软土地区PHC管桩承载力不足的成因分析与对策

Cause Analysis and Countermeasures for Bearing Capacity Deficiency of PHC Pipe Piles in Soft Soil Region

摘要:

PHC（prestressed high-strength concrete）管桩凭借其单桩承载力高、施工环保高效、应用范围广、工程造价经济、沉桩质量可靠、耐久性能优异等优点被广泛应用于基础设施建设领域，但PHC管桩静载试验不合格现象屡见不鲜。以东莞软土地区某污水处理厂工程PHC管桩静载试验承载力仅为设计值50%的工程事故为研究对象，通过对设计文件、地勘报告及施工记录进行核查，详细分析静载试验原始数据，系统研究了事故成因并提出了针对性的处理对策和后续改进建议。为类似软土地区PHC管桩工程的设计优化和事故处理提供了重要参考。

Abstract:

PHC (prestressed high-strength concrete) pipe piles are widely applied in the construction field of infrastructures due to their notable advantages, such as high single-pile bearing capacity, environmentally efficient construction, wide range of applications, economical project cost, reliable pile-driving quality and exceptional durability. However, the phenomenon of PHC pipe piles failing the static load test is not uncommon. Taking the engineering accident in a wastewater treatment plant (WWTP) project in the soft soil area of Dongguan where the static load test bearing capacity of the PHC pipe pile is only 50% of the design value as the research object, through the inspection of design documents, geological exploration reports and construction records, the original data from the static load test are analyzed in detail, the accident causes are systematically studied, and the targeted treatment countermeasures and the follow-up improvement recommendations are proposed, which provide the important references for design optimization and accident treatment of PHC pipe pile projects in similar soft soil regions.