中国岩溶Issue(1)：79-85,7.DOI:10.11932/karst20150111
无锡某地基埋藏型岩溶发育特征及充填物来源
Development characteristics of buried karst under a foundation in Wuxi and sources of karst fillings
李肖南 1阎长虹 2许宝田 1段成龙 1周殷康1
作者信息
- 1. 南京大学地球科学与工程学院，江苏 南京 210046
- 2. 新疆电力设计院有限公司，新疆 乌鲁木齐 830000
- 折叠
摘要
Abstract
The development characteristics of burial karst and sources of the karst fillings are very important for choosing the location of super-high buildings and bearing strata.This study employed the cross-hole seis-mic CT method to detect the caves and fracture zones of a foundation in Wuxi,and made indoor tests on sam-ples of the karst fillings from the typical karst caves.Combined with the in-situ geological conditions,this paper presents a qualitative analysis of the scale,distribution and development characteristics of the karst and the sources of fillings which are more than 80 meters below the foundation.The results show that the karst is of a small size,the area of most caves is less than 2 m2 ,and there are many layers in the vertical direction. The rate of cave filling reaches 92.7%,and the caves are mostly filled with hard plastic mud which has a large bearing capacity and can be used as the bearing layer of foundation.XRD analysis of mineral composi-tion shows that the minerals of different cave fillings are generally the same,consistent with those of the o-verlying bedrock.Thus,the denudation of overlying bedrock is the main source of these fillings.There is no large connective channel between the caves,and the underground water level has dropped below the caves.It is therefore concluded that these caves will not further develop and pose no threat to the stability of the foun-dation.The results of this study will provide reference for the site selection,design and construction of su-per-high buildings,karst detection,stability analysis of foundations and the treatment of unfavorable geolog-ical bodies in the Suzhou-Wuxi-Changzhou areas,which are located on deep karst foundation.关键词
埋藏型岩溶/跨孔地震CT/溶洞/充填物来源/持力层Key words
burial karst/cross-hole seismic CT method/karst cave/sources of fillings/bearing layer分类
天文与地球科学引用本文复制引用
李肖南,阎长虹,许宝田,段成龙,周殷康..无锡某地基埋藏型岩溶发育特征及充填物来源[J].中国岩溶,2015,(1):79-85,7.
