淤泥质地基闸塘连接段地基处理方式研究

为探讨减小淤泥质地基上修建的水闸与海塘连接段沉降差的措施,在现场调研、现状分析的基础上,结合典型工程,利用有限差分数值模拟软件FLAC3D,分别计算了水闸与海塘连接段采用四种变刚度复合地基处理方式时水闸与连接段之间的沉降差及海塘与连接段之间的沉降差。结果表明:连接段地基采用高压旋喷桩处理时,采用首选同时渐变桩长和桩间距,次选渐变桩长或桩间距,最后选渐变桩径的方案,实现水闸—连接段—海塘之间地基承载力和刚度的平稳变化,既可减小水闸与海塘连接段沉降差,又可降低工程造价。研究成果可为水闸与海塘连接段设计提供参考。

Study on measures for foundation treatment of joint-section between sluice and seawall on silty foundation

In order to inquire into the countermeasures for reducing the settlement difference of the joint-section constructed between seawall and joint-section on silty foundation， the finite difference numerical simulation software FLAC3D is adopted to calculated the settlement difference between sluice and joint-section as well as the settlement difference between sluice and seawall respectively when four variable stiffness composite foundation treatment modes are adopted in joint-section with a typical project on the basis of site investigation and status analysis. The result shows that when the foundation of the joint-section is treated with the methd of high-pressure rotary jet grouting pile， if the scheme， i.e.gradually changing both the pile length or the pile space simultaneously at first， gradually changing pile length or pile space secondly and finally gradually changing the pile diameter is adopted to realize the stable change of the foundation bearing force and stiffness among the sluice， joint-section and seawall， not only the settlement difference of the joint-section between the sluice and seawall can be reduced， but the construction cost can also be lowered. The study result can provide some references for the design of the joint-section between sluice and seawall.