小江断裂带巧家段巨型古滑坡及其工程地质特征 |
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关键词:Xiaojiang fault Jinsha River gigantic pre-historic landslide earthquake engineering geological characteristics |
基金项目:中国地质调查局地质调查项目(编号: DD20160268);国家自然科学基金项目(编号: 41571013) |
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Engineering Geological Characteristics of Gigantic Pre-historic Landslide along Qiaojia Section of the Xiaojiang Fault |
Qiaojia County is located at the intersection area of Xiaojiang fault, Zemuhe fault and Wulianfeng fault. This area is characterized by complicated geological structures, frequent fault and earthquake activities, and high susceptibility to geological hazards. To the east of the Qiaojia section of Xiaojiang fault, a gigantic pre-historic landslide was identified through remote sensing interpretation and engineering geology analysis. Displaced material of the Qiaojia landslide is 5.5 km long and 9 km wide. Estimation shows that the average depth is 250 m and the volume is 1×109 m3. The Qiaojia landslide has a shape of round-backed armchair. The lateral boundaries are developed along small-scale secondary faults. Terrace of displaced material consists of multiple flat to moderate benches connected with steep slopes. The Qiaojia landslide deposit is mainly composed of Permian limestone of Yangxin Formation and basalt of Emei Formation. The rock mass is heavily broken and cut into angular rocks by many intersecting discontinuity sets. The deposit has been intensively weathered with the preservation of several large-scale longitudinal gullies. It is believed that the Qiaojia landslide probably resulted from differential tectonic lift or strong earthquake due to intensive activity of Xiaojiang fault. Further research should be carried out to assess the risk of landslide reactivity or the possible generation of similar gigantic landslides under the condition of possible strong earthquake along the Qiaojia section of Xiaojiang fault. |
FENG Zhen,WU Zhong-hai,CAO Jia-wen,HU Meng-meng,HA Guang-hao,KANG Huai-xin.2019.Engineering Geological Characteristics of Gigantic Pre-historic Landslide along Qiaojia Section of the Xiaojiang Fault[J].Acta Geoscientica Sinica,40(4):629-636. |
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