(jié)理的情況下，采用基于連續(xù)介質(zhì)力學(xué)的離散元方法對(duì)膨脹性泥巖砂巖互層邊坡崩塌的演化過程進(jìn)行再現(xiàn)和分析。 （5）最后綜合野外勘察、室內(nèi)試驗(yàn)和數(shù)值模擬的分析結(jié)果，提出膨脹性泥巖砂巖互層邊坡的崩塌機(jī)理。崩塌破壞過程可以總結(jié)為：泥巖剝落→砂巖裂隙發(fā)展→砂巖局部墜落→崩塌產(chǎn)生。
[Abstract]:Influenced by the difference of lithology, the interbedded mudstone slope weathered seriously, and the complicated structural conditions and the special engineering properties of expansive mudstone resulted in the complicated collapse and failure mode of the interbedded slope of expansive mudstone. The research on collapse mechanism of expansive mudstone interbedded slope at home and abroad is not perfect. The failure mechanism of expansive mudstone interbedded slope is studied. The specific research contents and results are as follows:. 1) on the basis of absorbing and drawing lessons from the research results of slope collapse at home and abroad, the classification and failure mode of collapse and the influencing factors of collapse are summarized. (2) the physical and mechanical properties of expansive mudstone are studied. A series of tests are carried out on the mudstone specimen, with emphasis on the relationship between the swelling force of mudstone and water content, and the relation between expansion rate and upper load, time and moisture content. By drawing the curve of the relationship between the influence factors and the expansion performance and regression analysis of the experimental data, the influence of each influencing factor on the mudstone performance is analyzed and the physical and mechanical parameters of the mudstone are obtained. (3) the characteristics of mudstone engineering analyzed by field exploration and laboratory tests, starting with the structural characteristics of slope body, starting with the development characteristics and rules of collapse, the conditions of formation of collapse, the typical collapse in the study section, etc. The collapse mechanism of expansive mudstone interbedded slope is put forward qualitatively. Using CDEM numerical simulation, the stress field, displacement field, plastic shear strain and element failure of slope under natural condition, rainstorm condition, earthquake condition are analyzed. In this paper, the collapse failure mechanism of slope under three conditions is studied. The evolution process of expansive mudstone interbedded slope collapse is reappeared and analyzed by discrete element method based on continuum mechanics under the consideration of structural plane and joint. Finally, comprehensive field investigation, laboratory tests and numerical simulation results show that the collapse mechanism of expansive mudstone interbedded slope can be summarized as follows: mudstone spalling. 鈫扴andstone fracture development. 鈫扴andstone partial fall. 鈫扖ollapse occurs.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U418.55

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