S210线芦山-宝兴段崩塌灾害危险性分析及防治对策建议

＂4·20＂芦山地震发生后,作为进出地震灾区的生命线工程省道S210芦山-宝兴段多处发生崩塌滚石等次生地质灾害,堵断交通,威胁来往群众的生命安全,严重影响了抗震救灾和灾后的恢复重建。通过对此路段进行崩塌灾害现场考察,得出此路段的崩塌灾害多发生在大于40°的坡体上,坡向为SW、W和NW,易发岩性为灰岩、砂岩、白云岩和砾岩,切割深度多大于16m。通过GIS进行因子叠加分析,将此路段划分为3级危险度区域,并根据芦山地震灾区崩塌滚石灾害成因机制、分布与活动特征、成灾方式与危害对象,提出了相应的防治对策与建议。

Study on S210 line Lushan-Baoxing segment collapse hazard assessment and control measures

After the 4·20 Lushan Earthquake,many collapses and rock falls happened on the S210 provincial highway,which is an important lifeline to go into the earthquake-stricken area. The highway was blocked and people＇s lives and safety were threatened by the rocks. These secondary geological disasters affected the reconstruction and post-disaster recovery severely. Through the field investigation,it can draw a conclusion that the collapse often develops on the slopes with the gradient more than 40 degree. The aspect of slopes usually is southwest,west,or northwest. Rock types mainly are limestone,sandstone,dolomite,and conglomerate. The cutting depth of topography is more than 16 m. Through GIS overlay analysis,this section was divided into three grades. And according to the collapse formation mechanism,the characteristics of distribution and activities,and harm objects,control measures and proposals were proposed.