【摘要】：西南地區(qū)地質(zhì)條件復(fù)雜，為水毀形成的重要區(qū)域。本文對西南地區(qū)公路水毀進行野外調(diào)研，根據(jù)西南地區(qū)水毀情況對公路水毀分類，分類包括路基缺口、堆積物掩埋道路、混凝土路面板懸空、路基沉陷、滑坡推擠路基、橋涵結(jié)構(gòu)水毀等6類。將其中一種分類情況—路基缺口作為本文的研究對象，研究路基有護坡無面板，受山洪及泥石流作用下路基缺口的力學(xué)形成機制。分析其機制能掌握野外路基缺口的形成模式，掌握路基缺口的形成部位，發(fā)展過程，雨期缺口的形成時間，對安全避災(zāi)等能起到指導(dǎo)作用，并能針對路基缺口形成部位采取邊坡防護、改善路基材料提高路基強度等措施增加路基缺口的形成周期。 本文的主要工作： （1）對西南地區(qū)20余條國省道公路水毀情況進行了現(xiàn)場調(diào)研，主要進行省道公路水毀現(xiàn)場調(diào)查與資料收集，，對西南地區(qū)公路水毀情況進行了分析，以此對水毀作了科學(xué)的分類。 （2）根據(jù)現(xiàn)場收集的沿線地形地貌、水文地質(zhì)、巖性、地質(zhì)構(gòu)造、公路建筑特征等資料，分析了路基缺口形成的條件。 （3）針對西南地區(qū)出現(xiàn)的路基缺口情況，分析了路基缺口的形成特點、力學(xué)破壞模式，并針對不同破壞模式分析了其形成過程以及形成機理。 （4）基于流體力學(xué)方法，確定了彎道環(huán)流作用下的掏蝕槽球心深度位置，以及水平環(huán)流作用下的掏蝕槽底面圓心的平面位置，根據(jù)運動學(xué)以及Osman公式得到了掏蝕槽半徑隨時間變化的理論公式。 （5）基于彈塑性力學(xué)方法，分析了路基缺口的三維力學(xué)模型—滑動失穩(wěn)型缺口的啟動機制，根據(jù)極限平衡理論，求解了此類缺口的臨界掏蝕槽半徑公式，分析了以掏蝕槽半徑為判定條件的缺口形成機制。 （6）基于彈塑性力學(xué)方法，分析了路基缺口的三維力學(xué)模型—墜落失穩(wěn)型缺口的起動機制，根據(jù)極限平衡理論，求解了此類缺口的臨界掏蝕槽半徑公式，分析了以掏蝕槽半徑為判定條件的缺口形成機制。 （7）基于塑性力學(xué)方法，分析了路基缺口的三維力學(xué)模型—泥石流沖擊型缺口的啟動機制，分析了泥石流漿體沖擊力大小與缺口形態(tài)的關(guān)系，并建立了泥石流沖擊力與路基頂面沖擊方向上缺口長度之間的關(guān)系式；根據(jù)塑性力學(xué)和hertz碰撞理論求解了泥石流中大塊石的沖擊力與沖擊坑半徑的關(guān)系式。
[Abstract]:The geological conditions in southwest China are complex, which is an important area in the formation of water damage. This paper makes a field investigation on highway water damage in southwest China, classifies it according to the water damage situation in southwest China, including roadbed gap, accumulation buried road, concrete pavement slab hanging, roadbed subsidence and landslide pushing roadbed. There are 6 kinds of bridge and culvert structures, such as water damage and so on. Taking the roadbed gap as the research object, this paper studies the mechanics formation mechanism of roadbed notches under the action of mountain flood and debris flow. The analysis of its mechanism can master the formation mode of roadbed gap in the field, the forming position of roadbed gap, the development process, and the forming time of the gap in rainy period, which can play a guiding role in safe avoiding disaster and so on. It can increase the period of roadbed notch formation by taking measures such as slope protection, improving roadbed material and improving subgrade strength, aiming at the formation position of roadbed notch. The main work of this paper is as follows: (1) the situation of water damage of more than 20 national provincial highways in southwest China is investigated on the spot, mainly on the spot investigation and data collection of provincial highway water damage, and the situation of highway water damage in southwest China is analyzed. A scientific classification of water destruction was made. (2) according to the data of landform, hydrogeology, lithology, geological structure and highway construction, the conditions of the formation of roadbed gap are analyzed. (3) in view of the roadbed gap in southwest China, the formation characteristics and mechanical failure mode of roadbed gap are analyzed, and the formation process and formation mechanism of roadbed notch are analyzed according to different failure modes. (4) based on the hydrodynamics method, the depth position of the spherical center of the grooves under the action of the curved circulation and the plane position of the center of the bottom surface of the grooves under the action of the horizontal circulation are determined. According to the kinematics and the Osman formula, the theoretical formula of the time-dependent variation of the grooving radius is obtained. (5) based on the elasto-plastic mechanics method, the starting mechanism of sliding unstable notch, a three-dimensional mechanical model of roadbed notch, is analyzed. According to the limit equilibrium theory, the critical notch radius formula of this kind of notch is solved. The mechanism of notch formation based on the cutting groove radius is analyzed. (6) based on elasto-plastic mechanics method, the three-dimensional mechanical model of roadbed notch, the starting mechanism of falling unstable notch, is analyzed. According to the limit equilibrium theory, the critical notch radius formula of this kind of notch is solved. The mechanism of notch formation based on the cutting groove radius is analyzed. (7) based on the plastic mechanics method, the three-dimensional mechanical model of roadbed notch-the initiation mechanism of debris flow impact notch is analyzed, and the relationship between the impact force of debris flow slurry and the notch shape is analyzed. The relationship between the impact force of debris flow and the notch length in the direction of impact on the top of roadbed is established. According to plasticity mechanics and hertz collision theory, the relation between the impact force and the radius of impact pit in debris flow is solved.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U416.1

【參考文獻】

相關(guān)期刊論文 前10條

1 白子培,陳洪凱,張智洪;四川省公路水毀環(huán)境區(qū)劃初探[J];重慶交通學(xué)院學(xué)報;1993年01期

2 肖盛燮,陳洪凱,吳國松,楊斌;橋梁受洪災(zāi)異相耦合破壞作用的形態(tài)及仿真雛議[J];重慶交通學(xué)院學(xué)報;1999年04期

3 祝曉寅,陳洪凱,翁其能,周富春;山區(qū)公路水毀機理與抗毀結(jié)構(gòu)分析——以涼山地區(qū)為例[J];重慶交通學(xué)院學(xué)報;2001年02期

4 鐘盈;陳洪凱;;泥石流淤埋橋梁后的毀損機制分析[J];重慶交通大學(xué)學(xué)報(自然科學(xué)版);2010年05期

5 王平義;彎曲河道凹岸沖刷的環(huán)流分析[J];重慶交通學(xué)院學(xué)報;1994年03期

6 陳洪凱，唐虹梅，吳承平，白子培，胡德源;四川省公路水毀與地質(zhì)環(huán)境的關(guān)系探討[J];重慶交通學(xué)院學(xué)報;1994年04期

7 陳洪凱,祝江林,張永興;公路水毀的系統(tǒng)工程方法論探討[J];重慶交通學(xué)院學(xué)報;1997年02期

8 周長艷;岑思弦;李躍清;彭國照;楊淑群;彭駿;;四川省近50年降水的變化特征及影響[J];地理學(xué)報;2011年05期

9 王寶亮;彭盛恩;陳洪凱;;推移式滑坡形成機制的力學(xué)演繹[J];地質(zhì)災(zāi)害與環(huán)境保護;2010年02期

10 王強;何思明;張俊云;;泥石流防撞墩沖擊力理論計算方法[J];防災(zāi)減災(zāi)工程學(xué)報;2009年04期

本文編號：2459030