都汶高速G213沿线崩塌堆积特征初步研究

Preliminary Study of the Characteristics of Accumulative Collapses on the Dujiangyan-Wenchuan Section of the G213 Expressway

汶川地震后,成都至汶川的高速G213两岸分布着大量的崩塌灾害,发生多起崩塌淤埋公路的事件,严重威胁G213的安全。为了研究G213汶川段沿线崩塌堆积特征及其规模,通过野外调查和GIS分析,发现汶川震区共计2 067处崩塌灾害点,崩塌堆积体的平均堆积坡度为31.3°。通过单因子统计分析和理论分析,研究得到G213汶川段的沿线崩塌分布特征、堆积特征。结果表明:汶川震区崩塌体的堆积体积与堆积厚度、堆积面积呈指数函数关系;由牛顿定律分析汶川震区的崩塌堆积范围与危岩体分布高差以及危岩体的初始运动方向等因素相关。研究成果对震区G213公路沿线的崩塌堆积储量以及崩塌威胁范围提供参考价值。

After the Wenchuan Earthquake,there are a large number of collapse disasters distributed on both sides of the Chengdu to Wenchuan Section of the G213 Expressway,and series of collapses occur and different sections of expressway are buried,which seriously threaten the traffic safety on G213.In order to study the accumulated scale and characteristics of collapses located on the Wenchuan Section of G213,through field investigations and GIS,it is found out that there are about 2067 collapses points in the study area,and the average accumulated slope of collapses is 31.3°.Based on the single factor statistical analysis and theoretical analysis of collapses in Wenchuan earthquake area,the distribution and accumulation characteristics of collapses located in the G213 Wenchuan section are obtained.The results show out that:the accumulated volume has an exponential function relationship with the accumulated thickness and accumulated area;according to Newton’s laws of motion,the accumulated ranges of collapses are related to the altitude difference and initial motion direction of the dangerous rock.The research results can provide reference for the reserves and the scope of collapse threats study.