【摘要】：巖石工程的許多破壞實(shí)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(jì)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(duì)巖質(zhì)邊坡進(jìn)行穩(wěn)定性評(píng)價(jià)時(shí)，考慮滲流場(chǎng)與應(yīng)力場(chǎng)的耦合作用對(duì)正確評(píng)價(jià)巖質(zhì)邊坡穩(wěn)定性具有重要意義。本文在總結(jié)分析當(dāng)今滲流場(chǎng)與應(yīng)力場(chǎng)耦合特征和計(jì)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(kù)岸邊坡為研究對(duì)象，研究了庫(kù)水升降引起邊坡滲流作用下坡體的應(yīng)力應(yīng)變場(chǎng)特征，進(jìn)而對(duì)邊坡的穩(wěn)定性進(jìn)行了分析。 本文采用方法及獲得的主要認(rèn)識(shí)如下： （1）總結(jié)了巖體滲透系數(shù)與應(yīng)力的關(guān)系以及巖體滲流場(chǎng)與應(yīng)力場(chǎng)的物理模型，并從這兩方面來(lái)介紹耦合的特征。 （2）概括了滲流場(chǎng)與應(yīng)力場(chǎng)耦合的數(shù)學(xué)模型，包括等效連續(xù)介質(zhì)模型、裂隙網(wǎng)絡(luò)模型、雙重介質(zhì)模型三種�？偨Y(jié)了滲流場(chǎng)與應(yīng)力場(chǎng)耦合的計(jì)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(kù)右岸單薄山梁邊坡為研究對(duì)象，在研究壩址區(qū)工程地質(zhì)條件基礎(chǔ)上，應(yīng)用Hoek-Brown經(jīng)驗(yàn)強(qiáng)度準(zhǔn)則對(duì)巖體的抗剪強(qiáng)度參數(shù)進(jìn)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(kù)水位條件下滲流作用對(duì)邊坡應(yīng)力場(chǎng)特征的影響，并對(duì)邊坡的穩(wěn)定性進(jìn)行分析，模擬結(jié)果表明，，對(duì)于模擬邊坡來(lái)說(shuō)：①巖體的透水性對(duì)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(yīng)力和最小主應(yīng)力整體受滲流影響不明顯，但局部監(jiān)測(cè)點(diǎn)的最大、最小主應(yīng)力受滲流影響較明顯；滲流對(duì)剪應(yīng)力的影響通過(guò)影響有效應(yīng)力實(shí)現(xiàn)的；③滲流不會(huì)改變斜坡發(fā)生破壞時(shí)的位置，但會(huì)使邊坡變形量變大；④庫(kù)水位升高，穩(wěn)定系數(shù)下降；庫(kù)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(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TV223.4

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