A Field Study of Reinforcing Soft Foundation by Vacuum Preloading Method

SONG Xue-lin; QI Jian-feng; LI Duo; XIE Yong-ping

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A Field Study of Reinforcing Soft Foundation by Vacuum Preloading Method

- A Field Study of Reinforcing Soft Foundation by Vacuum Preloading Method
- Bulletin of Soiland Water Conservation Vol. 28, Issue 4, Pages: 11-15(2009)
- 作者机构：
  
  1. 石家庄经济学院工程学院,河北,石家庄,050031
  2. 河北省水资源可持续利用与开发重点实验室,河北,石家庄,050031
- 作者简介：
- 基金信息：
- DOI：
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- Published：2009
- 稿件说明：
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SONG Xue-lin, QI Jian-feng, LI Duo, et al. A Field Study of Reinforcing Soft Foundation by Vacuum Preloading Method[J]. Bulletin of Soiland Water Conservation, 2009, 28(4): 11-15.
DOI：

SONG Xue-lin, QI Jian-feng, LI Duo, et al. A Field Study of Reinforcing Soft Foundation by Vacuum Preloading Method[J]. Bulletin of Soiland Water Conservation, 2009, 28(4): 11-15. DOI：

摘要

结合上海某机场跑道真空预压加固软基的试验成果，对加固试验区的地表沉降及其估算方法，不同深度处的超孔隙水压力消散和加固效果等方面进行了研究。结果表明，加固区土体沉降从大到小依次为场地中央、场地边缘和场地角落，反映出真空预压的空间效应;当真空度发生变化时，加固区竖向排水体负压沿深度的分布基本一致，负压范围集中在58∼65kPa，约占膜下真空度的68%∼76%;该地基表面沉降能够联合竖向等效渗透系数、一维太沙基固结理论和分层总和法进行估算。

Abstract

Through studying the experimental results on reinforcing soft foundation by vacuum preloading on an airdrome runway in Shanghai City

surface settlement and its calculation method

dissipation of excessive pore water pressure

and reinforcing effects on test zone are discussed. The testing data indicate that the setdement in test zone

from large to small

is observed in center

margin

and corner of site and this reflects the effects of vacuumpreloading method.When vacuum degree changes

the distribution of suction pressure with depth in drained body of test zone is almost equal.The range of suction pressure is 58-65 kPa

i.e.

68%-76%of vacuum degree under seal membrane. Furthermore

the analysis show that the estimation of surface settlement of soft foundation may be carried out through combining vertical equivalent penetration co-efficient

Terzaaghi's one dimensional-consolidation theory

and layerwise summation method.

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