路线走廊震害与环境基础因子关系研究
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摘要
研究地震造成的路线走廊带灾害与环境因子的关系,减少滑坡、泥石流、崩塌等灾害的发生,降低地质灾害对道路的破坏。通过对5.12汶川地震重灾区内G 213、G 317道路路段的资料收集、实地调查,结合理论分析,以ArcGIS软件为基础平台,分析了断裂带距离、地质岩层、地表粗糙度、坡度、坡向、植被类型、道路影响区共7个因子与地质灾害产生的关系。结果表明:距断裂带越远,受到影响越小;地质岩层越古老,越易发生灾害,岩质坡体灾害少于土质坡体;地表粗糙程度为1.2～2时,灾害的密度比较大;坡度为30°～60°时,灾害密度最大;阴坡灾害多于阳坡;阔叶林地带灾害密度分布最大;道路左右0.5km区域灾害密度最大。
The relationship between the route corridor earthquake-induced hazards and basic environmental factors was studied.The connection of seven basic environmental including factors fault zone distance,geological strata,surface slope,aspect,surface roughness,vegetation type and road engineering influence with geological hazards were analyzed based on the ArcGIS platform,through the way of combining data collection from sections of national roads G 213 and G 317 in the hardest-hit regions of 5·12 Wenchuan Earthquake,field investigation and theory analysis.The results show that with the distance being farer,disasters are getting less.The older the geological strata is,the more likely disasters are,and disasters happened less in rocky surface than soil surface.With the index of 1.2~2,more disasters occurred;the surfaces of 30°to 60° slope have the majorities geological hazard;shady slopes have a high distribution density of disasters than sunny slope.Broad-leaved forest is the kind of vegetation type which holds the largest density of disasters.In the range of 0.5 km away from road route,the region has the vast majority of geological disaster.
The relationship between the route corridor earthquake-induced hazards and basic environmental factors was studied.The connection of seven basic environmental including factors fault zone distance,geological strata,surface slope,aspect,surface roughness,vegetation type and road engineering influence with geological hazards were analyzed based on the ArcGIS platform,through the way of combining data collection from sections of national roads G 213 and G 317 in the hardest-hit regions of 5·12 Wenchuan Earthquake,field investigation and theory analysis.The results show that with the distance being farer,disasters are getting less.The older the geological strata is,the more likely disasters are,and disasters happened less in rocky surface than soil surface.With the index of 1.2~2,more disasters occurred;the surfaces of 30°to 60° slope have the majorities geological hazard;shady slopes have a high distribution density of disasters than sunny slope.Broad-leaved forest is the kind of vegetation type which holds the largest density of disasters.In the range of 0.5 km away from road route,the region has the vast majority of geological disaster.
引文
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[4]Bijan Khazai.GIS Approach to Seismic Slope Stability[D].Berkeley:University of California,2004.
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