芦山地震诱发次生地质灾害的分布规律和类型、特征及演化趋势分析

420芦山地震不仅造成了巨大的人员伤亡和财产损失，还诱发了大量的崩塌、滑坡等次生地质灾害。本文在对芦山地震重灾区自然地质环境条件分析的基础上，对芦山地震诱发次生地质灾害的分布发育规律、类型和特征及震后演化趋势等进行了详细的分析和总结。芦山地震新诱发次生地质灾害1337处，主要次生灾害类型为崩塌、滑坡和不稳定斜坡，灾害规模以中小型为主，新增的次生地质灾害主要发育于白垩系、三叠系砂泥岩、二叠系碳酸盐岩地层、第三系砾岩半成岩地层的陡坡和陡崖上以及全强风化壳和第四系堆积物中，并沿龙门山南段断裂带（中林双石断裂）以及宝兴河、芦山河、灵关河等河谷和沟道两侧以及公路内侧山坡的陡坡地段集中分布。芦山地震不仅诱发了数以千计的次生地质灾害，还形成了许多潜在的、隐蔽性强的地质灾害，地震灾区的次生地质灾害总体会呈现加剧发展的趋势。

ANALYSIS ON DISTRIBUTION LAW,TYPES AND CHARACTERISTICS AND DEVELOPMENT TENDENCY OF SECONDARY GEO-HAZARDS INDUCED BY LUSHAN EARTHQUAKE

Lushan earthquake not only caused heavy property loss and personal injuries, but also induced many geological hazards such as avalanches and landslides. This paper is based on the analysis of geological environment condition of the earthquake-stricken area. It deeply analyzes the distribution law, types and characteristics and development tendency of the geological hazards. The earthquake induced 1337geological hazards which mainly include moderate - small scale avalanches, landslides and unstable slopes. The hazards are mainly developed in sandstone and mudstone of the Cretaceous and Triassic system, carbonatite of the Permian system, conglomerate of the Tertiary system and weathered crust and debris of the Quaternary system. They are densely distributed on steep slopes of both sides of the Longmen southern fault (Zhonglin-Shuangshi fault) and Baoxing, Linguan and Lushan river and on the inside slopes of some roads. The earthquake not only induced many geo-hazards, but also caused many potential and hidden geo-hazards. So, the geo-hazards in the disaster area will appear with an increasing trend in the future. This study can provide a reference for disaster prevention and mitigation in the post-earthquake reconstruction.