Experimental Study on Air-boosted Vacuum Preloading of Soft Station Foundation
Experimental Study on Air-boosted Vacuum Preloading of Soft Station Foundation
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发表时间：
2011
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通讯作者：
Lian Zhi
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作者：
Lian Zhi
常规的真空预压法施工周期长、排水效果差，不能满足车站轨道地基的设计和施工要求。介绍了某车站地基采用空气增压式真空预压的施工方法，并在现场设置了4种不同设计方案的试验段，对不同设计方案的沉降进行了实测和比较。试验结果表明：增压式预压增大了预压过程中的沉降量，缩短了固结时间;沉降增量主要产生在增压管埋深2 m以下，约占总沉降量的70%;空气增压处理有效地降低了真空预压区的地下水位，加速了软基的固结。
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.