鄂西清江岩溶与地质灾害的关系
The relationship between karst formation and geological disasters in Qingjiang river basin, western Hubei Province
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摘要: 鄂西清江流域碳酸盐岩分布广泛，岩溶地质灾害较为发育。文章在清江流域11个县市地质灾害详细调查成果基础上，运用统计归纳和工程地质类比等方法，分析清江岩溶与地质灾害的关系表现在4个方面：岩溶水系统导致岩溶塌陷（及灾害链）；溶蚀扩张和岩溶化诱发加剧滑坡和崩塌，溶蚀风化形成危岩（潜在不稳定斜坡）；钙质胶结的存在加强了滑坡崩塌的稳定性；岩溶与地质灾害易混淆，以新塘石林为例强调二者之间需甄别。指出碳酸盐岩区地质灾害调查应加强岩溶孕灾地质背景研究；研究钙质胶结的分布规律与加固效果可应用于滑坡和崩塌防治。Abstract: Carbonate rocks are widely distributed in the Qingjiang river basin in western Hubei Province. Karst geological disasters often take place in this area. Based on a survey of geological disaster in 11 counties, the relationship between karst formation and geological disasters is analyzed and evaluated using statistical and analogical methods. The relationship is summarized in four main points, (1) Karst cave systems may cause karst collapse and disaster chains. (2) Landslides or avalanches are induced by karstification and enhanced by fractures expansion under the karst dissolution process. Dangerous rocks or potentially unstable slopes are generally linked with karst dissolution and weathering. (3) It is indicated that calcareous cementation among rocks can enhance the stability of landslides and avalanches. (4) For the case study in Xintang stone forest, karst phenomena and landslides were identified. It is proposed that it is necessary to investigate the karst background of disaster areas, and evaluate the impact of calcareous cementation on the stability of landslides and avalanches by studying its distribution and reinforcement effects.
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Key words:
- karst /
- geological disaster /
- western Hubei Province /
- Qingjiang river basin
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