【摘要】：陜北黃土高原地區(qū)，黃土分布廣且濕陷性較強(qiáng)，汛期的短歷時(shí)強(qiáng)降雨常常引發(fā)公路邊坡災(zāi)害的發(fā)生，造成巨大的經(jīng)濟(jì)損失并對社會造成不良影響。結(jié)合陜北公路邊坡的實(shí)際狀況，對公路邊坡災(zāi)害進(jìn)行災(zāi)害危險(xiǎn)性分區(qū)研究，深入地了解了陜北黃土地區(qū)邊坡災(zāi)害的地域特征，揭示了災(zāi)害規(guī)律，旨在為陜北的路網(wǎng)規(guī)劃、設(shè)計(jì)、養(yǎng)護(hù)和災(zāi)害防治提供一定的依據(jù)。 在分析總結(jié)國內(nèi)外對災(zāi)害危險(xiǎn)性分區(qū)研究的基礎(chǔ)上，通過實(shí)地調(diào)查，結(jié)合陜北黃土地區(qū)的地質(zhì)環(huán)境概況和外動力環(huán)境概況，依據(jù)區(qū)域公路邊坡災(zāi)害的類型和特點(diǎn)，從巖土體特性、地形地貌因素、誘發(fā)因素和植被因素四方面考慮，依照指標(biāo)選取原則選取分區(qū)指標(biāo)。 指標(biāo)選取過程中充分考慮與陜北公路邊坡實(shí)際情況相結(jié)合，利用陜西省公路日常養(yǎng)護(hù)巡查系統(tǒng)μ，獲取公路危險(xiǎn)邊坡高度和危險(xiǎn)邊坡點(diǎn)密度兩個(gè)指標(biāo)數(shù)據(jù)，另選取巖土體類型、地面坡度、地表切割密度、降雨量≥25mm的日數(shù)和植被覆蓋度共七個(gè)指標(biāo)構(gòu)建區(qū)域公路邊坡災(zāi)害危險(xiǎn)性評價(jià)指標(biāo)體系。依據(jù)基于物元的層次分析法，確定各分區(qū)指標(biāo)的權(quán)重，利用ArcGIS10.0的空間分析功能，生成各指標(biāo)圖層，依照分區(qū)模型疊加得到《陜北公路邊坡災(zāi)害危險(xiǎn)度圖》。 將陜北分為3個(gè)一級危險(xiǎn)區(qū)：輕度、中度、危險(xiǎn)；其中中度危險(xiǎn)區(qū)又細(xì)分為2個(gè)亞區(qū)。依據(jù)陜北公路邊坡災(zāi)害危險(xiǎn)性分區(qū)，結(jié)合陜北干線路網(wǎng)，分段進(jìn)行道路危險(xiǎn)性評價(jià)，并針對性的提出防治措施。
[Abstract]:In the Loess Plateau of northern Shaanxi, loess is widely distributed and collapsible. Short duration heavy rainfall in flood season often leads to highway slope disasters, resulting in huge economic losses and adverse effects on society. Combined with the actual situation of the highway slope in northern Shaanxi, this paper studies the disaster risk zoning of the highway slope disaster, deeply understands the regional characteristics of the slope disaster in the loess area of northern Shaanxi, reveals the disaster law, and aims at planning and designing the road network in northern Shaanxi. Maintenance and disaster prevention and control provide a certain basis. On the basis of analyzing and summarizing the research on disaster risk zoning at home and abroad, through field investigation, combined with the general situation of geological environment and external dynamic environment in loess area of northern Shaanxi, according to the types and characteristics of regional highway slope disasters, According to the principle of index selection, the zoning index is selected from four aspects: rock and soil characteristics, topographic and geomorphological factors, inducing factors and vegetation factors. In the process of index selection, combined with the actual situation of Shaanxi highway slope, the data of highway dangerous slope height and dangerous slope point density are obtained by using Shaanxi highway daily maintenance and inspection system 渭, and the type of rock and soil is selected. There are seven indexes of ground slope, surface cutting density, rainfall 鈮，

本文編號：2496868