芦山灾区流水沟滑坡基本特征及成因机制研究

Study on the Basic Characteristics and Formation Mechanism of Lushan Liushuigou Landslide

芦山7.0级地震相对于汶川地震而言,其释放能量相差甚远,其破坏规模和范围也相对较小。震中芦山地震烈度Ⅸ度,房屋开裂受损严重,未出现大规模的山体垮塌、破裂现象。地质灾害以崩塌落石为主,其次为浅表层滑坡和"山扒皮"现象。流水沟滑坡是本次地震诱发的最为典型的滑坡,纵向坡长约200 m,宽80 m,总方量约20×104m3。在详细调查的基础上,对滑坡的形态特征进行了详细的阐述。着重于地震动力效应,结合地形地貌、岩体结构等因素,对滑坡的形成过程、成因机制进行了研究。并对堆积体的次生灾害进行了分析,从而更好的指导抗震救灾。

Compare with Wenchuan earthquake,Lushan MS= 7. 0 earthquake is a far cry from the release of energy,and its destruction is relatively small in size and scope. Lushan is the epicenter of the earthquake,and the seismic intensity is Ⅸ. Houses severely damaged,and there did not appear massive mountain collapsed,cracking phenomenon. Rockfall is the major geological disasters,followed by shallow landslides and ＂Mountain Flayer＂. The landslide is the most typical earthquake-induced landslides,width80 m,vertical slope about 200 m,a total of about 20 × 10^4m^3. The study is based on detailed investigation of the morphological characteristics of landslide. Focuses on the dynamic effects of the earthquake,combined with topography,rock structure and other factors,to analysis the formation process of the landslide and genetic mechanism. Lastly,predicting the secondary disasters of accumulation,so it is better to direct the relief.