【摘要】：巖石工程的許多破壞實例都與地下水的作用有關(guān)，而巖質(zhì)邊坡更是與水有密不可分的關(guān)系,據(jù)統(tǒng)計有90%的邊坡破壞是由地下水的直接或者間接作用引起的。因此，在對巖質(zhì)邊坡進行穩(wěn)定性評價時，考慮滲流場與應力場的耦合作用對正確評價巖質(zhì)邊坡穩(wěn)定性具有重要意義。本文在總結(jié)分析當今滲流場與應力場耦合特征和計算模型基礎(chǔ)上，建立等效連續(xù)介質(zhì)數(shù)值模型，以鎮(zhèn)安抽水蓄能電站庫岸邊坡為研究對象，研究了庫水升降引起邊坡滲流作用下坡體的應力應變場特征，進而對邊坡的穩(wěn)定性進行了分析。 本文采用方法及獲得的主要認識如下： （1）總結(jié)了巖體滲透系數(shù)與應力的關(guān)系以及巖體滲流場與應力場的物理模型，并從這兩方面來介紹耦合的特征。 （2）概括了滲流場與應力場耦合的數(shù)學模型，包括等效連續(xù)介質(zhì)模型、裂隙網(wǎng)絡模型、雙重介質(zhì)模型三種。總結(jié)了滲流場與應力場耦合的計算方法：有限單元法與離散單元法，兩種方法各有適用性和局限性。 （3）以鎮(zhèn)安抽水蓄能電站上庫右岸單薄山梁邊坡為研究對象，在研究壩址區(qū)工程地質(zhì)條件基礎(chǔ)上，應用Hoek-Brown經(jīng)驗強度準則對巖體的抗剪強度參數(shù)進行估算，為巖體邊坡穩(wěn)定性分析奠定可靠基礎(chǔ)。 （4）建立等效連續(xù)介質(zhì)數(shù)值模型，研究了在不同庫水位條件下滲流作用對邊坡應力場特征的影響，并對邊坡的穩(wěn)定性進行分析，模擬結(jié)果表明，，對于模擬邊坡來說：①巖體的透水性對滲流的影響顯著，表現(xiàn)為流線在巖體滲透系數(shù)變化的交界處出現(xiàn)明顯的折射或不協(xié)調(diào)現(xiàn)象；隨水位上升，背水坡坡面出現(xiàn)溢流現(xiàn)象；②最大主應力和最小主應力整體受滲流影響不明顯，但局部監(jiān)測點的最大、最小主應力受滲流影響較明顯；滲流對剪應力的影響通過影響有效應力實現(xiàn)的；③滲流不會改變斜坡發(fā)生破壞時的位置，但會使邊坡變形量變大；④庫水位升高，穩(wěn)定系數(shù)下降；庫水位下降，穩(wěn)定系數(shù)上升。
[Abstract]:Many failure examples of rock engineering are related to the action of groundwater, and rock slope is closely related to water. According to statistics, 90% of slope damage is caused by the direct or indirect action of groundwater. Therefore, when evaluating the stability of rock slope, it is very important to consider the coupling effect of seepage field and stress field to evaluate the stability of rock slope correctly. On the basis of summing up and analyzing the coupling characteristics of seepage field and stress field and calculating model, the numerical model of equivalent continuum medium is established in this paper. The bank slope of Zhenan pumped storage power station is taken as the research object. The characteristics of the stress and strain field of the slope under the seepage caused by the rise and fall of the reservoir water are studied, and the stability of the slope is analyzed. The main conclusions obtained in this paper are as follows: (1) the relationship between permeability coefficient and stress of rock mass and the physical model of seepage field and stress field of rock mass are summarized, and the characteristics of coupling are introduced from these two aspects. (2) the mathematical models of coupling seepage field and stress field are summarized, including equivalent continuum model, fracture network model and double medium model. The coupling calculation methods of seepage field and stress field are summarized: finite element method and discrete element method. The two methods have their own applicability and limitation. (3) taking the slope of thin hill beam on the right bank of the upper reservoir of Zhenan pumped Storage Power Station as the research object, based on the study of the engineering geological conditions of the dam site, the shear strength parameters of the rock mass are estimated by using the Hoek-Brown empirical strength criterion. It lays a reliable foundation for the stability analysis of rock slope. (4) the numerical model of equivalent continuum medium is established to study the influence of seepage on the stress field characteristics of slope under different reservoir water levels, and the stability of slope is analyzed. The simulation results show that, For the simulated slope: (1) the permeability of rock mass has a significant effect on seepage flow, which is reflected by the obvious refraction or disharmony of the streamline line at the junction of the rock mass permeability coefficient change; With the rise of water level, there is overflow on the slope surface of backwater slope, 2 the maximum principal stress and the minimum principal stress are not affected obviously by seepage, but the local monitoring point is the largest, and the minimum principal stress is affected by seepage. The influence of seepage on shear stress is realized by effecting effective stress; (3) seepage will not change the position of slope when failure occurs, but it will make the deformation of slope become larger; (4) the water level of reservoir will rise, the coefficient of stability will decrease, the water level of reservoir will decrease, and the coefficient of stability will rise.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TV223.4

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