本文選題：延安地區(qū) + 黃土-基巖接觸面滑坡�。� 參考：《長安大學》2017年碩士論文

【摘要】：延安地區(qū)地質(zhì)環(huán)境脆弱,地質(zhì)災害頻發(fā)。尤其是黃土滑坡分布很廣,對當?shù)亟?jīng)濟發(fā)展和人民生命財產(chǎn)威脅很大。延安市老滑坡復活中,以黃土-基巖接觸面滑坡最為常見。這類滑坡的黃土基巖接觸面傾角緩,一般小于10°,小于或近等于綜合內(nèi)摩擦角,理論上不應該發(fā)生滑動,但是卻存在很多實例,例如二莊科滑坡、丁家溝滑坡、小砭溝滑坡、王家溝滑坡等。為了對該類滑坡有較全面的認識,本文以小砭溝滑坡為研究對象,對影響該類滑坡穩(wěn)定性因素進行敏感性分析,并進行模型試驗,探索其滑動原因及演化過程。取得以下成果:(1)通過均勻設(shè)計理論,在不考慮參數(shù)相關(guān)性的影響下,對影響黃土基巖接觸面滑坡穩(wěn)定性因素進行敏感性分析,采用逐步回歸法進行回歸分析,并用實例進行驗證,最終得出內(nèi)摩擦角、坡比、坡高為最敏感性因素。(2)利用量綱分析法對模型試驗的相似準則進行了推導,以此為基礎(chǔ)制作了降雨條件下的延安地區(qū)黃土-基巖接觸面滑坡模型試驗系統(tǒng),獲取了孔隙水壓力、垂直方向土壓力、水平方向土壓力、位移等相關(guān)物理量間的關(guān)系。(3)通過模型試驗得出降雨條件下的該類滑坡地質(zhì)力學模式為蠕滑-拉裂,滑動過程如下:表層蠕滑→坡腳垮塌→后緣拉裂、中前部產(chǎn)生拉張裂縫→坡面泥流→整體滑移、裂縫擴展→前部受擠壓隆起、坡體重心降低。
[Abstract]:The geological environment in Yan'an area is fragile and geological disasters occur frequently.Especially the loess landslide is widely distributed and threatens the development of local economy and people's life and property.The loess-bedrock interface landslide is the most common in the revival of the old landslide in Yan'an.The slope of the loess bedrock contact surface of this kind of landslide is gentle, generally less than 10 擄, less than or nearly equal to the comprehensive angle of internal friction. Theoretically, it should not slip, but there are many examples, such as Erzhuangke landslide, Dingjiagou landslide, Xiaobian gully landslide, etc.Wang Jiagou landslide.In order to have a comprehensive understanding of this kind of landslide, this paper takes Xiaobian Gou landslide as the research object, carries on the sensitivity analysis to the influence landslide stability factor, and carries on the model test, explores its sliding reason and the evolution process.The following results are obtained: 1) based on the uniform design theory and without considering the influence of parameter correlation, the factors affecting the stability of loess bedrock interface landslide are analyzed, and the stepwise regression method is used to carry out regression analysis.Finally, the internal friction angle, slope ratio and slope height are the most sensitive factors.Based on this, a model test system of loess-bedrock interface landslide in Yan'an area under rainfall condition is made, and pore water pressure, vertical earth pressure and horizontal earth pressure are obtained.The relationship between displacement and other related physical quantities. (3) through model test, it is concluded that the geomechanical model of this kind of landslide under rainfall condition is creep slide-tension crack, and the sliding process is as follows: the surface creeping slope foot collapses and the back edge of the slope collapses,In the middle and front part, the slippage of the mudflow on the slope is produced, the front part of the extension of the crack is extruded and the body weight of the slope is reduced.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P642.22

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