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湖南宁乡煤炭坝镇富家村岩溶地面塌陷成因分析及防治建议
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引用本文:孙锡良,陈亮晶,欧 健,陈文东.湖南宁乡煤炭坝镇富家村岩溶地面塌陷成因分析及防治建议[J].中国岩溶,2018,37(3):421-426. SUN Xiliang,CHEN Liangjing,OU Jian,CHEN Wendong.Cause analyses and prevention suggestions for the karst collapse in the Fujia village of Hunan, China[J].Carsologica Sinica,2018,37(3):421-426.
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作者单位
孙锡良 湖南省地质矿产勘查开发局402队 
陈亮晶 湖南省地质矿产勘查开发局402队 
欧 健 湖南省地质矿产勘查开发局402队 
陈文东 湖南省地质矿产勘查开发局402队 
基金项目:湖南省国土资源厅科研项目(编号:2007-23)
中文摘要:本文依据岩溶地面塌陷理论对宁乡煤炭坝镇富家村岩溶地面塌陷的成因、发展趋势进行了研究。根据勘查发现,研究区岩溶地面塌陷具有分布密度高、塌陷规模大、塌坑回填后稳定性差,具有继续变形甚至再次塌陷的特点。通过对区内地质环境条件分析发现,区内覆盖层厚度较薄,岩溶极为发育,煤炭坝矿区排水形成巨大的降落漏斗,孔隙水与岩溶水存在巨大的水头差,导致区内岩溶地面塌陷的发生。同时,区内开采灰岩矿,形成大面积采空区,对岩溶地面塌陷的发生起到了强大的促进作用:一是提供了巨大的物质储存空间;二是大大减小了物质运移途径。塌坑回填堆积在溶洞的土体受地下水的冲蚀潜蚀发生运移,上方土体失去支撑而不断流入采空区,造成塌坑回填后稳定性差。
中文关键词:岩溶地面塌陷  成因分析  采空区  湖南宁乡
 
Cause analyses and prevention suggestions for the karst collapse in the Fujia village of Hunan, China
Abstract:Based on the theory of karst ground collapse, this work studied the genesis and development trend of the karst ground collapse at the Fujia Village, Ningxiang Coal Mine. Previous surveys show that high distribution density, large collapse scales, poor stability after backfilling, and continual deformation or even collapse again characterize the study area. Analysis of the geological environment conditions reveals that the thickness of the cover layer is relatively thin and karst is developed in this area. Meanwhile a huge falling funnel formed in the drainage of the coal dam mining area. Furthermore, a vast large hydraulic gradient is present between the pore water and karst water, which leads to the occurrence of karst ground collapse in the area. At the same time, a huge goaf formed in the limestone mine within this area, which has greatly promoted the occurrence of karst ground subsidence. And its functions are as follows. First, it provides a huge material storage space. Second, it greatly reduces the material migration path. The soil in the area is transported by the erosion of groundwater. The upper soil loses its support and continuously flows into the goaf, resulting in poor stability after backfilling of the pit and the collapse of the old collapsed pit.
keywords:karst collapse, cause analysis, goaf, Ningxiang
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