Ultra-soft Ground Improvement Using Air-Booster Vacuum Preloading Method: Laboratory Model Test Study

2021 ◽  
Vol 7 (4) ◽  
Author(s):  
Huayang Lei ◽  
Qingfeng Fang ◽  
Jingjin Liu ◽  
Gang Zheng ◽  
Peng Wang ◽  
...  
Keyword(s):  
Model Test ◽  
Ground Improvement ◽  
Laboratory Model ◽  
Soft Ground ◽  
Vacuum Preloading ◽  
Test Study ◽  
Soft Ground Improvement ◽  
Laboratory Model Test ◽  
Preloading Method

Model test study of a novel vacuum preloading method

2012 ◽  
pp. 483-487
Author(s):  
Shu Xiaowu ◽  
Guo Bingchuan ◽  
Song Xiaoxian
Keyword(s):  
Model Test ◽  
Vacuum Preloading ◽  
Test Study ◽  
Preloading Method

Laboratory Model Test Study of Tunnel Anchor

2014 ◽  
Vol 1065-1069 ◽  
pp. 333-336
Author(s):  
Bing Shen ◽  
Sai Qiong Long ◽  
Jun Chen ◽  
Yong Bing Li
Keyword(s):  
Model Test ◽  
Shear Failure ◽  
Failure Surface ◽  
Tensile Failure ◽  
Laboratory Model ◽  
Pull Out ◽  
Test Study ◽  
Cable Force ◽  
Anchor Design ◽  
Laboratory Model Test

A laboratory model test of tunnel anchor was conducted to investigate its pullout mechanism and bearing capacity. Surface and rock deformation, strain and stress were measured during the entire model test process. The results show that: under pull out load, tensile failure first occurs in top surface rock near the anchor, then shear failure occurs in anchor-rock interface and rock around the anchor. The failure surface is inverted cone from the anchor bottom. Under 50 times design cable force tunnel rock is in elastic stage, suggesting that current tunnel anchor design is quite conservative and can be further optimized.

scholarly journals A New Combined Vacuum Preloading with Pneumatic Fracturing Method for Soft Ground Improvement

2016 ◽  
Vol 143 ◽  
pp. 454-461 ◽  
Author(s):  
Liu Songyu ◽  
Zhang Dingwen ◽  
Du Guangyin ◽  
Han Wenjun
Keyword(s):  
Ground Improvement ◽  
Soft Ground ◽  
Vacuum Preloading ◽  
Soft Ground Improvement

Influence of Bending of Plastic Vertical Drain on Consolidation via Vacuum Preloading

2014 ◽  
Vol 644-650 ◽  
pp. 4826-4830
Author(s):  
Bin Bin Xu ◽  
Shotaro Yamada ◽  
Toshihiro Noda
Keyword(s):  
Ground Improvement ◽  
Ground Surface ◽  
Soft Ground ◽  
Finite Element Analyses ◽  
Vacuum Preloading ◽  
Vertical Drains ◽  
Bending Effect ◽  
Vertical Drain ◽  
Drainage Capacity ◽  
Soft Ground Improvement

The soft ground improvement employing vacuum preloading is widely used in Tianjin. In the application of vacuum preloading, the bending of plastic vertical drains (PVDs) often occurs accompanying the large settlement of the soft ground or the significant shear strain at the ground surface. In order to investigate the influence of bending of PVDs on the ground consolidation, three different bending shapes of PVDs are assumed and a series soil-water coupled finite element analyses are carried out. It is found that: 1) the macro-element method is available to take the bending effect of PVDs into consideration; 2) the bending at the bottom of PVDs has much impact on the consolidation of ground even though the hydraulic gradient at the bottom is much smaller than that at the top; 3) Due to the bending of PVDs at the bottom the drainage capacity is much influenced and the volumetric compression only occurs at the first few layers of the ground.

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