本文選題：滲流 + 二維　； 參考：《成都理工大學》2017年碩士論文

【摘要】：在地震動作用過后的土質(zhì)邊坡失穩(wěn)的案列之中發(fā)現(xiàn)了很多由于降雨導致的坡體失穩(wěn)現(xiàn)象。很多學者對此類型的邊坡失穩(wěn)現(xiàn)象做出了大量的研究發(fā)現(xiàn)導致坡體失穩(wěn)的主要原因是由于地震動作用后破體內(nèi)部存在有大量的裂隙,這些裂隙的存在成為了水分運移的通道,從而使得土體力學性質(zhì)迅速降低,最終導致坡體失穩(wěn)。前人對于一維飽和-非飽和滲流解析解的研究已經(jīng)比較成熟,但由于在求解二維飽和-非飽和滲流公式解析解時,邊界條件過于的復雜,不便于求解,所以現(xiàn)階段對二維的飽和-非飽和滲流的研究基本上是依賴于物理實驗以及數(shù)值模擬來進行研究。本文在前人一維飽和-非飽和滲流公式解析解的研究基礎上,將一維的飽和-非飽和滲流公式解析解拓展到二維的飽和-非飽和含裂隙均質(zhì)土滲流的解析解,為研究二維飽和-非飽和滲流提供一種新的理論方法。再通過對不同情況下含裂隙土和含裂隙土質(zhì)邊坡飽和-非飽和滲流公式進行解析求解,通過解析求解得出的孔隙水壓力變化曲線,探討不同裂隙模式情況下對含裂隙土體及土質(zhì)邊坡滲流的影響規(guī)律。本文的主要研究內(nèi)容集中在以下兩個方面:(1)對一維飽和-非飽和滲流公式解析解做了進一步拓展,建立了二維飽和-非飽和含裂隙土滲流解析模型,并推導出了二維滲流控制方程的顯式解析解;(2)本文通過二維滲流解析模型,詳細討論了降雨條件下,不同裂隙模式(裂隙深度、裂隙發(fā)育位置及裂隙密集程度)對土體及坡體滲流的影響規(guī)律。研究發(fā)現(xiàn)裂隙深度的變化對土體及坡體降雨入滲的影響極其巨大,隨著裂隙深度增加降雨的入滲深度幾乎成倍數(shù)的增加。而坡體裂隙降雨入滲情況不同于土體,在降雨入滲的初期由于坡體部位的土體相對于坡頂部位的較薄,所以水分是最先向斜坡部位開始移動,從而導致在在降雨初期坡頂部位孔隙水壓力還存在相對減小的現(xiàn)象。土體及坡體裂隙的發(fā)育寬度和發(fā)育數(shù)量變化對降雨入滲深度影響相對比較輕微,幾乎不發(fā)生變化。
[Abstract]:A lot of slope instability phenomena caused by rainfall have been found in the sequence of soil slope instability after ground motion. Many scholars have done a lot of research on this kind of slope instability phenomenon and found that the main cause of slope instability is that there are a large number of cracks in the broken body after ground motion, and the existence of these cracks has become the channel of water migration. Therefore, the mechanical properties of soil are reduced rapidly and the slope is unstable. The previous researches on the analytical solution of one-dimensional saturated-unsaturated seepage flow have been mature, but the boundary conditions are too complicated to be solved because of the complexity of solving the analytical solution of two-dimensional saturation-unsaturated seepage equation. So the study of two-dimensional saturated-unsaturated seepage basically depends on physical experiments and numerical simulation. In this paper, based on the study of the analytical solution of the one-dimensional saturated-unsaturated seepage flow formula, the analytical solution of the one-dimensional saturation-unsaturated seepage equation is extended to the two-dimensional analytical solution of the saturated unsaturated fractured homogeneous soil seepage. It provides a new theoretical method for the study of two dimensional saturated-unsaturated seepage. Then the saturated unsaturated seepage formula of fractured soil and fractured soil slope is solved analytically, and the pore water pressure variation curve is obtained by analytic solution. The influence of different fracture modes on seepage of fractured soil and soil slope is discussed. The main research contents of this paper are as follows: 1) the analytical solution of one-dimensional saturated-unsaturated seepage equation is further expanded, and a two-dimensional saturated unsaturated fractured soil seepage analytical model is established. The explicit analytical solution of the governing equation of two-dimensional seepage flow is derived in this paper. Through the analytical model of two-dimensional seepage flow, the different fracture modes (depth of fracture) under rainfall condition are discussed in detail. The influence of fracture development position and fracture density on seepage of soil and slope. It is found that the variation of fracture depth has great influence on the rainfall infiltration of soil and slope, and the infiltration depth of rainfall increases almost multiple with the increase of fracture depth. In the early stage of rainfall infiltration, because the soil of slope body is thinner than that of the top of slope, the water is moved to the slope first. As a result, the pore water pressure at the top of the slope decreases relatively at the early stage of rainfall. The variation of the width and quantity of cracks in soil and slope body has little effect on the depth of rainfall infiltration.
【學位授予單位】：成都理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU43

【參考文獻】

相關期刊論文 前10條

1 韓同春;張杰;馬世國;豆紅強;;不同傾角條件下非飽和土質(zhì)邊坡的雨水累積入滲量及穩(wěn)定性敏感性分析[J];中南大學學報(自然科學版);2014年05期

2 簡文星;許強;童龍云;;三峽庫區(qū)黃土坡滑坡降雨入滲模型研究[J];巖土力學;2013年12期

3 李寧;許建聰;欽亞洲;;降雨誘發(fā)淺層滑坡穩(wěn)定性的計算模型研究[J];巖土力學;2012年05期

4 熊祥斌;張楚漢;王恩志;;巖石單裂隙穩(wěn)態(tài)滲流研究進展[J];巖石力學與工程學報;2009年09期

5 吳禮舟;張利民;黃潤秋;許強;;非飽和土的變形與滲流耦合的一維解析分析及參數(shù)研究[J];巖土工程學報;2009年09期

6 張彥洪;柴軍瑞;;裂隙巖體飽和-非飽和滲流研究進展[J];工程勘察;2009年09期

7 吳建偉;王太國;張擴成;;關于巖體滲流力學[J];科技信息(科學教研);2008年15期

8 張建豐;王文焰;賈中華;;具有砂質(zhì)夾層的土壤連續(xù)函數(shù)入滲模型[J];水土保持學報;2007年04期

9 胡立雄;白會人;;降雨入滲的邊坡穩(wěn)定評價方法[J];遼寧工程技術大學學報;2007年02期

10 姜帆;宓永寧;張茹;;土石壩滲流研究發(fā)展綜述[J];水利與建筑工程學報;2006年04期

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