Model test of drain pile foundation under vacuum preloading

1990 ◽  
Vol 27 (5) ◽  
pp. 273
Keyword(s):  
Model Test ◽  
Pile Foundation ◽  
Vacuum Preloading

scholarly journals Potential of Flocculant-Aided Soil Slurry Dewatering in Land Reclamation: Laboratory Investigations

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Yang Jiao ◽  
Jia He ◽  
Peiyuan Zhou ◽  
Ziqian Cao
Keyword(s):  
Model Test ◽  
Large Scale ◽  
Land Reclamation ◽  
Drainage Water ◽  
Tube Model ◽  
Soil Slurry ◽  
Vacuum Preloading ◽  
Geotextile Tube ◽  
Laboratory Investigations ◽  
Flocculation Effect

When soil slurry is used as a fill material in land reclamation projects, vacuum preloading or geotextile tube systems are often adopted for the dewatering treatment in a large scale. However, these two methods often suffer from clogging problems and impede further dewatering treatment. In this study, we test the potential of using flocculants to enhance the dewatering efficiency in a vacuum preloading model test and a geotextile tube model test. Experimental results show that, by adding a flocculant into soil slurry, the dewatering efficiency in terms of drainage volumes and rates is significantly improved as compared to that in pure soil slurry. The amounts of drainage water in the tests with flocculant addition are about 20% and 100% more than those in pure slurry tests in the vacuum preloading and geotextile tube model tests, respectively. The underlying reason could be the flocculation effect that prevents the movement of small soil grains and the formation of impermeable layers on the filters.

Model Test of Socketed Depth’s Influence on Bearing Mechanism in Rock-Socketed Pile

2011 ◽  
Vol 90-93 ◽  
pp. 332-336
Author(s):  
Rui Gao ◽  
Yan Qiang Wang ◽  
Jun Yan
Keyword(s):  
Numerical Simulation ◽  
Model Test ◽  
Pile Foundation ◽  
Organic Glass ◽  
Silty Sand ◽  
Similarity Principle ◽  
Model Pile

The socketed depth in rock-socketed pile can influence its bearing mechanism largely. At present the numerical simulation is used to study the socketed depth’s influence on pile’s bearing mechanism. It can reveal the pile bearing mechanism in some degree; however, there are some defects and limitations in simulation for its assumptions and simplifications. Based on the pile foundation of Tian-xing-zhou Bridge, the model test is conducted to study the socketed depth’ influence on rock-socketed pile bearing mechanism. In the model test, the socketed depth of model piles are made different ranging from 60mm to 200mm at the step of 20mm, and the bed rock is simulated with mixture of sand and plaster, the rock-soil overlain the bed rock is simulated with silty sand, the pile is simulated with organic glass rod according to similarity principle respectively. The results show that the settlement of top of model pile is smaller and the ratio of point resistance is smaller when the socketed depth is longer. When the socketed depth reaches 5D (D represents diameter of model pile), the ratio of point resistance is no more than 40%, and it is less than 1% when 8D. The conclusions drawed from model test are useful to deciding the length of pile foundation in Tian-xing-zhou Bridge.

scholarly journals Model Test on the Behavior Evaluation of Pile Foundation Subjected to Fault Rupture

2018 ◽  
Vol 18 (1) ◽  
pp. 1_122-1_133
Author(s):  
Chika KAWAZOE ◽  
Ayaka YAMAMURA ◽  
Mina SUGINO ◽  
Hisatoshi KASHIWA ◽  
Yasuhiro HAYASHI
Keyword(s):  
Model Test ◽  
Pile Foundation ◽  
Fault Rupture

Model Test of Using Vacuum Preloading to Improve Dredge

2011 ◽  
Vol 374-377 ◽  
pp. 1908-1911
Author(s):  
Shu Wang Yan ◽  
Qun Hua Zhou ◽  
Li Qiang Sun
Keyword(s):  
Water Content ◽  
Model Test ◽  
Land Reclamation ◽  
Ground Surface ◽  
Soil Improvement ◽  
Field Investigation ◽  
Vacuum Preloading ◽  
Undrained Strength ◽  
Soil Foundation

Dredge materials with the water content more than 80% have been used for land reclamation in Tianjin, China. The dredge is transferred by pipeline to the reclamation place and then strengthened with the vacuum preloading technique. It has been found that with the thickness of the filled dredge layer becomes larger and larger, the quality of soil improvement is not as good as expected. Field investigation shows that after vacuum preloading the vane test strength can reach 50kPa at the ground surface, but decreases along with depth dramatically. The model test is carried out to detect the factors that may influence the efficiency of using vacuum preloading to improve dredge soil foundation. The water content, vacuum pressure and undrained strength are measured during the test.

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