|Table of Contents|

Comparative Test Analysis of Vacuum Preloading Reinforcement Effect on Soft Ground in Hydraulic Reclamation Area(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2021年06期
Page:
18-24
Research Field:
软土地基加固与基础工程
Publishing date:

Info

Title:
Comparative Test Analysis of Vacuum Preloading Reinforcement Effect on Soft Ground in Hydraulic Reclamation Area
Author(s):
WANG Zhong-wei
(Shanghai Municipal Engineering Design Institute(Group)Co., Ltd., Shanghai 200092, China)
Keywords:
hydraulic reclamation area;  vacuum preloading;  effective reinforcement depth;  in-situ test;  geotechnical test
PACS:
TU447
DOI:
10.19815/j.jace.2021.08045
Abstract:
In order to study the applicability and reinforcement effect of vacuum preloading on soft soil foundation in coastal hydraulic reclamation area of Wenzhou, combined with the example of vacuum preloading treatment of soft soil foundation of a road project in Wenzhou coastal hydraulic reclamation area, the physical and mechanical indexes of soft soil in hydraulic reclamation area before and after reinforcement were compared and analyzed through indoor geotechnical test and in-situ test. The results show that vacuum preloading can effectively strengthen the soft soil in Wenzhou hydraulic reclamation area, the physical and mechanical indexes of soil within 15 m of the surface were significantly improved after preloading reinforcement, but the reinforcement effect decreases linearly along the depth. After reinforcement, the indoor geotechnical test indexes are improved to some extent, the water content and void ratio are reduced by about 10%, and the compression modulus is increased by about 10%. The field in-situ test index is improved more obviously. The average increase of field vane shear strength and static lateral resistance are about 45% and 40% respectively. The sensitivity index of soil changes little before and after reinforcement, that is, the sensitivity of vacuum preloading reinforcement to soil is not significantly improved. It is technically feasible and economically reasonable to use the traditional vacuum preloading method to strengthen the soil foundation in Wenzhou coastal hydraulic reclamation area, and its effective treatment depth can reach 15 m. Meanwhile, there is an obvious “soil column effect” around the vertical drainage body affected by the low permeability and high viscosity of Wenzhou marine soft soil, so the reinforcement effect of vacuum preloading is uneven in the plane.

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Last Update: 2021-11-01