摘要
曹妃甸国际生态城位于河北省唐山市,该地区基底位于淤泥质粉质黏土层的一层地下车库采用地基处理或桩基础。本文通过对该地区某项目地基持力层淤泥质粉质黏土的勘探取样、原位测试及室内试验,综合分析了该软土地基处理前后的承载力,在天然状态下可达到70 kPa;对比分析了软土层强夯前后的检测结果,管井降水并不能降低软土的含水量,强夯对软土加固效果有限;施工扰动对软土强度影响较大,机械挖土的影响深度可达1.2~1.8 m;减小施工扰动、充分晾晒能够保证软土地基承载力的发挥,素土掺水泥换填对橡皮土处理效果较好。本文的软土地基加固处理实践可为曹妃甸国际生态城地区的同类工程提供参考。
Caofeidian International Ecological City is located in Tangshan City,Hebei Province.Ground treatment or pile foundation is adopted for the 1-storey underground garage whose base is located on the mucky silty clay layer.The bearing capacity of the soft clay foundation was comprehensively analyzed through the exploration sampling,in-situ test and laboratory experiments of the mucky silty clay in the foundation bearing layer of a project in Caofeidian area,which can reach 70 kPa in the natural state.Comparative analysis of the test results before and after dynamic compaction of the soft clay reveals that pipe well dewatering can not reduce the water content of soft clay,and the effect of dynamic compaction on soft clay reinforcement is limited.Construction disturbance significantly affects the strength of soft soil,with the depth of influence from mechanical excavation reaching 1.2 to 1.8 meters.Reducing construction disturbance and fully airing can ensure the bearing capacity of soft clay foundation,and the replacement of plain soil mixed with cement has a good effect on the treatment of rubber clay.The practice of soft clay foundation reinforcement in this article can provide reference for similar projects in Caofeidian International Ecological City area.
作者
刘来新
LIU Laixin(Beijing Aidi Geological Engineering Technology Co.,Ltd.,Bejing 100144,China)
出处
《地基处理》
2024年第5期520-526,共7页
Journal of Ground Improvement
关键词
软土
地基承载力
强夯
原位测试
地基加固
soft clay
bearing capacity of foundation
dynamic compaction
in-situ test
foundation reinforcement
作者简介
刘来新(1980-),男,浙江安吉人,本科,高级工程师,从事岩土工程技术工作。E-mail:ph99453163.com。
