摘要
武广客运专线韶关至花都段约45%的线路为可溶岩地段,沿线岩溶较发育,且多为覆盖型岩溶,线路对路基变形稳定问题要求很高。通过对其中英德段沿线覆盖型岩溶分布区内1943个勘探钻孔资料的统计、分析,总结出了沿线覆盖型岩溶的结构特征,以及地下岩溶集中在埋深为0～30m、30～60m、60～110m的三个垂向分层上,具有明显的成层性;岩溶发育受可溶岩岩性的严格控制,在平面上呈现出极不均匀的现象。在此基础上,研究得到岩溶塌陷发育受基岩岩性的明显控制,主要发育在覆盖土层厚度小于15m的地区,地下水位的变化也会给岩溶塌陷提供一定的动力条件。
About 45% of the section from Shaoguan to Huadu of the Wuhan-Guangzhou passenger special line has the basement made up of soluble rock. The karst along the line is well developed, mostly of the cover type. Thus this line highly requires embankment stability. By statistics and analysis on data of 1943 exploration drillings in the cover-type karst distribution area along the Yingde section, structural features of the karst are summarized. These rocks are concentrated at three layers in the subsurface with depths 0 - 30m,30 - 60m, and 60 - 110m, respectively, indicative of a layered property. Karst development is strictly controlled by soluble rock lithology, showing a very heterogeneous phenomenon in plane. On this basis, the further research concludes that the karst collapse is controlled by the bedrock lithology, and mainly developed in the area with cover thickness less than 15m, and groundwater level changes can provide karst collapses with a dynamic condition.
出处
《地质与勘探》
CAS
CSCD
北大核心
2011年第4期699-704,共6页
Geology and Exploration
关键词
武广客运专线岩溶发育规律岩溶塌陷
Wuhan-Guangzhou passenger special line, regularity of karst development, karst collapse
