Experimental study on air-boosted vacuum preloading of soft station foundation

被引：0
|
作者：
Shen Y.-P. [1 ]
Yu J. [2 ]
Liu H. [2 ]
Li Z. [1 ]
机构：
[1] School of Civil Engineering, Beijing Jiaotong University
[2] Beijing Railway Construction Co. LTD., The Sixth Engineering Bure CREC
来源：
Tiedao Xuebao/Journal of the China Railway Society | 2011年 / 33卷 / 05期
关键词：
Analysis of effect; Soft foundation; Subgrade of station tracks; Vacuum preloading with air pressure boosted;
D O I：
10.3969/j.issn.1001-8360.2011.05.017
中图分类号：
学科分类号：
摘要：
The usual vacuum preloading process cannot meet design and construction requirements of foundations of station tracks because of its long construction periods and poor soil water drainage effect. To overcome those disadvantages, the air boosted type of vacuum preloading was introduced in construction of the foundation of a station. Test sections for four different design alternatives were set up on the construction site to measure and compare the settlement of the surface layer, the settlement by layer, the pore water pressures and ground water levels and to verify the applicability of the air-boosted vacuum preloading technology. The test results show as follows: The booster-type preloading increases the settlement during pre-compaction and shortens the consolidation time; the increment of settlement was mainly generated 2 meters below, the buried depth of the booster tubes, and it occupies about 70% of the total settlement; air-boosting treatment effectively reduces the ground water level in the vacuum preloading area and accelerates consolidation of the soft foundation.
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页码：97 / 103
页数：6
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