福建省大田县桃源镇前厝村岩溶塌陷发育特征及成因分析
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摘要
2017年10月16～17日降雨期间,大田县武陵自然村集中发生覆盖型岩溶塌陷,塌陷主要发育于近南北向西侧山沟和北东向东侧山沟的农田中。其形态以圆形和不规则形为主,以单个陷坑或成群出现,深1～10m不等。研究表明,塌陷的形成是多种不良因素共同作用的产物。研究区浅部岩溶发育,下伏二叠系上统长兴组石灰岩基岩面附近岩溶化程度较高;上部覆盖层薄、结构松散;同时受两组断层控制影响;再加上矿坑开采透水及排水、降雨等诱发了地面塌陷的形成与发展。
During the rainfall period from October 16 to 17,2017,covering Karst collapse occurred intensively in Wuling natural village in Datian city.The collapse mainly occurred in the farmland of the mountain ditch near the south to the west and the mountain ditch near the north to the east.Its shape is mainly round and irregular with single pit or group style,and its depth ranges from 1～10m.The research results show that the formation of the collapse is due to many kinds of adverse factors.The Karst develops in the shallow part of the research area,and the limestone bedrock surface of the Dyas Changxing formation of Upper Permian is highly Karstificated.The upper cover layer is thin and its structure is loose,which is also affected by two sets of faults.In addition,as a result of the flooding and Water inrush of the mining in the pit,the drainage and the rainfall,the ground subsidence finally occurred.
During the rainfall period from October 16 to 17,2017,covering Karst collapse occurred intensively in Wuling natural village in Datian city.The collapse mainly occurred in the farmland of the mountain ditch near the south to the west and the mountain ditch near the north to the east.Its shape is mainly round and irregular with single pit or group style,and its depth ranges from 1～10m.The research results show that the formation of the collapse is due to many kinds of adverse factors.The Karst develops in the shallow part of the research area,and the limestone bedrock surface of the Dyas Changxing formation of Upper Permian is highly Karstificated.The upper cover layer is thin and its structure is loose,which is also affected by two sets of faults.In addition,as a result of the flooding and Water inrush of the mining in the pit,the drainage and the rainfall,the ground subsidence finally occurred.
引文
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[2]雷明堂,项式均.近20年来中国岩溶塌陷研究回顾[J].中国地质灾害与防治学报,1997,8(Z1):1-5.
[3]雷明堂,蒋小珍.岩溶塌陷研究现状、发展趋势及其支撑技术方法[J].地质灾害与环境保护,1998,9(3):1-6.
[4]陈国亮.岩溶地质塌陷的成因与防治[M].北京:中国铁道出版社,1994:30-34.
[5]程星,黄润秋.岩溶地质塌陷的概化模型[J].水文地质工程地质,2002,(6):30-34.
[6]樊秀峰,简文彬,李晖.福建省地质灾害分布规律及对城市建设的影响[C].2009GHMT第7届两岸四地工程师(台北)论坛论文集,2009.
[7]何永金.福建省主要地质灾害的特点、成因及其对策[J].福建地质,1995,(4):263-271.
[8]胡瑞林,王思敬,李焯芬,等.唐山市岩溶塌陷区域风险评价[J].岩石力学与工程学报,2001,20(2):180-189.
[9]高明,蒋小珍,李向全,等.贵港覃塘区岩溶地面塌陷成因与防治对策[J].科学技术与工程,2015,15(10):32-36.
[10]郑智,简文彬.龙岩市岩溶塌陷地质结构及其致塌机理[J].地质灾害与环境保护,2017,28(4):38-43.