粉质土中PHC管桩打入性状研究  

DRIVING BEHAVIORS OF PHC PIPE PILE IN SILTY SOIL

作　　者：王晨[1] 光洪峰 吕伟 WANG Chen;GUANG Hongfeng;LV Wei(School of Civil Engineering,Qingdao University of Technology,Shandong Qingdao 266033,China)

机构地区：[1]青岛理工大学,山东青岛266033

出　　处：《低温建筑技术》2022年第5期105-108,共4页Low Temperature Architecture Technology

摘　　要：文中通过现场足尺试验及静载荷试验监测粉土地基锤击沉桩过程中的锤击数及土塞高度的变化,分析了锤击数与地层强度的关系及沉贯过程中土塞效应。结果表明PHC管桩沉桩的锤击数可以反映出地基土的强度;连续的打桩会降低土体强度,利于沉桩;随着打入深度的增加,土塞高度不断增加;土塞率及土塞增长率均呈现先减小后增大的趋势,这与上部粉土下部砂土的土层结构有关;PHC管桩的荷载-沉降曲线为缓变型;为粉砂复合地层锤击沉桩的可打入性分析及评估土塞效应提供参考。The change of hammer number and soil plug height in the process of hammer driving pile in powdery soil foundation is monitored by the in-situ full-scale test and static load test.The relationship between hammer number and stratum strength as well as the soil plug effect in the process of penetration is analyzed.The results show that the hammer blow number of PHC pipe pile has a relation to the strength of foundation soil.Continuous pile driving re⁃duces the strength of soil and facilitate pile driving.With the increase of penetration depth,the plug height increases continuously.Both soil plug rate and soil plug growth rate decrease first and then increase,which is related to the soil structure of upper silty soil and lower sandy soil.The load-settlement curves of PHC pile are of the slow varia⁃tion type.It provides a reference for analysis of driving ability of pile driven by hammer in silty sand composite stra⁃tum and evaluation of soil plug effect.

关 键 词：开口PHC管桩 锤击沉桩 锤击数 土塞 

分 类 号：TU473.1[建筑科学—结构工程]