摘要
查明了广西柳州西南部洛满镇和三都镇岩溶塌陷群的地质环境和分布特征;分析了塌陷形成的影响因素;综合基岩、土层、地下水和已有塌陷等因素,划分了岩溶塌陷易发区域。结果表明:区内岩溶塌陷多具有群发性,主要发生于3~9月份且有逐年增加的趋势;岩溶塌陷的形成受"水-土-岩"相互作用和人为活动影响,区内覆盖土层较薄,地下岩溶发育,地下水在基岩面附近波动,利于塌陷形成;抽排地下水、地下水水位波动是塌陷最主要的诱发因素。岩溶塌陷的高易发区主要分布于洛满镇、流山镇、社冲乡、成团镇、土博镇、三都镇等城镇附近,总面积101.41 km^2;中等易发区(面积142.04 km^2)和低易发区(面积29.16 km^2)较为分散;不易发区为基岩裸露区,面积666.39 km^2。
The geological conditions and distribution characteristics of karst collapse in the Luoman and Sandu town,in Southwest Liuzhou of Guangxi province,were investigated. The factors influencing the formation of karst collapse were then analyzed. The susceptibility region of karst collapse was zoned by the comprehensive analysis of bedrock-soil-groundwater interaction and existing karst collapses. Results show that the karst collapses are close to a form of clustering and mainly occurs between March to September with an increasing trend year by year. The formation of karst collapse is controlled by the specific water-soil-rock interaction and human activities. The thickness of soil layer is thin and the underground karst is well developed. The groundwater level fluctuates in close to the bedrock surface,which is conductive to the formation of karst collapse.The groundwater extraction and the fluctuations of groundwater are the main inducing factor of karst collapse. The high susceptibility zone distributes in the regions of Luoamn,Liu Shan,Shechong,Chengtuan,Tubo and Sandu town,the total area is101. 41 km2. The medium（ 142. 04 km2） and low susceptibility zone（ 29. 16 km2） is disseminative in study area. Karst collapse hardly happens in the exposed area of bedrock with an area of 666. 39 km2.
出处
《地下水》
2017年第6期9-13,37,共6页
Ground water
基金
中国地调局项目(项目编号:12120115047401
12120114022101
DD20160301)
关键词
岩溶塌陷
形成机制
易发程度分区
广西
karst collapse
formation mechanism
partition of susceptibility zone
Guangxi
