Study on Vibro-Replacement Stone Pile Test for Soft Soil Foundation

2014 ◽  
Vol 543-547 ◽  
pp. 3982-3985
Author(s):  
Tie Liang Li ◽  
Jing Meng ◽  
Qiang Zhang ◽  
Gan Zhang ◽  
Lei Fei Deng ◽  
...  
Keyword(s):  
Soft Soil ◽  
Standard Penetration Test ◽  
Reinforcement Effect ◽  
Feeding Mode ◽  
The Earth ◽  
Feeding Type ◽  
Before And After ◽  
Undrained Strength ◽  
Soil Foundation ◽  
Soft Soil Foundation

This paper studies the applicability of vibro-replacement stone pile in combination of a port project in Dalian as well as heavy dynamic sounding and standard penetration test, studies the reinforcement effect of pile distance and feeding type on vibro-replacement stone and analyzes reinforcement effects of the side pile and the earth among piles. The results show: smaller pile distance will bring better pile compactness; for the vibro-replacement stone pile constructed in soft earth with undrained strength less than 20kPa with the conventional method, it is not easy to form compact pile; the reinforcement effect works only within 0.6m on the top; vibro-replacement stone pile with bottom feeding mode can form compact piles, but the pile has the interlayer which is not compact enough partially; the strength of the earth among piles fails to improve obviously before and after the stone pile is formed.

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.

Experimental Research for the Soft Soil Foundation Reinforced by Vibro-Replacement Stone Pile

2014 ◽  
Vol 501-504 ◽  
pp. 101-106
Author(s):  
Hai Ying Hu ◽  
Yu Cheng Zhang ◽  
Zhi Xing Huang
Keyword(s):  
Soft Soil ◽  
Earth Pressure ◽  
Standard Penetration Test ◽  
Load Test ◽  
Composite Foundation ◽  
Penetration Test ◽  
Liquefaction Resistance ◽  
Total Settlement ◽  
Soil Foundation ◽  
Soft Soil Foundation

With the background of the foundation treatment engineering of a river dam in a reservoir, the thesis introduced the site experiments for soft soil foundation reinforced by vibro-replacement stone piles. Moreover, the study had also conducted inspection and analysis of the reinforcing effect of the composite foundation being reinforced by vibro-replacement stone piles including the inspections like the stress ratio between the vibro-replacement stone pile and earth among pile and the ratio between the vibro-replacement stone pile and the pile earth. Finally, the study came to below results after comprehensively considering the results of the heavy dynamic penetration test, standard penetration test, load test, reading of earth pressure cell and etc. The reinforcement of the vibro-replacement stone piles could reach the expected reinforcement effect for the soft earth foundation. After the application of the piles, the carrying fore of the composite foundation is higher than the design requirements and the liquefaction resistance has experienced significant improvement. Moreover, this kind of composite soil foundation could effectively reduce the total settlement of the foundation, accelerate the consolidation of the foundation and improve the hydraulic conductivity of the foundation.

scholarly journals The reinforcement effects of deep soft soil foundation with high degree of saturation under dynamic compaction

2018 ◽  
Vol 10 (6) ◽  
pp. 168781401878263 ◽  
Author(s):  
Jihong Wei ◽  
Yan Men ◽  
Feng Zhu ◽  
Huilin Le ◽  
Haotian Fan
Keyword(s):  
Soft Soil ◽  
Dynamic Compaction ◽  
Degree Of Saturation ◽  
Reinforcement Effect ◽  
Construction Time ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
High Degree ◽  
Deep Soft Soil ◽  
Compaction Method

The dynamic compaction method is effective to reinforce soft soil foundation with a low degree of saturation. However, deep soft soil foundation with high degree of saturation has some different characteristics. It has been widely considered that dynamic compaction method is unsuitable to improve the characters of deep soft soil foundation with high degree of saturation. In this article, we will show that the dynamic compaction method with vacuum well-point dewatering is effective to deep soft soil foundation with high degree of saturation reinforcement. In situ and laboratorial experiments are used to assess the reinforcement effect of the deep soft soil foundation with high degree of saturation. Our results show that the dynamic compaction method causes long dissipation time of pore water pressure, and the dynamic compaction method with vacuum well-point dewatering makes construction time of a project 25% shorter. The effective depth of deep soft soil foundation with high degree of saturation reinforcement using the two experimental methods can reach to 8.0 m. In comparison with the total settlement and layered settlement of the dynamic compaction method with vacuum well-point dewatering, the dynamic compaction method settlement is relatively smaller. For soils with depth of 4 m, the reinforcement effect of dynamic compaction method with vacuum well-point dewatering is obviously superior to dynamic compaction method. Based on these results, we suggest construction procedures for different reinforcement depth of soils and construction time.

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.

Application Research on Composite Foundation of Rammed Soil-Cement Piles Applied in the Da-Guang Expressway from Gu'an to Shenzhou

2013 ◽  
Vol 740 ◽  
pp. 655-658
Author(s):  
Huan Sheng Mu ◽  
Ling Gao
Keyword(s):  
Soft Soil ◽  
Composite Foundation ◽  
Application Research ◽  
Action Mechanism ◽  
Foundation Design ◽  
Soil Cement ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Cement Soil ◽  
Capacity Characteristic

Through the practice of tamped cement soil pile in treatment of soft soil foundation in Guan to Shenzhou section of Daqing-Guangzhou Expressway, the author expounds the action mechanism of rammed soil cement pile, composite foundation design points and calculation method of bearing capacity characteristic value.

Experimental Study of the Rotary Filling Piles with Large-Diameter under the Axial Load

2012 ◽  
Vol 594-597 ◽  
pp. 527-531
Author(s):  
Wan Qing Zhou ◽  
Shun Pei Ouyang
Keyword(s):  
Experimental Study ◽  
Axial Load ◽  
Load Transfer ◽  
Soft Soil ◽  
Large Diameter ◽  
Shaft Resistance ◽  
Tip Resistance ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Deep Soft Soil

Based on the experimental study of rotary filling piles with large diameter subjected to axial load in deep soft soil, the bearing capacity behavior and load transfer mechanism were discussed. Results show that in deep soft soil foundation, the super–long piles behave as end-bearing frictional piles. The exertion of the shaft resistance is not synchronized. The upper layer of soil is exerted prior to the lower part of soil. Meanwhile, the exertion of shaft resistance is prior to the tip resistance. For the different soil and the different depth of the same layer of soil, shaft resistance is different.

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