摘要
淤泥质土具有高压缩性、高含水量、高灵敏、易扰动、低强度等特性,拟建场区处于白泉泉域的排泄区,受下部承压岩溶水顶托补给,赋存于上部厚层淤泥质粉质黏土中的第四系水具微承压性。下部粉土层为承压含水层,承压水头与潜水水头基本一致,并且在一定程度上接受下部岩溶水越流补给,为中等透水层,若不能较好地处理承压水,基坑突涌风险较大。特殊的水文地质条件,改变了淤泥质粉质黏土的岩土物理力学性质,对基坑的围护结构及基底的加固措施要求较高,影响着施工方案的选择。
The engineering properties of mucky silty clay have the following features: high compressibility, high moisture content, high sensitivity, easily to be disturbed and low shear strength. A proposed site is located at the outlet area of the Baiquan Springs. The thick Quaternary mucky silty clay overlays the silt soil and karst rock cavities and pinnacles which the slight artesian groundwater flows. The lower silt layer is a medium permeable artesian aquifer which receives the water head from lower groundwater flows. If the appropriate engineering measures are not applied in the mucky silty clay layer during the foundation construction, the occurrence of the groundwater gushing hazard is relatively high. It is concluded that the engineering properties of the mucky silty soils are changed under this special hydrological condition and therefore, the supporting structure for the deep excavation and the bottom soils improvement need to be appropriately considered.
作者
王洪祯
雷炳霄
宫亮
丁庆忠
WANG Hongzhen;LEI Bingxiao;GONG Liang;DING Qingzhong(Shandong Provincial Geo-mineral Engineering Exploration Institute,Jinan 250014)
出处
《土工基础》
2020年第2期165-167,共3页
Soil Engineering and Foundation
关键词
淤泥质粉质黏土
微承压性
白泉
岩溶水
mucky silty clay
slight artesian groundwater
baiquan spring
groundwater in karst rock cavities and pinnacles
