复杂场地条件下PHC桩沉桩可行性分析评价研究  

Feasibility analysis and evaluation of PHC pile sinking under complex site conditions

作　　者：刘提 王钦 李树卿 孟俊俊 马炜栋 Liu Ti;Wang Qin;Li Shuqing;Meng Junjun;Ma Weidong(Construction Branch of State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 310016,China;East China Electric Power Design Institute Co.,Ltd.,China Power Engineering Consulting Group,Shanghai 200063,China)

机构地区：[1]国网浙江省电力有限公司建设分公司,杭州310016 [2]中国电力工程顾问集团华东电力设计院有限公司,上海200063

出　　处：《工程勘察》2024年第10期15-22,共8页Geotechnical Investigation & Surveying

摘　　要：在PHC桩的施工过程中,会遇到复杂的地质条件,如强风化岩层和深厚的硬黏土,从而导致沉桩过程中可能出现无法顺利沉桩到位等质量事故。本文研究利用GRLWEAP分析程序对软土地区的PHC管桩在穿越强风化岩层和深厚硬黏土等复杂场地下进行沉桩的可行性分析,同时,还将分析结果与现场高应变监测试验的结果进行了综合比较。研究发现:高应变监测结合GRLWEAP工具评估沉桩可行性是关键有效的方法;只要合理选择打桩系统和沉桩工艺,PHC桩在穿越强风化岩层场地方面是完全可行的;PHC桩穿越硬黏性土地基时,桩身损伤主要是由土塞效应引起的环向张力造成的。During the construction process of PHC piles,the complex geological conditions such as strongly weathered rock layers and deep hard clay may be encountered,which may lead to the quality accidents such as inability to successfully sink the piles into the place during the pile sinking process.The GRLWEAP analysis program is used to conduct a feasibility analysis for the pile driving of PHC pipe piles in soft soil areas under complex underground conditions such as strong weathered rock layers and deep hard clay.At the same time,the analysis results are comprehensively compared with the results from the on-site high strain monitoring tests.The study has found that combining high strain monitoring with GRLWEAP tool to evaluate the feasibility of pile driving is a key and effective method;as long as the pile driving system and pile driving technique are reasonably selected,PHC piles are completely feasible in crossing strongly weathered rock formations;when PHC piles pass through hard cohesive soil foundations,the damage to the pile body is mainly caused by the circumferential tension from the soil plug effect.

关 键 词：桩基工程 PHC桩 波动方程可打性分析 高应变动力检测 可行性分析 

分 类 号：TU473[建筑科学—结构工程]