土工格室+碎石桩处治软土路基设计计算方法

通过对土工格室 碎石桩双向增强体复合地基这一新型地基处治技术的承载机理的分析研究,结合实际工程,以振动沉管碎石桩 土工格室为例,探讨了处治高速公路软土路基的技术方法。在此基础上,针对土工格室垫层与碎石桩复合地基共同工作构成荷载传递和支撑体系以提高地基承载能力的特点,建立了考虑格室体水平加筋作用的土工格室 碎石桩双向复合地基的简化计算模型,并给出了一便于工程应用的双向增强体复合地基承载力设计计算方法。最后将该方法应用于京珠高速公路临长段地基处治实践。理论分析及实际工程实践表明,土工格室 碎石桩复合地基处治软土地基可充分发挥碎石桩的竖向承载能力及土工格室的水平加筋特性,两者共同工作可有效提高地基承载力。

Design Calculation Method for Soft Foundation Treatment by Geocell Mattress and Stone Column

Working mechanisms of a new foundation treatment technology formed by geocell reinforced mattress and stone column were discussed.Combining with a certain engineering project,techniques of treating soft soil foundation of expressway were studied with an example of vibrosinking stone columns and grecell reinforced mattress.This foundation treatment system has an advantage of putting both geocell and stone column into full play on load transfer and support.On the base of that,by considering the horizontal reinforced effect by geocell reinforcement,an appropriate calculation model for stone column composite foundation with geocell reinforcement located over it was set up.Furthermore,a useful design calculation method for this two-direction reinforced composite foundation system was proposed.Finally,this method was employed to design a concrete foundation treatment by geocell mattress and stone column in a certain highway project.Both the mechanism analysis and the real project study indicate that,the foundation system formed by geocell mattress and stone column possess the integrated effects of vertical piles and horizontal reinforcement;the soft soil foundation can be enhanced effectively by this treatment.