本文關(guān)鍵詞：渭玉高速公路沿線(xiàn)滑坡發(fā)育特征及穩(wěn)定性研究　出處：《西安科技大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 公路滑坡 發(fā)育特征 影響因素 穩(wěn)定性評(píng)價(jià)

【摘要】：隨著“西部大開(kāi)發(fā)”戰(zhàn)略的實(shí)施,西部地區(qū)高速公路里程顯著增長(zhǎng),完善了西部地區(qū)路網(wǎng)結(jié)構(gòu)、加強(qiáng)了區(qū)域經(jīng)濟(jì)聯(lián)系、改善了運(yùn)輸環(huán)境,促進(jìn)了地方經(jīng)濟(jì)發(fā)展和社會(huì)進(jìn)步。但近年來(lái),西部地區(qū)高速公路的負(fù)效應(yīng)也日益突出,滑坡、崩塌等地質(zhì)災(zāi)害對(duì)交通工程建設(shè)、公路安全運(yùn)營(yíng)以及區(qū)域人民財(cái)產(chǎn)安全產(chǎn)生了不同程度的危害,因此對(duì)公路地質(zhì)災(zāi)害的研究具有重要意義。本文以渭玉高速公路沿線(xiàn)25處滑坡為研究對(duì)象,分析其發(fā)育特征、影響因素、形成機(jī)理,評(píng)價(jià)其穩(wěn)定性,具有一定的應(yīng)用價(jià)值,取得了以下結(jié)論:(1)沿線(xiàn)滑坡發(fā)育特征:從滑坡厚度、規(guī)模、形成時(shí)代及物質(zhì)組成分析得出,滑坡以新滑坡為主,中厚層、中型滑坡最為發(fā)育,可分為黃土層內(nèi)型滑坡滑坡和黃土-基巖型滑坡;平面形態(tài)可分為扇形、舌形、疊瓦形以及雙頭M形四種類(lèi)型;黃土層內(nèi)型滑坡,其剖面形態(tài)以凹形為主,而黃土-基巖型滑坡以階梯狀為主;外形特征滑坡寬度長(zhǎng)度之比以1-1.6之間居多;黃土層內(nèi)型滑坡其邊界特征表現(xiàn)為剪出口位置相對(duì)較高,而黃土-基巖型滑坡剪出口位置較低;黃土層內(nèi)型滑坡變形特征呈現(xiàn)出滑帶后部多呈近似直線(xiàn),而黃土-基巖型滑坡滑帶整體多呈圓弧形;黃土層內(nèi)型滑坡運(yùn)動(dòng)特征以?huà)伋鼋怏w型為主,而黃土-基巖型滑坡以錯(cuò)動(dòng)滑出型為主。(2)沿線(xiàn)影響滑坡發(fā)育的主要因素包括大氣降水、坡度、地表水以及地層巖性;次要因素為坡高、工程建設(shè)、地下水、地貌、新構(gòu)造運(yùn)動(dòng)、農(nóng)業(yè)灌溉、構(gòu)造格局、外部荷載以及斷裂;綜合分析了沿線(xiàn)滑坡形成原因,即地層巖性是滑坡形成的重要內(nèi)因和物質(zhì)基礎(chǔ),地形地貌是空間因素,雨水是動(dòng)力因素和誘發(fā)因素;提出了沿線(xiàn)滑坡的蠕變-拉裂運(yùn)動(dòng)機(jī)理,分為蠕動(dòng)變形,蠕動(dòng)擠壓,滑動(dòng)加速,拉裂下滑四個(gè)階段。(3)對(duì)沿線(xiàn)滑坡進(jìn)行了穩(wěn)定性分析與評(píng)價(jià):黃土層內(nèi)型滑坡在天然狀態(tài)下以基本穩(wěn)定狀態(tài)為主,在飽水狀態(tài)下以欠穩(wěn)定狀態(tài)為主;黃土-基巖型滑坡在天然和飽水狀態(tài)下以穩(wěn)定狀態(tài)為主;在地震狀態(tài)下沿線(xiàn)滑坡以不穩(wěn)定狀態(tài)為主;降雨使沿線(xiàn)滑坡的穩(wěn)定系數(shù)平均降低了 8.23%;地震使沿線(xiàn)滑坡的穩(wěn)定系數(shù)平均降低了 21.18%;研究區(qū)按穩(wěn)定性可分為穩(wěn)定-基本穩(wěn)定區(qū)和欠穩(wěn)定區(qū)。
[Abstract]:With the implementation of the strategy of "developing the West", the highway mileage in the western region has increased significantly, the road network structure in the western region has been improved, regional economic ties have been strengthened, and the transportation environment has been improved. Promote the local economic development and social progress, but in recent years, the negative effects of highway in the western region are increasingly prominent, landslide, collapse and other geological disasters on traffic engineering construction. Highway safety operation and regional people's property safety have different degrees of harm, so the study of highway geological hazards is of great significance. This paper takes 25 landslides along Wei-Yu expressway as the research object. Analysis of its development characteristics, influencing factors, formation mechanism, evaluation of its stability, has certain application value, obtained the following conclusions along the landslide development characteristics: from the landslide thickness, scale. The formation time and material composition analysis show that the landslide is mainly new landslide, medium thick layer, medium landslide is the most developed, can be divided into loess inside landslide and loess-bedrock type landslide; The plane shape can be divided into four types: sector shape, tongue shape, imbricate shape and double head M shape. The profile of loess landslide is mainly concave, while that of loess bedrock landslide is ladder. The ratio of the width and length of the landslide is mostly between 1-1.6; The boundary characteristic of loess landslide is that the location of shear exit is relatively high, but the location of loess bedrock landslide is lower. The deformation characteristics of loess landslide show that the back part of the slip zone is almost straight, while the loess-bedrock landslide slide zone is mostly circular arc. The characteristics of landslide movement in loess layer are mainly disintegrating type, while that of loess-bedrock landslide is mainly staggered slip type. The main factors that influence the development of landslide along the loess layer include precipitation and slope. Surface water and stratigraphic lithology; The secondary factors are slope height, engineering construction, groundwater, geomorphology, neotectonic movement, agricultural irrigation, structural pattern, external loads and faults; The formation reason of landslide along the route is analyzed synthetically, that is, stratigraphic lithology is the important internal cause and material foundation of landslide formation, landform is space factor, Rain Water is dynamic factor and inductive factor. The creep-tensile movement mechanism of landslide along the line is put forward, which includes creep deformation, creep extrusion and sliding acceleration. The stability of landslide along the line is analyzed and evaluated in four stages, I. e., the basic stable state in the natural state and the unsteady state in the saturated state. Loess-bedrock landslide is mainly stable in natural and saturated state. Under the earthquake condition, the landslide along the route is mainly unstable. The stability coefficient of landslide along the line was reduced by 8.23 by rainfall. The stability coefficient of landslide along the line was reduced by 21.18% after the earthquake. According to the stability, the study area can be divided into stable-basic stable region and understable region.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：U412.22;P642.22

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