本文選題：降雨 + 入滲　； 參考：《大連理工大學(xué)》2014年碩士論文

【摘要】：降雨對邊坡穩(wěn)定性研究是國內(nèi)外巖土工程界十分關(guān)注的一個重要課題。特別是在我國西南地區(qū),由于降雨較多、降雨強(qiáng)度大,經(jīng)常發(fā)生滑坡、泥石流等自然災(zāi)害。所以說,降雨與邊坡失穩(wěn)破壞密不可分,對其研究勢在必行。當(dāng)發(fā)生強(qiáng)降雨,邊坡更容易失穩(wěn)破壞,這是顯而易見的常識,研究邊坡在降雨前后的穩(wěn)定性變化問題是當(dāng)務(wù)之急。四川省大崗山大渡河水電站位于西南地區(qū),右岸邊坡比較高陡,地下水位較低,而且屬于巖質(zhì)邊坡,夏季雨水較多,比較容易發(fā)生滑坡災(zāi)害。因此,研究降雨入滲對其右岸巖質(zhì)邊坡穩(wěn)定性影響是非常重要的課題。本文研究重點是分析降雨如何影響右岸邊坡的穩(wěn)定性,通過折減巖體的參數(shù),從而研究安全系數(shù)的變化,用安全系數(shù)來衡量降雨對巖質(zhì)邊坡穩(wěn)定性的影響。本文從以下幾個方面進(jìn)行分析研究： (1)基于裂隙巖質(zhì)邊坡滲流理論,建立了巖質(zhì)邊坡數(shù)值模型。 (2)從物理、化學(xué)以及力學(xué)作用上研究降雨對巖質(zhì)邊坡巖體強(qiáng)度的影響,雨水入滲后孔隙水壓力對巖體應(yīng)力狀態(tài)的影響形式等。 (3)研究邊坡穩(wěn)定性的方法,包括求安全系數(shù)大小衡量邊坡穩(wěn)定性；FLAC3D軟件可以用來計算邊坡穩(wěn)定性安全系數(shù)以及滲流方面的問題。邊坡豎向位移、剪切破壞單元的范圍、塑性貫通區(qū)的大小都是衡量邊坡失穩(wěn)的要素。掌握邊坡失去穩(wěn)定的機(jī)理及力學(xué)解釋,為對邊坡進(jìn)行治理和防護(hù)打下基礎(chǔ)。 (4)考慮巖質(zhì)邊坡在不同降雨強(qiáng)度、降雨持續(xù)時間以及不同滲透系數(shù)情況下邊坡穩(wěn)定問題；利用不同的分析方法,求取的安全系數(shù)并不相同；實例分析大崗山邊坡巖體物理力學(xué)參數(shù)變化,包括內(nèi)摩擦角、粘聚力、巖體容重、彈性模量的變化與安全系數(shù)的關(guān)系。 降雨是誘發(fā)邊坡失穩(wěn)的主要因素。降雨入滲過程中,發(fā)生飽和-非飽和滲流過程,滲流場在降雨持續(xù)時時刻變化,滲流場與應(yīng)力場共同決定著邊坡穩(wěn)定性。孔隙水壓力的存在對含裂隙巖體強(qiáng)度有劣化的影響,通過對裂隙巖體的內(nèi)摩擦角、粘聚力、容重、彈性模量等折減,求出安全系數(shù)減小,得出降雨是誘發(fā)巖質(zhì)邊坡失去穩(wěn)定的主要因素。
[Abstract]:Research on slope stability caused by rainfall is an important subject in geotechnical engineering at home and abroad. Especially in the southwest of China, due to more rainfall, heavy rainfall, landslides, debris flow and other natural disasters occur frequently. Therefore, rainfall and slope failure are inseparable, it is imperative to study it. When strong rainfall occurs, slope is more vulnerable to instability and failure, which is an obvious common sense. It is urgent to study the stability of slope before and after rainfall. Dadu River Hydropower Station in Dagangshan, Sichuan Province is located in southwest China. The right bank slope is relatively high and steep, the groundwater level is low, and it belongs to rock slope. There is more Rain Water in summer, so it is easy to happen landslide disaster. Therefore, it is very important to study the influence of rainfall infiltration on the stability of rock slope on the right bank. The emphasis of this paper is to analyze how rainfall affects the stability of the slope on the right bank. By reducing the parameters of rock mass, the change of safety factor is studied, and the influence of rainfall on the stability of rock slope is measured by the factor of safety. Based on the seepage theory of fractured rock slope, a numerical model of rock slope is established in this paper. The influence of rainfall on rock mass strength and the influence of pore water pressure on rock mass stress state after Rain Water infiltration are studied in chemistry and mechanics. FLAC3D software can be used to calculate the safety factor of slope stability and seepage problems. The vertical displacement of slope, the range of shear failure element, and the size of plastic through zone are all factors to measure the slope instability. Grasp the mechanism of slope instability and mechanical interpretation, for slope treatment and protection of the foundation. 4) consider the rock slope under different rainfall intensity, rainfall duration and different permeability coefficient of slope stability; The variation of physical and mechanical parameters of rock mass in Dagangshan slope is analyzed by using different analysis methods, including the relationship between the variation of internal friction angle, cohesion, bulk density of rock mass, elastic modulus and safety factor. Rainfall is the main factor that induces slope instability. In the process of rainfall infiltration, saturated-unsaturated seepage occurs, and the seepage field changes at the time of continuous rainfall, and the seepage field and stress field jointly determine the slope stability. The existence of pore water pressure has an effect on the strength of fractured rock mass. By reducing the angle of internal friction, cohesion, bulk density and elastic modulus of fractured rock mass, the safety factor is obtained. It is concluded that rainfall is the main factor inducing rock slope to lose stability.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU45

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