Recent development and improvement of vacuum preloading method for improving soft soil

2002 ◽  
Vol 6 (2) ◽  
pp. 79-83 ◽  
Author(s):  
S. L. Zhu ◽  
Z. H. Miao
Keyword(s):  
Soft Soil ◽  
Vacuum Preloading ◽  
Preloading Method

The Application of Vacuum Preloading Method in Soft Soil Foundation Underwater

2014 ◽  
Vol 580-583 ◽  
pp. 209-212 ◽  
Author(s):  
Yu Qin Feng ◽  
Lu Zhang
Keyword(s):  
Soft Soil ◽  
Effective Means ◽  
Construction Technology ◽  
Strength Index ◽  
Engineering Project ◽  
Vacuum Preloading ◽  
Before And After ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Preloading Method

On the basis of engineering project in coastland, this article analyzes the construction technology and reinforcement mechanism of vacuum preloading reinforces soft soil foundation. By indoor soil test of Reinforcement of soil before and after processing, comparing the change of the physical and shear strength index, verify vacuum preloading method underwater is effective means in handing soft ground and provide some experience for regional development and promotion of underwater application of vacuum preloading technology.

Study on Soft Soil Consolidation by Simulate Vacuum Preloading with Computer Tomography

2012 ◽  
Vol 204-208 ◽  
pp. 508-513
Author(s):  
Ling Tao Mao ◽  
Tai Qian Liu ◽  
Li Ming Wen ◽  
Ze Xun Yuan
Keyword(s):  
Computer Tomography ◽  
Triaxial Compression ◽  
Soft Soil ◽  
Stress Path ◽  
Soil Consolidation ◽  
Vacuum Preloading ◽  
Surface Area Ratio ◽  
Shape Factors ◽  
Pore Surface Area ◽  
Preloading Method

In this paper, triaxial compression experiments on remolded soil were carried on by simulated the stress path of vacuum preloading method. With Industrial Computer Tomography(ICT), the pore micro-structure in soil samples on different load phases were studied. The number of pores was decreasing in trend, and pore area gradually became smaller. Shape factors gradually became larger, and the pore shapes were rounded. Direction angle tends to unity, orientation become better. In addition, the relationships between compression and pore surface area ratio, strength with deformation , pore size with shape factor, permeable nature and pore orientation in vacuum preloading process were established.

Research on Settlement and Wavy Failure of Road on Very Soft Soil Foundation

2011 ◽  
Vol 261-263 ◽  
pp. 1370-1373
Author(s):  
Shu Wang Yan ◽  
Li Li Zhang ◽  
Li Qiang Sun
Keyword(s):  
High Frequency ◽  
Design Methodology ◽  
Soft Soil ◽  
Heavy Vehicles ◽  
Vacuum Preloading ◽  
Lower Strength ◽  
Existing Problems ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Preloading Method

Soil foundation in Tianjin Harbor is formed by hydraulic filled materials strengthened by vacuum preloading method, which is still with lower strength and larger compressibility. Large settlement and wavy failure of the roads constructed on such soil foundation are often taking place after two or three years of construction, because of the heavy vehicles running on the roads with high frequency. In order to deal with the existing problems of constructing roads on such very soft soil foundation, the following work is carried out: the displacement characteristics of roads constructed on very soft soil foundation are identified; the design methodology of constructing roads is discussed; the settlement of the constructed roads is calculated with FE methods and the mechanism of wavy failure of the roads on very soft soil foundation is analyzed.

Solutions of Technical Problems in Ultra-Soft Soil Improving Projects

2013 ◽  
Vol 275-277 ◽  
pp. 1398-1402
Author(s):  
Yong Hua Cao ◽  
Chang Quan Yin
Keyword(s):  
Building Materials ◽  
Soft Soil ◽  
Soil Improvement ◽  
New Method ◽  
Vacuum Preloading ◽  
Typical Application ◽  
Prefabricated Vertical Drains ◽  
Technical Problems ◽  
Vertical Drains ◽  
Preloading Method

Ultra-soft soil improvement projects are new trend in present China because of the limitation of construction period. Technical problems occur when traditional vacuum preloading method is applied for ultra-soft soil. This paper firstly gave an analysis of the main technical problems which include construction channel problems for building materials and workers, portion division problems of project area, installation problems of prefabricated vertical drains and formation problems of horizontal drainage cushion. Then solutions for these problems were presented. Based on the solutions and traditional vacuum preloading method, a new method for ultra-soft soil improving was put forward. A typical application of this new method was give at the end of this paper.

The Applied Research of Underwater Vacuum Preloading Method in Soft Soil Foundation

2014 ◽  
Vol 580-583 ◽  
pp. 742-745
Author(s):  
Yu Qin Feng ◽  
Lu Zhang
Keyword(s):  
Soft Soil ◽  
Soft Ground ◽  
Construction Technology ◽  
Engineering Project ◽  
Vacuum Preloading ◽  
Soft Foundation ◽  
Before And After ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Preloading Method

On the basis of engineering project using underwater vacuum preloading method to strengthening the soft foundation, under the specific geological conditionsthis article analyzes the construction technology and reinforcement mechanism of underwater vacuum preloading of the soft soil foundation. By indoor soil test of Reinforcement of soil before and after processing, compared the change and improve of soil shear strength indexes before and after the reinforcement, it is verified that the underwater vacuum preloading method is a effective mean in handing soft ground, and can be further promoted as a means of handling soft ground along the coastal area of China.

Research on Settlement of Road on Very Soft Soil Foundation

2012 ◽  
Vol 433-440 ◽  
pp. 207-214
Author(s):  
Shu Wang Yan ◽  
Li Li Zhang ◽  
Li Qiang Sun
Keyword(s):  
High Frequency ◽  
Design Methodology ◽  
Soft Soil ◽  
Heavy Vehicles ◽  
Vacuum Preloading ◽  
Lower Strength ◽  
Existing Problems ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Preloading Method

Soil foundation in Tianjin Harbor is formed by hydraulic filled materials strengthened by vacuum preloading method, which is still with lower strength and larger compressibility. Large settlement and wavy failure of the roads constructed on such soil foundation are often taking place after two or three years of construction, because of the heavy vehicles running on the roads with high frequency. In order to deal with the existing problems of constructing roads on such very soft soil foundation, the following work is carried out: the displacement characteristics of roads constructed on very soft soil foundation are identified; the design methodology of constructing roads is discussed; the settlement of the constructed roads is calculated with FE methods and the mechanism of wavy failure of the roads on very soft soil foundation is analyzed.

Recent Advance of Horizontal Drainage Cushion in Vacuum Preloading Method

2013 ◽  
Vol 353-356 ◽  
pp. 7-10
Author(s):  
Yong Hua Cao ◽  
Yun Tao Chen
Keyword(s):  
Soft Soil ◽  
Transfer Efficiency ◽  
Vacuum Preloading ◽  
Horizontal Drainage ◽  
Preloading Method

Horizontal drainage cushion plays a key role in vacuum preloading projects. The traditional horizontal drainage cushion is sand blanket which consumes large amount of sand and is not enviromentally friendly. Several improvements or modifications of horizontal drainage cushion were developed in engineer practices in recent years. Drainage net was used as horizontal drainage cushion in ultra-soft soil improving projects in order to solve the laying problem of sand blanket. Sand ditch was used to deduce the consumption of sand. Direct vacuum preloading method linked the PVDs and filer tubes together in order to improving the transfer efficiency of pressure and canceled the sand blanket at the same time. Low position vacuum preloading method set horizontal drainage cushion below the surface of the ground in order to cancel the sealing membrane.

Application of Vacuum Preloading for Soft Foundation Treatment in Grain Storage

2012 ◽  
Vol 226-228 ◽  
pp. 1359-1364
Author(s):  
Qi Xia Liu ◽  
Yang Zhao
Keyword(s):  
Mechanical Performance ◽  
Soft Soil ◽  
Grain Storage ◽  
Vacuum Preloading ◽  
Obvious Effect ◽  
Ground Treatment ◽  
Foundation Treatment ◽  
Soft Foundation ◽  
Preloading Method ◽  
Design Construction

The application of vacuum preloading for soft foundation treatment in grain storage is introduced from its principle, design, construction and the inspections. Its obvious effect is proved by example. The vacuum preloading method can effectively improve the soft soil foundation’s physical and mechanical performance and increase the bearing capacity of soft soil of coastal areas. For the grain storage, oil depot especially for large reserves of oil depot project, the treatment effect is remarkable. It can be widely used in the ground treatment in the soft soil area for grain storage, oil depot construction.

Influence of vacuum preloading on vertical bearing capacities of piles installed on coastal soft soil

2018 ◽  
Vol 37 (7) ◽  
pp. 870-879 ◽  
Author(s):  
Jun Wang ◽  
Zhi Zhou ◽  
Hongtao Fu ◽  
Quanyang Dong ◽  
Yuanqiang Cai ◽  
...  
Keyword(s):  
Soft Soil ◽  
Vacuum Preloading ◽  
Vertical Bearing
Sign in / Sign up

Export Citation Format

Share Document