摘要
为了实现公路边坡灾害的易损性评价,以云南省文山至天保二级公路(以下简称"文天线")为例,从公路所承担的功能角度出发,选择经济密度、道路修复时间、公路绕行能力3个因素建立公路边坡灾害易损性评价的指标体系;然后在ArcGIS中实现各指标的定量化,通过指标叠加计算对公路边坡灾害的易损性进行评价;最后,根据评价结果对不同路段的易损性等级进行划分和讨论,同时提出降低边坡灾害易损性的方法。结果表明:文天线各路段易损性为0.07～1.00,全长有30.75%属于极高或高易损性等级;全长有3.96%的路段为极高易损性,这主要因为其绕行的公路长度与绕过的文天线公路长度的比值很大,如要降低这一路段边坡灾害的易损性,可以考虑在今后路网的建设中减少这一路段的绕行公路长度;虽然距离文天线起点最近的路段经济密度最大,但由于其修复时间最短,而且路网密集,绕行的公路长度较小,因此其易损性为中等。
In order to evaluate the vulnerability of highway slope hazard, the second-class highway from Wenshan to Tianbao in Yunnan province （Wentian highway） was taken as an example; three factors including economic density, road repair time and road bypass capacity were used to establish the index system of vulnerability assessment of highway slope hazard considering the function of highway; according to the quantification and superposition calculation of indexes in ArcGIS platform, the vulnerability assessment of highway slope hazard was carried out; the vulnerabilities of different sections were classified and discussed according to the evaluation result, and the methods to reduce the vulnerability of slope hazard were proposed. The results show that the vulnerabilities of different sections in Wentian highway are 0.07-1.00, and 30. 75~ of Wentian highway is high or extremely high; the vulnerability for 3. 96 ~ of Wentian highway is extremely high, and the ratio of length of bypass highway to length of corresponding Wentian highway is large, so that the length of bypass highway can be deceased in future highway construction in order to decease the vulnerability of highway slope hazard; although the economic density of the section near the starting point of Wentian highway is maximum,vulnerability of this section is moderate because of the shortest road repair time, dense road network and shorter length of bypass highway.
出处
《地球科学与环境学报》
CAS
2013年第3期119-126,共8页
Journal of Earth Sciences and Environment
基金
国家自然科学基金重点项目(50639070)
云南省交通运输厅科技教育专项资金项目(2010(A)08-b)
关键词
边坡
易损性评价
公路功能
通行能力
绕行能力
道路修复时间
经济密度
slope
vulnerability assessment
function of highway
traffic capacity
bypass capacity
roadrepair time
economic density
