摘要
针对常规水泥土搅拌桩搅拌不充分、混合不均匀等瓶颈,研发了一种四轮三维搅拌钻头,开展了三维水泥土搅拌桩(TCM桩)成桩工艺现场试验,通过桩身的标准贯入试验、芯样无侧限抗压强度及直接剪切试验,将双浆、一气一浆、单浆3种供浆方式形成的TCM桩与四搅四喷工艺形成的常规水泥土搅拌桩进行了对比分析。结果表明,TCM桩不同深度的标准贯入击数、无侧限抗压强度、直剪抗剪强度等指标优于常规水泥土搅拌桩。另外,不同工艺的成桩质量具有明显差异,单浆工艺形成的桩体平均标准贯入击数最大,一气一浆工艺形成的桩体无侧限抗压强度和直接抗剪强度最高。
To overcome the insufficient and uneven mixing of conventional cement-soil mixing pile,a new four wheel three-dimensional stirring drill was developed and field tests for three-dimensional cement-soil mixing(TCM)pile was carried out.The TCM piles formed by three slurry supply methods of double slurry,one air and one slurry,and single slurry were compared and analyzed with the conventional soil-hydraulic mixing piles formed by four churning and four spraying processes through the standard penetration test(SPT)of the piles,the unconfined compressive strength test,as well as direct shear test.The results indicate that the SPT blow count,unconfined compressive strength and shear strength of TCM piles at different depths are better than those of conventional mixing cement-soil pile.In addition,the quality of TCM pile is closely related to its construction technique,where the SPT blow count of the piles by single-pulp slurry supply method is the highest,while the unconfined compressive strength and shear strength of piles by one gas and one slurry method is the highest.
作者
姚达
王希晨
赵虎
邱成春
刘振建
YAO Da;WANG Xichen;ZHAO Hu;QIU Chengchun;LIU Zhenjian(Jiangsu Province Engineering Investigation and Research Institute Co.,Ltd.,Yangzhou 225000,China;The Eastern Route of South-to-North Water Diversion Jiangsu Water Resource Co.,Ltd.,Nanjing 210029,China;Jiangsu Hongji Water Technology Co.,Ltd.,Yangzhou 225000,China;Xuzhou Branch of the Eastern Route of South-to-North Water Diversion Jiangsu Water Resource Co.,Ltd.,Xuzhou 221018,China;School of Civil Engineering,Yancheng Institute of Technology,Yancheng 224051,China)
出处
《江苏水利》
2023年第7期63-67,共5页
Jiangsu Water Resources
基金
江苏省水利科技项目(2020012),江苏南水北调科技研发项目(JSNSBD202106)。
关键词
TCM桩
成桩工艺
供浆方式
常规水泥土搅拌桩
现场试验
TCM pile
construction technique
slurry supply method
conventional cement-soil mixing pile
field tests
