摘要
为了对岩溶发育区的场地稳定性进行评价,以京杭大运河徐州段某码头场地为例,从场地工程地质特性出发,对场地地基稳定性影响因素进行分类,并划分为岩溶地面塌陷、饱和砂(粉)土液化及软土沉陷三种影响因素,在此基础上结合模糊数学方法对场地岩溶发育程度进行定量分析。研究结果表明:研究区岩溶地面塌陷模糊判别指数W值介于0.25~0.75之间,属相对稳定亚区;饱和砂(粉)土场地液化指数小于6,场地液化分区属轻微液化区;软土分布不均,且厚度变化大,可采用提前加载压固处理消除影响。研究成果为类似岩溶发育地区的稳定性评价提供可行的参考经验。
In order to evaluate the site stability of the karst development area,taking a dock site in the Xuzhou section of the Beijing-Hangzhou Grand Canal as an example,the factors affecting the stability of the site foundation are classified according to the site engineering geological characteristics,and are classified into three influencing factors such as karst ground collapse,saturated sand or soil liquefaction and soft soil subsidence.On this basis,the karst development degree of this site is quantitatively analyzed by combining fuzzy mathematics method.The results show that the W-value of karst ground collapse in the study area is between 0.25~0.75,which is a relatively stable sub-area;the liquefaction index of saturated sand or soil is less than 6,which is a light liquefaction area;soft soil is unevenly distributed and its thickness varies greatly,and the influence can be eliminated by using the pre-loading and pressing treatment.This research results provide a feasible reference experience for the stability evaluation of similar karst development areas.
作者
刘彬
徐坤
LIU Bin;XU Kun(The Second Geological Engineering Investigation Institute of Jiangsu Province,Jiangsu Xuzhou 221000,China)
出处
《地质装备》
2019年第4期29-33,共5页
Equipment for Geotechnical Engineering
关键词
地基
稳定性
岩溶
塌陷
模糊数学
foundation stability
Karst collapse
fuzzy mathematics
liquefaction index
