Developing law and disaster modes of geohazards in red bed region of southwestern China: A case study of Yiliang County of Yunnan Province
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摘要:
红层区边坡的变形破坏引发的地质灾害类型多、数量大，造成的人员伤亡和财产损失较大。以彝良县红层地区地质灾害为研究对象，结合实地调查，对彝良县红层边坡变形破坏所引发的49处不稳定斜坡、150处滑坡、53处崩塌进行了统计分析，总结了发育规律及特征。对不同斜坡结构下的红层边坡的成灾模式及破坏过程进行了分析，红层顺向边坡常见破坏模式为滑移-拉裂式；横向边坡常见破坏模式为崩解-冲刷式；反向坡、斜向坡的常见破坏模式为软岩崩解剥落-硬岩卸荷拉裂坠落式。研究可为彝良县等红层发育地区的地质灾害防治和管理提供一定的技术支持和参考。
Abstract:The deformation and destruction of slope in red bed area frequently cause many types and large quantities of geological hazards, resulting in large casualties and property losses. Taking the geological hazards in the red bed area of Yiliang county as the research object, the overall developing laws and characteristics of the geohazards were statistically analyzed based on a detailed field survey of 49 unstable slopes, 150 landslides, and 53 rockfalls. Then, the disaster modes and failure process of slopes under different models of slope srtuctures are carried out systematically. The failure mode of consequent slopes are sliding-cracking modes, the failure mode of transverse slopes are disintegrating and scouring mode, the failure mode of reverse and oblique slopes are soft rock disintegration and peeling-hard rock cracking and falling. The research can provide some technical support and reference for the prevention and management of geological disasters in other red bed areas.
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Key words:
- red bed /
- geohazards /
- developing law /
- disaster modes
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