本文選題：泥石流　切入點：斜坡物源　出處：《西南交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：泥石流是山區(qū)多發(fā)且危害巨大的一類地質(zhì)災(zāi)害,而物源條件是泥石流發(fā)生的基本條件,并且決定著泥石流的規(guī)模大小,對泥石流的治理工程設(shè)計也起到?jīng)Q定性的作用。其中,斜坡物源占據(jù)著泥石流物源的半壁江山,其形成和啟動模式復(fù)雜,動儲量計算困難。本文結(jié)合汶川縣七盤溝泥石流研究了斜坡物源的類型、啟動模式,并且在其基礎(chǔ)上提出了動儲量定量計算的方法,并給出了動儲量的影響因素權(quán)重,主要研究內(nèi)容和成果如下：(1)通過對七盤溝泥石流松散固體物源點的調(diào)查分析,將斜坡物源劃分為崩塌堆積物源、滑坡堆積物源、坡面侵蝕物源和坡頂震裂物源四種類型,并分別分析了每類斜坡物源的特征。(2)在斜坡物源分類的基礎(chǔ)上,對各類物源的啟動模式進行了詳細的分析,對于崩、滑堆積物源根據(jù)其所處位置不同劃分為三類分別進行啟動模式分析。(3)分析了泥石流的沖刷機制,并且推導(dǎo)出了泥石流的最大沖刷深度計算公式,在此基礎(chǔ)上給出了崩、滑堆積物源動儲量計算的兩種方法：弧形滑面搜索法和邊坡穩(wěn)定角法。其中邊坡穩(wěn)定角法分別采用庫倫理論和極限平衡理論推導(dǎo)出了破裂角的表達式。(4)對于坡面物源動儲量的計算引用了RUSLE方程,給出了方程中包含的五個因子(降雨與徑流侵蝕因子、土壤可侵蝕因子、坡長和坡度因子、植被覆蓋因子、侵蝕控制因子)的計算方法,并給出了七盤溝坡面物源點P5根據(jù)此方法計算的實例。(5)利用幾何分析的方法給出了坡頂震裂物源動儲量的計算方法,并采用數(shù)值分析的方法利用FLAC3D軟件對該種計算方法進行了驗證。(6)采用層次分析法分析了影響斜坡物源動儲量的11個因素,并依照各個因素的權(quán)重值將其劃分為影響很大(10%),影響較大(5%),影響一般(5%)三個等級。
[Abstract]:Debris flow (debris flow) is a kind of geological hazard in mountainous area, and the source condition is the basic condition of debris flow, and it determines the scale of debris flow, and plays a decisive role in the design of debris flow control engineering. The slope source occupies half of the debris flow source, its formation and start-up model is complex, and the calculation of dynamic reserves is difficult. This paper studies the types of slope provenance and the starting mode of the debris flow in Qipangou, Wenchuan County, China. On the basis of it, the quantitative calculation method of dynamic reserves is put forward, and the weight of influencing factors of dynamic reserves is given. The main research contents and results are as follows: 1) through the investigation and analysis of the loose solid source points of debris flow in Qipangou, The slope provenance is divided into four types: collapse and accumulation source, landslide accumulation source, slope surface erosion source and slope top shock crack source, and the characteristics of each kind of slope material source are analyzed respectively based on the classification of slope provenance. The starting mode of all kinds of material sources is analyzed in detail. For avalanche and landslide, the debris flow scouring mechanism is analyzed according to the location of the debris flow, which is divided into three types respectively. The formula for calculating the maximum erosion depth of debris flow is derived, and on this basis, the collapse is given. There are two methods to calculate the source dynamic reserves of sliding deposits: the arc sliding surface search method and the slope stability angle method, in which the slope stability angle method is derived by the Coulomb theory and the limit equilibrium theory, respectively, and the expression of the fracture angle is derived from the Coulomb theory and the limit equilibrium theory. The calculation of the material source dynamic reserves is based on the RUSLE equation. The calculation method of five factors (rainfall and runoff erosion factor, soil erosion factor, slope length and slope factor, vegetation cover factor, erosion control factor) included in the equation is given. An example of the calculation of source point P5 on the slope surface of Qipangou according to this method is given. The method of calculating the dynamic reserves of the crack source on the top of the slope is given by using the method of geometric analysis. The numerical analysis method is used to verify the calculation method with FLAC3D software. The analytic hierarchy process (AHP) is used to analyze the 11 factors that affect the dynamic reserves of the slope source. According to the weight value of each factor, it is divided into three grades: the influence is very big, the influence is great, the influence is greater, and the influence is general.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P642.23

【引證文獻】

相關(guān)會議論文 前1條

1 徐友寧;楊敏;張江華;陳華清;裴來政;;影響小秦嶺金礦區(qū)礦山泥石流形成的物源特征分析[A];第八屆海峽兩岸山地災(zāi)害與環(huán)境保育學(xué)術(shù)研討會論文集[C];2011年

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本文編號：1601129