嵌岩PHC桩基试验研究

工程领域采用的PHC桩基多以粘性土、砂性土层为持力层,文中给出了在复杂中软土地基条件下,以风化岩为持力层,进行PHC桩嵌岩试验的工程实例。通过沉桩试验、高应变动测、静载荷试验等,综合讨论了PHC桩实施嵌岩的可行性,总结分析了岩土工程勘察的侧重点,提出了加强桩身强度、优化桩靴设计和控制沉桩锤击力等措施确保嵌岩桩身质量的一些认识。

Study on rock-socketed PHC pile foundation by test

Bearing stratum of PHC piles generally adopts clay and sandy soil in construction project.In the condition of complicated soft soil foundation,this paper makes experiments on rock-socketed PHC pile,which adopts weathered bedrock as bearing stratum.By pile driving test,high-strain dynamic test and static loading test,this paper analyzes the feasibility of PHC pile driven into bedrock.And this paper summarizes the key point of geotechnical engineering investigation and suggests some measures in order to ensure the quality of rock-socketed PHC pile,such as strengthening pile body,optimizing pile shoe and controlling hammer energy.