(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)

［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。

［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

中图分类号：TU473-1文献标识码：A文章编号：1002-848X(2016)16-0097-04

Experimental test on post grouting filling pile in collapsible loess

Liu Tianjie1， Wang Yan1， Liu Kun2

(1 Department of Architectural Engineering, Henan Polytechnic Institute of Architectural Engineering, Nanyang 473000， China;2  Shen Yuan Geotechnical Engineering Co., Ltd., Shanghai Modern Architectural Design Group, Shanghai 200001, China)

Abstract: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.

Keywords:collapsible loess; pile foundation; post grouting; static load test;  neutral point; pile side resistance enhancement coefficient

作者简介：柳天杰，硕士，讲师，一级建造师，Email:ltj821203@126.com。