2017年 1O月下
第 46卷 第 20期
施 工 技 术
C0NSTRUCTION TECHNOL0GY 49
DOI:10.7672/s鲥s2O17200049
新 型 集 成 管 井 降 水 强 夯 法 处 理 冲 填 土 地 基 试 验 研 究
范 文 超 ,蔡 新 ,吴 艳 飞 ,刘 培 贵 ,孙 苏 才 ,张 金 良。
(t.河海大学力学与材料学院,江苏 南京 211100;2.南通沿海开发集团城镇建设有限公司,
江苏 南通 226006;3.南京瑞迪建设科技有限公司,江苏 南京 210098)
[摘要]考虑长三角沿海地区吹填软基实际工程性质,采用新型集成管井降水联合强夯加固技术进行某滨海工业
园区试验段软基处理。新型集成管井降水装置可增加主动降水能力,大大加快了孑L隙水的排出和超孔隙水压力的
消散 ,并可使超孔隙水压力降至负值,减小地基侧向位移。通过监测水位、孔隙水压力 、侧向位移和沉降,及时了解
加固效果 ,进一步探究加固机理。试验表明:第 1,2遍点夯分别采用 1 250kN·m和2 000kN·m的夯击能,夯击次数
为 2~3次,夯实效果最佳 ;超孔隙水压力消散比较快,消散速率随深度增加而减小 ,第 2遍强夯过后孙隙水压力消
散速率比第 1遍大。最后通过检测,地面以下5m深度地基得到充分加固,地基承载力达到 100kPa,完成了试验既
定目标。
[关键词]井点降水;强夯法;试夯;监测;加固
[中图分类号]TU471.8 [文献标识码]A [文章编号]1002—8498(2017)20·0049-05
Experim ent Research of Dynam ic Consolidation M ethod with New Type
W eIl-points Dewatering in Dredger-filled Soft Foundation Treatm ent
FAN Wenchao ,CAI Xin ,WU Yanfei ,LIU Peigui ,SUN Sucai ,ZHANG Jinliang
(1.Hohai University,Mechanic and Material College,Nanjing,Jiangsu 21 1 100,China;2.Nantong
Coastal Development Group,Nantong,Jiangsu 226006,China;3.Nanjing Ruidi Construction
Technology Co.,Ltd.,Nanjing,Jiangsu 210098,China)
Abstract:Considering the actual engineering properties of soft foundation in the coastal area of Yangtze
River Delta,the new type integration of well-points dewatering combined with dynamic compaction
reinforcement technology is used to treat soft foundation in the test section of a Binhai Industrial District.
The continuous drainage capacity of integration of well—point dewatering can accelerate the dissipation of
the excess pore water pressure and reduce the lateral displacement of foundation.To keep abreast of
periodic reinforcement effect and further explore the precipitation mechanism of well—points and dynamic
consolidation by monitoring the water level,pore water pressure,lateral displacement and settlement.Test
shows:the tamping energy of 1 250kN·m and 2 000kN·m are the most effective for first and second
dynamic consolidation construction,the number of the times of compaction is 2~3 times;after the
tamping,the excess pore water pressure is dissipate rapidly and dissipation rate decreases with the
increase of depth,dissipation rate after second tamping is more larger than the first.Finally,through the
detection,the foundation bearing capacity of the ground below 5m depth can reach 100kPa,the test goals
is completed.
Key words:well-points dewatering;dynamic consolidation;trial rammi
新型集成管井降水强夯法处理冲填土地基试验研究(论文).pdf