岷江断裂中北段新构造活动和次生滑坡灾害的因素分析

Analysis on the Influence of Neotectonics Activity and Secondary Landslide Disaster in the Middle and North Section of Minjiang Fault

岷江断裂中北段主要位于松潘川主寺至镇江关一带,为高山宽谷地貌特征的人口密集区,在晚更新世以来形成了较多的滑坡,分析区域内滑坡发生的因素对该地区的地质灾害防治提供基础性参考,本文中从断裂带线性分布的次生滑坡的规律特征入手开展影响因素分析,揭示岷江断裂中北段新构造活动与次生滑坡的发育相关关系,在岷江断裂中北段(松潘县1:10000城市活动断层探查)调查的基础上,分析了影响岷江断裂中北段沿断裂带的地表破裂特征与滑坡发育特征的关系,野外调查发现岷江断裂中北段断裂与河流水系流向一致(断裂带与河流平行),激发耦合作用,使区域内次生地质灾害集中分布;断裂带明显控制了滑坡的发育特征。

The north central section of Minjiang fault is mainly located in the area from Songpan Chuanzhusi to Zhenjiangguan,which is a densely populated area with high mountains and wide valleys.Since the Late Pleistocene,many landslides have been formed.Analyzing the factors of landslides in the region provides a basic reference for the prevention and control of geological disasters in the region.In this paper,the analysis of in-fluencing factors is carried out from the characteristics of secondary landslides linearly distributed in the fault zone,reveal the correlation between ne-otectonics activity and the development of secondary landslides in the north central section of the Minjiang fault.Based on the investigation of the north central section of the Minjiang fault(1:10000 urban active fault exploration in Songpan County),analyze the relationship between the surface fracture characteristics along the fault zone and the development characteristics of landslides in the north central section of the Minjiang fault.The field sur-vey found that the fault in the north central section of the Minjiang fault is consistent with the flow direction of the river system(the fault zone is par-allel to the river),triggering coupling,concentrate the distribution of secondary geological disasters within the region.The fault zone clearly controls the development characteristics of landslides.