本文關(guān)鍵詞： 邊坡 數(shù)值模擬 π定理 滲流 耦合分析　出處：《武漢科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著國家對(duì)基礎(chǔ)建設(shè)投資的加大，大量巖土工程問題隨之涌現(xiàn)。其中，邊坡與基坑的穩(wěn)定性問題更加突出。特別是沿海地區(qū)，工程巖土體受地下水滲流的影響，大量邊坡失穩(wěn)事故的產(chǎn)生都是由于地下水的作用。研究地下水滲流對(duì)邊坡穩(wěn)定性的影響有較大的實(shí)際意義。 選取邊坡的典型剖面，運(yùn)用FLAC3D軟件進(jìn)行建模與計(jì)算，通過應(yīng)力和位移云圖分析邊坡穩(wěn)定性情況。通過改變地下水位，計(jì)算分析邊坡穩(wěn)定性變化情況，探討地下水對(duì)邊坡的影響機(jī)理和作用效果。 基于π定理和強(qiáng)度折減法理論，分別計(jì)算邊坡在不同參數(shù)組合下的安全系數(shù)，分析巖土體強(qiáng)度參數(shù)的變化對(duì)邊坡穩(wěn)定性的影響，，并建立安全系數(shù)與各影響因素之間的π參數(shù)形式函數(shù)關(guān)系；結(jié)果表明，巖土體強(qiáng)度參數(shù)中，粘聚力和內(nèi)摩擦角對(duì)邊坡的安全系數(shù)影響比抗拉強(qiáng)度明顯。 以廣州某基坑邊坡工程實(shí)例為研究對(duì)象，建立三維模型，計(jì)算分析邊坡在無水干燥、滲流應(yīng)力不耦合與滲流應(yīng)力耦合三種工況下的穩(wěn)定性情況；得出三種工況下的基坑邊坡安全系數(shù)分別為1.7，1.4和1.1，說明地下水和邊坡應(yīng)力場耦合作用對(duì)邊坡的穩(wěn)定性影響明顯，在分析討論含水邊坡的穩(wěn)定性問題時(shí)，考慮地下水與邊坡的耦合作用十分必要；為類似工程邊坡穩(wěn)定性分析提供借鑒。
[Abstract]:With the increase of national investment in infrastructure construction, a large number of geotechnical engineering problems have emerged. Among them, the stability of slope and foundation pit is more prominent. Especially in coastal areas, engineering rock and soil are affected by groundwater seepage. A large number of slope instability accidents are due to the role of groundwater. It is of great practical significance to study the influence of groundwater seepage on slope stability. The typical profile of the slope is selected, the stability of the slope is analyzed by using the FLAC3D software, the stability of the slope is analyzed by the cloud diagram of stress and displacement, and the variation of the slope stability is calculated and analyzed by changing the groundwater level. The influence mechanism and effect of groundwater on slope are discussed. Based on 蟺 theorem and strength reduction theory, the safety factors of slope under different parameter combinations are calculated, and the influence of rock and soil strength parameters on slope stability is analyzed. The 蟺 -parameter function between the safety factor and the influencing factors is established, and the results show that the cohesive force and the angle of internal friction have more influence on the safety factor of the slope than the tensile strength among the strength parameters of rock and soil. Taking a slope engineering example of foundation pit in Guangzhou as the research object, a three-dimensional model is established to calculate and analyze the stability of the slope under the conditions of anhydrous drying, seepage stress uncoupling and seepage stress coupling. The results show that the slope safety factors of foundation pit under three conditions are 1.71.4 and 1.1 respectively, which indicates that the coupling effect of groundwater and slope stress field has obvious influence on the stability of slope. When analyzing and discussing the stability of water-bearing slope, It is necessary to consider the coupling effect of groundwater and slope and provide reference for slope stability analysis of similar engineering.
【學(xué)位授予單位】：武漢科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU43

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