无锡某大厦深层溶洞地基处理设计与施工方法

Treatment design and construction method of deep karst foundation of a high-rise in Wuxi,Jiangsu Province

无锡某大厦地基青龙群灰岩岩溶发育,范围多在-80^-96 m之间,采用袖阀管注浆法进行处理,经钻探及CT层析物探验证,岩溶溶洞治理效果较佳,最终桩基持力层选用(7)层粉质黏土层,主体封顶3年累计最大沉降3.82cm,治理效果达到预期目的,经济效益明显,具有推广应用价值。

Limestone karst of Qinglong Group has developed between 80 ~ 96 meters below a high-rise in Wuxi City. Sleeve-valve-pipe grouting was used to treat the karst and it is proved to have a good result by way of drilling and geophysical prospecting with computerized tomography. The seventh strata of silty clay was eventually applied in the bearing strata of pile foundation. It is estimated that the maximum subsidence within 3 years after main body completion is 3.82 centimeters. The expected treatment result has been achieved with obvious economic benefits and application potentials.