土工基础

›› 2016, Vol. 30 ›› Issue (5): 538-540.

• 工程实录 • 上一篇    下一篇

柱锤冲扩桩处理湿陷性黄土地基效果研究

王 永1,2   

  1. （1.兰州交通大学土木工程学院，兰州 730070；2.甘肃省道路桥梁与地下工程重点实验室，兰州 730070）
  • 收稿日期:2015-11-11 修回日期:2015-11-28 出版日期:2016-10-20 发布日期:2016-10-31
  • 作者简介:王 永（1990-），男，硕士研究生。研究方向为隧道与地下工程。

Effect the Expanded Base Columns Formed by Percussive Poundings in Loess Soils

WANG Yong1,2   

  1. (1.School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou, 730070;
    2.Key Laboratory of Road & Bridge and Underground Engineering of Gansu Province, Lanzhou, 730070)
  • Received:2015-11-11 Revised:2015-11-28 Online:2016-10-20 Published:2016-10-31

摘要： 在湿陷性黄土地区修建要求较高客运专线必须要消除湿陷性和改善土体各项力学指标。以新建兰州西客站作为试验工点，采用水泥土柱锤冲扩桩处理地基。结果表明：水泥土柱锤冲扩桩复合地基能够满足地基承载力的要求，消除黄土湿陷性，降低桩间土的压缩系数达到50%以上，并提高桩间土的干密度达到22.5%以上。

关键词: 水泥土, 柱锤冲扩桩, 湿陷性黄土, 压缩系数

Abstract: In additional to the highly compressible, well developed porous system, the loess has its unique characteristics of collapse after wetting. The collapsibility of the collapsible loess is required to be eliminated and the other mechanical properties need to be improved for the construction of passenger rail projects. This paper presents a case history of loess soil improvement in Lanzhou West Passenger Station using cement mixed soil columns with expanded base formed by the percussive poundings. The results indicate that this expanded base columns can effectively improve the loess soil properties in the bearing capacity, eliminating the collapsibility. The test results also show that the compressibility coefficient of soil between columns can be reduced by 50% and the dry density can increase as high as 22.5%.

Key words: Cement Mixed Soils, Percussive Pounding formed Expanded Base Columns, Collapsible Losses, Compressibility Coefficient