Comparisons of Model Tests Between Vacuum Preloading on Twice Setting of Prefabricated Vertical Drains and Two-Stage Zonal Vacuum Preloading on Prefabricated Vertical Drains

WU Jianqi; OUYANG Cailu; FU Hongtao; XU Shiwei; LYU Youchang

doi:10.13204/j.gyjzG21090606

Volume 53 Issue 1

Jan. 2023

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Li Yuqi, Xie Kanghe. PREDICTION AND ANALYSIS OF DEFORMATION OF DEEP EXCAVATION[J]. INDUSTRIAL CONSTRUCTION, 2004, 34(9): 19-21,80. doi: 10.13204/j.gyjz200409006

Citation:

WU Jianqi, OUYANG Cailu, FU Hongtao, XU Shiwei, LYU Youchang. Comparisons of Model Tests Between Vacuum Preloading on Twice Setting of Prefabricated Vertical Drains and Two-Stage Zonal Vacuum Preloading on Prefabricated Vertical Drains[J]. INDUSTRIAL CONSTRUCTION, 2023, 53(1): 207-211,222. doi: 10.13204/j.gyjzG21090606

Li Yuqi, Xie Kanghe. PREDICTION AND ANALYSIS OF DEFORMATION OF DEEP EXCAVATION[J]. INDUSTRIAL CONSTRUCTION, 2004, 34(9): 19-21,80. doi: 10.13204/j.gyjz200409006

Citation:

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Comparisons of Model Tests Between Vacuum Preloading on Twice Setting of Prefabricated Vertical Drains and Two-Stage Zonal Vacuum Preloading on Prefabricated Vertical Drains

doi: 10.13204/j.gyjzG21090606

1. School of Architectural and Surveying & Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China;
2. College of Architecture Engineering,Wenzhou University, Key Laboratory of Soft Soil Foundation and Engineering Technology of Zhejiang Province, Wenzhou 325035, China;
3. Wenzhou Oufei Development and Construction Investment Group Co., Ltd., Wenzhou 325024, China

Received Date: 2021-09-06
Available Online: 2023-05-25
Publish Date: 2023-01-20

Abstract

Abstract

In order to solve the problem that prefabricated vertical drains (PVDs) are prone to be silted and lead to poor soil reinforcement effect and non-uniform consolidation in the process of treating soft soil by vacuum preloading with prefabricated vertical drains, a comparative model test between vacuum preloading on twice setting of prefabricated vertical drains and two-stage zonal vacuum preloading on prefabricated vertical drains was conducted. By comparing the indexes of site soil involving subsidence, cross-plate vane shear strength and the water content treated by the above two methods, the improvement effect of the two methods was explored. The test results showed that the maximum subsidence of vacuum preloading on twice setting of prefabricated vertical drains and two-stage zonal vacuum preloading on prefabricated vertical drains was 208 mm and 170 mm respectively; the average cross-plate vane shear strength of soil improved by the two methods were 29.5 kPa and 24.75 kPa respectively. It showed that the improvement effect of vacuum preloading by twice setting of prefabricated vertical drains on ultrasoft soil was better than that by two-stage zonal vacuum preloading on prefabricated vertical drains.

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References

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