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PHC管桩桩网结构由加筋土、复合褥垫层和桩土加固区三部分组成,对其加固机理进行研究。通过PHC管桩桩网结构在京沪高铁路基工程中的应用,对PHC管桩桩网结构处理软土地基的施工工艺、质量控制要点及注意事项、加固处理效果进行了详细阐述。实践证明,PHC管桩桩网加固的复合地基具有良好的承载能力,地基沉降满足要求,取得良好效果。
PHC pile pipe network structure consists of reinforced earth, composite cushion and pile soil reinforcement zone of three parts, to study its reinforcement mechanism. Through the application of PHC pipe pile net structure in the construction of Beijing-Shanghai high-speed railway subgrade, the construction technology, quality control essentials and precautions of PHC pipe pile pile net structure treatment are elaborated. Practice has proved that, PHC pipe pile net reinforcement composite foundation has a good carrying capacity, foundation settlement to meet the requirements and achieved good results.