| 广东英德沙口镇岩溶地面塌陷发育特征及形成机理分析 |
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| 引用本文： | 赵建军.广东英德沙口镇岩溶地面塌陷发育特征及形成机理分析[J].中国地质灾害与防治学报,2022,33(5):59-65. |
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| 作者姓名： | 赵建军 |
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| 作者单位： | 广东省化工地质勘查院，广东 广州 510800 |
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| 基金项目： | 广东省地勘事业发展经费（粤财工[2019]169号）；2019年清远市级地质灾害防治专项资金（清财农[2019]47号） |
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| 摘 要： | 近年，广东省粤北山区隐伏区岩溶地面塌陷日益增加，直接影响人民生产生活。英德市沙口镇某村地质环境复杂，第四系覆盖层厚度薄，底部卵石层与下覆天子岭组灰岩直接接触，溶洞与断层破碎带发育，溶洞与溶洞间连通性较好，岩溶地面塌陷地质灾害严重。在综合分析沙口镇某村地质环境条件基础上，从内、外两方面因素，对岩溶地面塌陷发育特征及形成机理进行分析，认为在长期地下水位波动、潜蚀及淘蚀等作用松散盖层土体颗粒流失形成土洞，地表水与地下水强烈交替形成正负压力等作用下，土洞上部盖层发生塌陷。研究结论为科学制定岩溶地面塌陷防治方案提供依据。
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| 关 键 词： | 岩溶地面塌陷 地质环境条件 发育特征及形成机理 正负压力 |
| 收稿时间： | 2021-09-17 |
Analysis on development characteristics and formation mechanism of karst collapse in Shakou Town,Yingde City of Guandong Province |
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| Institution: | Chemical Industry Geological Prospecting Institute of Guangdong Province , Guangzhou, Guangdong 510800, China |
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| Abstract: | In recent years, the collapse of hidden karst ground in the mountainous area of north Guangdong Province is increasing, which directly affects people's production and life. In a village of Shakou Town, Yingde City, where the geological environment conditions are complex and the quaternary overburden is thin, serious geological disaster of karst ground collapse has occurred due to the development of the karst cave and fault fracture zone and the connectivity between karst cave and karst cave. The direct contact between the bottom pebble layer and the overlying limestone of Tianziling Formation also accounts for the disastrous consequence. Based on the comprehensive analysis of the geological environment conditions of the village in Shakou Town, the development characteristics and formation mechanism of karst ground collapse from internal and external factors were analyzed. It is concluded that the loose cavern is formed by the loss of soil particles in the loose cavern under the interaction of long-term fluctuation of groundwater level, erosion and scouring; the strong alternation of surface water and groundwater forms the positive and negative pressure action; the ground collapse is caused by the loss of bearing capacity of the upper cavern. The conclusion of the research provides sufficient basis for making projects of preventing karst ground collapse scientifically. |
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