Abstract
The application of vacuum pressure to a treated area not only induces vertical settlement and inward lateral displacement but also causes the formation of tension cracks near the ground surface. In general, the strain method is applied to calculate the lateral displacement at the boundary of a treated area; however, the influence scope of lateral displacement has not yet been presented. Based on thein situdata of soft clayey soil foundation treated by vacuum consolidation, lateral displacement was estimated in the influence scope in this study. To calculate the influence scope of lateral displacement induced by vacuum pressure, the ratio of the lateral displacement within the influence scope to the ground surface settlement under the centre of the treated area is defined as the maximum value of the lateral displacement (ELD) within the influence scope. This paper proposes a direct relationship between ELD and the distance from the treated area boundary (Lx), considering the length of the prefabricated vertical drain. In addition, the FEA (finite-element analysis) is used to simulate the process of vacuum preloading to reinforce soft soil foundation. The influence scope simulated is almost close to the calculated valueLx. Accordingly, the safety distance between the boundary of the treated area and the surrounding building can be estimated when the soft soil foundation is consolidated by using a vacuum preloading method.
Highlights
Academic Editor: Yongfeng Deng e application of vacuum pressure to a treated area induces vertical settlement and inward lateral displacement and causes the formation of tension cracks near the ground surface
Based on the in situ data of soft clayey soil foundation treated by vacuum consolidation, lateral displacement was estimated in the influence scope in this study
To calculate the influence scope of lateral displacement induced by vacuum pressure, the ratio of the lateral displacement within the influence scope to the ground surface settlement under the centre of the treated area is defined as the maximum value of the lateral displacement (ELD) within the influence scope. is paper proposes a direct relationship between effected lateral displacement (ELD) and the distance from the treated area boundary (Lx), considering the length of the prefabricated vertical drain
Summary
Wenzhou Vocational Secondary School is located in the new district of Oujiang estuary, China. e site of this project is shown in Figure 2. e treated area covers approximately 157,820 m2. E treated area covers approximately 157,820 m2. E field is located in a reclamation area with different thicknesses of dredger fill at the ground surface. For the convenience of construction, the test site should be reinforced using the vacuum preloading method for preliminary shallow layer treatment. During this process, the strengthened depth is approximately 3–5 m. Us, the test site should be further reinforced using a vacuum preloading method again because of the poor engineering properties of soft soil
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