注浆液水灰比对螺旋桩芯劲性复合桩抗压承载性能的影响研究  

Influence of water cement ratio on the compressive bearing capacity of helix stiffened cement mixing pile

作　　者：丁文龙 宗钟凌 黄蕴晗 庄潇轩 范毅敏 DING Wenlong;ZONG Zhongling;HUANG Yunhan;ZHUANG Xiaoxuan;FAN Yimin(School of Civil and Ocean Engineering,Jiangsu Ocean University,Lianyungang 222005,Jiangsu,China)

机构地区：[1]江苏海洋大学土木与港海工程学院,江苏连云港222005

出　　处：《地基处理》2025年第1期18-24,共7页Journal of Ground Improvement

基　　金：江苏省重点研发计划(社会发展)项目(BE2021681)。

摘　　要：作为一种新型复合桩,螺旋桩芯劲性复合桩(Helix Stiffened Cement Mixing Pile,简称HSCMP)将刚性螺旋桩与柔性水泥土桩进行复合,两种桩体同步施工一次成桩。为探究注浆水灰比(w/c)对HSCMP抗压承载性能及成桩效果的影响,对不同注浆水灰比的HSCMP进行了模型桩加载试验及桩周水泥土射钉试验。结果表明:HSCMP抗压极限承载力及成桩直径随着w/c降低呈增大趋势,当w/c小于0.7时增长趋势变缓;HSCMP桩身各处的水泥土强度波动幅度随着w/c的降低而减小,桩身水泥土强度均匀性提高;w/c降低可显著提升桩身水泥土强度,w/c由0.9降低至0.6时,水泥土强度增幅为98.9%。As a new type of composite pile,helix stiffened cement mixing pile(HSCMP)is a combination of rigid spiral pile and flexible cement-soil pile,with both types of piles constructed simultaneously in a one-step process.In order to explore the influence of grouting water cement ratio(w/c)on the compressive bearing capacity and pile-forming effect,pile loading test and pin penetration test were carried out on HSCMP with different grouting water cement ratios.The results show that the ultimate bearing capacity and pile diameter of HSCMP increase with the decrease of w/c,and the growth trend slows down when w/c is less than 0.7.The fluctuation range of cement soil strength in HSCMP pile decreases with the decrease of w/c,and the uniformity of cement soil strength in pile body increases.The decrease of w/c can significantly improve the cement soil strength of the pile body.When w/c decreases from 0.9 to 0.6,the strength of cement soil increases by 98.9%.

关 键 词：螺旋桩芯劲性复合桩 水灰比 承载性能 成桩直径 射钉试验 桩身水泥土强度 

分 类 号：TU473[建筑科学—结构工程]