黏性土塑性指数对后注浆桩侧阻力的影响  

Effects on Plasticity Index of Cohesive Soil on Lateral Resistance of Post-grouting for Cast-in-situ Pile

作　　者：杨笑男 孙怀军 李连营 宋士杰 Yang Xiaonan;Sun Huaijun;Li Lianying;Song Shijie(Tianjin Survey Design Institute Group Co.,Ltd.)

机构地区：[1]天津市勘察设计院集团有限公司,天津市300191

出　　处：《勘察科学技术》2023年第2期6-9,共4页Site Investigation Science and Technology

摘　　要：该文通过对天津地区多个工程中后注浆钻孔灌注桩桩身埋设电阻式钢筋应变计所取得的试验数据,分析桩侧注浆效果,反算桩的极限阻力标准值、桩侧阻力变化参数,在与现行桩基规范进行了比较和分析的基础上,重点研究考虑黏性土塑性指数对后注浆效果的影响。通过对大量工程实测数据进行总结分析,找出塑性指数与后注浆增强系数之间的变化关系。通过图像统计法细化黏性土后注浆系数的选取,对提高桩基设计计算的准确性有很大帮助,具有一定的工程应用价值。This paper analyses the effects on grouting in lateral side of the pile and calculates the stand-ard value of the ultimate resistance of the pile and the variation parameters of the pile side resistance through the test data which is obtained from embedding the resistive rebar strain gauge on the pile body of the post-grouting for cast-in-situ pile in multiple projects in Tianjin area.Based on the comparative analy-sis of the current pile foundation code,this paper focuses on the effects on the plasticity index of the clay-ey soil on the post-grouting pile.The changes in the relationship between plasticity index and the post-grouting reforcement coefficients are found through summarizing and analyzing a large number of engineer-ing measured data.The selection of the post-grouting coefficient of cohesive soil is refined by image sta-tistics method,it is a great help to improve the accuracy of pile foundation design and calculation,it has certain engineering practical application value.

关 键 词：后注浆灌注桩 塑性指数 侧阻增强系数 电阻式钢筋应变计 

分 类 号：TU473.1[建筑科学—结构工程]