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高速公路在改扩建过程中,首先需要解决的是如何有效地减小新旧路基之间的差异沉降问题,桩承式加筋地基的处理方法在控制路基拼接沉降差的问题上应用越来越为广泛。通过对桩承式加筋地基的基本构成及其特点进行了介绍,分析了加筋体、桩基、褥垫层及桩周土的协同作用的加固机理和工作机理,提出了高速公路加宽工程中桩承式加筋地基的设计原则和方法。根据广三高速公路改扩建工程沿线的地质条件,采用了桩承式加筋地基对部分软基路段进行了处理,有效地解决了软基路段新旧路基拼接后存在的沉降差异过大的问题,使用效果良好。
In the process of reconstruction and expansion of expressway, the first problem to be solved is how to effectively reduce the differential settlement between the old and new subgrade. The application of pile-supported reinforced foundation in the control of subgrade settlement and settlement difference is more and more widely. Through the introduction of the basic structure and characteristics of the pile-supported reinforced foundation, the reinforcement mechanism and working mechanism of the reinforced body, the pile foundation, the cushion layer and the soil surrounding the pile are analyzed. The widening of the expressway Design Principles and Methods of Pile Foundation Reinforced Foundation in Engineering. According to the geological conditions along the reconstruction and extension project of Guangsan Expressway, the pile-shaped reinforced foundation is adopted to deal with some of the soft foundation sections, which effectively solves the problem of excessive settlement difference after the new and old subgrade are spliced, Use good effect.