南漳保康两县碳酸盐岩崩塌发育特征及影响程度分区

近年来,南漳保康两县碳酸盐岩分布区崩塌频发,造成严重人员伤亡与经济损失。基于两县1∶5万地灾详查的32处碳酸盐岩崩塌资料,从时空分布、规模特征、发育层位、构造部位及破坏模式等角度分析了崩塌发育特征,据此将其概括为5种类型。然后,以相关影响程度分区理论为指导,采用软件将两县碳酸盐岩分布区按崩塌影响程度分为直接影响区与非直接影响区,并针对各分区特征提出了相应的崩塌防治建议。最后,选取保康县汤池峡崩塌为典型实例,基于崩塌发育特征提出了针对性较强的防治措施。该成果可系统深入地揭示同类型崩塌或隐患点的发育特征并指导其早期识别与防范工作,对提高崩塌防灾减灾工作认识具有现实意义。

Development characteristics and influence degree zoning of carbonate rock collapse in Nanzhang and Baokang Counties

In recent years, the carbonate rock distribution areas in Nanzhang and Baokang Counties, Hubei Province have collapsed frequently, causing serious casualties and economic losses. Based on the data of 32 carbonate rock collapse obtained from the detailed investigations of 1:50, 000 geological disasters in two counties, this paper summarizes the development characteristics of the collapses from the perspectives of time and space distribution, scale characteristics, development stratigraphy and failure mode. According to the statistical result, the paper summarizes the collapses into five types. Then, using partitioning software and guided by the theory of the impact degree partition, the paper divides the carbonate rock distribution areas into directly affected areas and non-directly affected areas according to the scope of impact and the degree of damage. Subsequently, corresponding collapse prevention measures are proposed for different affected areas. Finally, the Tangchi gorge collapse in Baokang County is selected as a typical example for the analysis of the development characteristics of collapse, a more targeted prevention measures are proposed. The research result in this paper can systematically reveal the development characteristics of the same type of collapse or potential collapse points, and then guide their early identification and prevention. Thus, this has practical significance for raising awareness of disaster reduction and prevention.