高真空击密法处理曹妃甸吹填土的应用研究  

Dynamic Compaction under High Vacuum Condition in Strengthening of Dredged Soils

作　　者：杜英辉 陈雷 张尧禹[3] 马坤[3] 沈宇鹏 DU Yinghui;CHEN Lei;ZHANG Yaoyu;MA Kun;SHEN Yupeng(Tangshan Caofeidian Railway Construction Co.Ltd.,Caofeidian 063200;Port of caofeidian Group Co.LTD.,Caofeidian 063200;CCCC Highway Consultants Co.Ltd.,Beijing 100088)

机构地区：[1]唐山曹妃甸铁路建设有限公司,河北曹妃甸063200 [2]曹妃甸港集团有限公司,河北曹妃甸063200 [3]中交公路规划设计院有限公司,北京100068

出　　处：《土工基础》2019年第5期536-540,共5页Soil Engineering and Foundation

基　　金：唐山市科技计划项目(10130204C-1)

摘　　要：依托曹妃甸地区吹填土地基处理工程,阐述了高真空击密法的加固机理和关键工艺;针对该地区工程地质特点,对比了强夯和真空预压法适用范围,确定高真空击密法为该地区的施工方法,并研究了施工过程中不同深度的土压力和孔隙水压力变化特征。结果表明:高真空击密法可以有效缩短施工工期,减少工程造价,强夯与真空排水相结合的工艺可以快速排出孔隙水和消散超孔隙水压力,具有较好的处理效果;该研究成果可以指导施工点夯的时间间隔设置,将点夯时间设置为9 d,超孔隙水压力完全消散后进行点夯处理效果最佳。This paper introduces the principles and key aspects of dynamic compaction under high vacuum conditions from a case history of strengthening of dredged soil in Caofeidian area.The applicable soils and condition for dynamic compaction and vacuum surcharge methods are reviewed separately.It was decided to use the combination of dynamic compaction and vacuum surcharge methods for the soil improvement.The earth pressures and excess porewater pressure changes at various depths are evaluated during the construction.The results indicate that,the dredged soils are improved by the combinaton of dynamic compaction and high vacuum surcharge methods could have the advantage of good improvement,cost effective and construction schedule saving.The optimum time interval between the two passes of dynamic compaction is 9 days so that the pore water pressure between two adjacent compaction craters could be effectively dissipated.

关 键 词：吹填土 高真空击密法 土压力 孔隙水压力 效果评价 

分 类 号：TU472[建筑科学—结构工程]