發(fā)布時間：2018-01-17 15:03

  本文關(guān)鍵詞：黃土斜坡的坡體結(jié)構(gòu)特征及效應(yīng)研究　出處：《蘭州大學》2015年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 黃土斜坡 坡體結(jié)構(gòu) 巖性 接觸面 臨空面

【摘要】：黃土斜坡是西北地區(qū)典型的地貌景觀之一,在黃土地區(qū)進行西氣東輸工程、高壓輸電線路工程等建設(shè)時,這些重大工程與黃土斜坡相互作用、相互制約,從而誘發(fā)并激增了一系列工程病害與次生災(zāi)害,嚴重制約著城鎮(zhèn)建設(shè)和重大工程建設(shè)。因此,本文以甘肅省內(nèi)的黃土斜坡為調(diào)查對象,結(jié)合野外調(diào)研資料與室內(nèi)文獻,構(gòu)建了黃土斜坡的坡體結(jié)構(gòu)概念,并基于坡體結(jié)構(gòu)對黃土斜坡進行了分類,最后采用數(shù)值計算探討了黃土斜坡的坡體結(jié)構(gòu)效應(yīng)。這將對西部地區(qū)黃土斜坡地質(zhì)災(zāi)害的勘察、設(shè)計、防治、評價等具有重要的理論和現(xiàn)實意義。本文主要研究成果如下。(1)提出了黃土斜坡的坡體結(jié)構(gòu)概念并總結(jié)了黃土斜坡的坡體結(jié)構(gòu)特征。黃土斜坡的坡體結(jié)構(gòu)即黃土斜坡巖土體巖性特征和接觸面特征與斜坡臨空面特征之間的內(nèi)在組合關(guān)系,黃土斜坡的巖性特征是黃土斜坡區(qū)別于其它斜坡類型的本質(zhì)區(qū)別,也是構(gòu)成黃土斜坡的物質(zhì)基礎(chǔ)；接觸面特征是黃土與其下伏巖層的接觸關(guān)系,不同接觸面形態(tài)及其與臨空面的組合關(guān)系對黃土斜坡的演化至關(guān)重要；臨空面特征是黃土斜坡的外在表現(xiàn),是產(chǎn)生各類災(zāi)害的先決條件。(2)基于坡體結(jié)構(gòu)對黃土斜坡進行了類型劃分,并總結(jié)了黃土斜坡典型類型的坡體結(jié)構(gòu)基本特征。綜合黃土斜坡的坡體結(jié)構(gòu)的重要因素,對黃土斜坡進行了不同層次劃分,首先從基巖產(chǎn)狀劃分為3類,其次根據(jù)接觸面形態(tài)和接觸面與臨空面的關(guān)系將黃土斜坡細分為36小類,并且發(fā)現(xiàn)不同基巖產(chǎn)狀的黃土斜坡具有不同的坡體結(jié)構(gòu)基本特征。(3)黃土斜坡的坡體結(jié)構(gòu)對黃土斜坡的演化機制和穩(wěn)定性等方面具有不同的效應(yīng)。黃土斜坡的坡體結(jié)構(gòu)巖性效應(yīng)主要表現(xiàn)在黃土中的層狀結(jié)構(gòu)及巖性組合對黃土斜坡的穩(wěn)定性具有明顯的“雙重效應(yīng)”；接觸面效應(yīng)主要為接觸面形態(tài)及其與臨空面的組合關(guān)系決定黃土斜坡變形破壞的演化過程及破壞模式；臨空面效應(yīng)則主要表現(xiàn)為臨空條件決定了黃土斜坡內(nèi)部的應(yīng)力分布及大小,直接影響黃土斜坡的穩(wěn)定性及其可能的變形破壞方式。
[Abstract]:Loess slope is one of the typical landforms in the northwest of China. In the construction of west to east gas transmission project and high voltage transmission line project in loess area, these important projects interact with loess slope and restrict each other. As a result, a series of engineering diseases and secondary disasters were induced and proliferated, which seriously restricted the construction of towns and major projects. Therefore, this paper takes loess slopes in Gansu Province as the investigation object. Combined with field investigation data and indoor literature, the concept of slope body structure of loess slope is constructed, and the loess slope is classified based on slope body structure. Finally, the slope structure effect of loess slope is discussed by numerical calculation, which will investigate, design and prevent the geological hazard of loess slope in the west of China. Evaluation has important theoretical and practical significance. The main research results of this paper are as follows:. This paper puts forward the concept of slope body structure of loess slope and summarizes the slope body structure characteristics of loess slope. Combinatorial relationship. The lithologic characteristic of loess slope is the essential difference between loess slope and other slope types, and it is also the material foundation of loess slope. The contact surface is characterized by the contact relationship between loess and its underlying strata. Different contact surface morphology and its combination with the face of the face are very important for the evolution of loess slope. The characteristics of face face is the external manifestation of loess slope and the precondition of all kinds of disasters. (2) based on the structure of slope, the loess slope is classified. This paper summarizes the basic characteristics of typical types of slope structure of loess slope, synthesizes the important factors of slope structure of loess slope, and classifies loess slope into three types according to the occurrence of bedrock. Secondly, the loess slope is subdivided into 36 subclasses according to the shape of the contact surface and the relationship between the contact surface and the empty surface. It is also found that loess slopes with different bedrock occurrence have different basic characteristics of slope structure. The slope structure of loess slope has different effects on the evolution mechanism and stability of loess slope. The lithologic effect of slope structure of loess slope is mainly manifested in the stratified structure of loess and the combination of lithology and lithology to loess slope. The stability of the. Dual effects "; The contact surface effect mainly determines the evolution process and failure mode of loess slope deformation and failure. On the other hand, the effect of face to air mainly determines the stress distribution and size of loess slope, and directly affects the stability of loess slope and its possible deformation and failure mode.
【學位授予單位】：蘭州大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P642.22

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本文編號：1436740