后注浆灌注桩在湿陷性黄土中的试验研究  

Experimental test on post grouting filling pile in collapsible loess

作　　者：柳天杰[1] 王焱[1] 刘坤 

机构地区：[1]河南工业职业技术学院建筑工程系,南阳473000 [2]上海现代建筑设计集团申元岩土工程有限公司,上海200001

出　　处：《建筑结构》2016年第16期97-100,共4页Building Structure

摘　　要：在自重湿陷性黄土地区,通过现场试验及监测对比了普通灌注桩和桩端后注浆灌注桩在设计荷载作用下的桩身轴力和桩侧阻力的变化情况,并通过桩基(竖向)静荷载试验对各试验桩进行了承载力检测。结果表明,位于该湿陷性黄土场地的干作业钻孔灌注桩在后注浆后承载力明显提高,桩身中性点位置下降,同时提供了桩端后注浆灌注桩承载力估算时桩侧阻力增大系数的取值。In the self weight wet collapsible loess area,field test and monitoring were carried out to compare changes of pile body axial force and pile side frictional resistance of the common filling pile and the pile end post grouting filling pile under the design load. And the bearing capacity tests were carried out on test piles through pile foundation（ vertical） static loading test. The results show that the bearing capacity of dry drilling filling pile in the wet collapsible loess area is significantly improved after grouting and the neutral point of pile body decreases. At the same time,the value of pile side friction resistance enhancement coefficient is provided in bearing capacity estimation of pile end post grouting filling pile.

关 键 词：湿陷性黄土 桩基 后注浆 静荷载试验 中性点 桩侧阻力增大系数 

分 类 号：TU473.1[建筑科学—结构工程]