土工基础

›› 2012, Vol. 26 ›› Issue (1): 70-73.

• 工程实录 • 上一篇    下一篇

高压旋喷扩底桩承载机理的现场试验研究

李 斌1，郭克诚1，蒋 冲2，胡毅夫2   

  1. （1.武汉谦诚岩土工程有限责任公司，武汉 430062；2.中南大学资源与安全工程学院，长沙 410083）
  • 收稿日期:2011-11-10 出版日期:2012-02-20 发布日期:2012-03-23
  • 作者简介:李斌，男，1978年生，湖北武汉人，高级工程师，从事高铁工程地基处理技术研究。

Field Studies on the Bearing Mechanism of Belled Columns Formed by Jet Grout

LI Bing1，GUO Kecheng1，JIANG Chong2, Hu Yifu2   

  1. (1.Qiancheng Geotechnical engineering corp. wuhan 430062;2.School of Resources and Safety Engineering, Central South University, Changsha 410083)
  • Received:2011-11-10 Online:2012-02-20 Published:2012-03-23

摘要： 为了研究高压旋喷扩底桩和高压旋喷桩作用机理及加固效果的异同，结合某粮食储备库平房仓车间粮食堆场地基处理工程，详细介绍了工程处理中现场地面沉降、土体变形、桩周土体水平位移、孔隙水压力、桩土应力比、十字板剪切、静力触探、载荷板等试验的现场测试方法与成果。试验结果表明：高压旋喷扩底桩对桩周土体的加固效果比高压旋喷桩明显，尤其是高压旋喷扩底桩的承载能力明显大于高压旋喷桩，采用高压旋喷扩底桩的复合地基承载力满足工程设计要求。

关键词: 桩基础, 复合地基, 高压旋喷扩底桩, 承载机理, 现场试验

Abstract: This case study presents the results of column supported foundation by both the conventional jet grout and the jet grout expanded bases in a soil improvement project for a food storage garages and yards. The ground surface settlements, soil mass deformations, lateral deflections of soil around the columns, excessive pore pressures and the stress ratioes were monitored by the geotechnical instrumentations. The site was also tested by the field vane shear, cone penetration and static plate loading tests before and after the soil improvement. The results indicate that the belled column has a better performance compared with the conventional jot grout columns.

Key words: column supported foundation, composite ground, belled columns formed by jet grout, bearing mechanism, field testing