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.

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.

scholarly journals Deformation Characteristics of Raising, Widening of Old Roadway on Soft Soil Foundation

Symmetry ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 2117
Author(s):  
Keke Li ◽  
Wenyuan Xu ◽  
Liang Yang
Keyword(s):  
Lateral Displacement ◽  
Soft Soil ◽  
Ground Surface ◽  
Surface Settlement ◽  
Deformation Characteristics ◽  
Construction Methods ◽  
Ground Surface Settlement ◽  
Total Settlement ◽  
Soil Foundation ◽  
Soft Soil Foundation

The deformation characteristics of a raised and widened old Chinese roadway on a soft soil foundation are investigated in this study via finite element numerical simulation. The rules of ground surface settlement, slope foot lateral displacement, and ground surface settlement evolution of the roadbed under three modes (one-time construction of an eight-lane expressway, widened four-lane expressway, and raised/widened four-lane expressway) are compared. The ground surface settlement process of the eight-lane road foundation, which is formed by first widening and then raising the road, is highly complex. The ground surface settlement curve under the old road foundation increases and then decreases. The lateral displacement of the slope foot also interacts with the widening and raising of the eight-lane roadbed foundation. The range of lateral displacement is 70.05, 42.58, 124.81, 104.54 mm. Fifteen years after construction, the total settlement of the raised and widened roadbed is much larger than that of the one built directly. The total settlement values at the center of the two roadbeds are 297.05 and 234.85 mm, respectively. This manuscript provides data support for the reconstruction and expansion of roads on soft soil foundations, for choosing appropriate construction methods to build roads, and for avoiding major road damage, which is of great significance to the construction of road infrastructure in the future.

Study and Analysis on Pile-Soil Stress Ratio of the Composite Foundation of Cement-Soil Mixing Pile under Flexible Foundation

2011 ◽  
Vol 335-336 ◽  
pp. 1145-1150
Author(s):  
Xiao Rong Yang ◽  
Lei Yu Zhang ◽  
Hai Chao Li ◽  
Li Ying Dong
Keyword(s):  
Stress Ratio ◽  
Soft Soil ◽  
Composite Foundation ◽  
Soil Mixing ◽  
Soil Stress ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Flexible Foundation ◽  
Cement Soil ◽  
Friction Pile

In order to analyze the characteristics of pile-soil stress ratio of the composite foundation of cement-soil mixing pile under flexible foundation, this paper points out the displacement mode of friction pile; According to the deformation characteristic of friction pile, ascertain the neutral point of composite foundation. And this paper also derives the exact formula about length-stress ratio which addresses the problem of soft soil foundation according to the deformation co-ordination conditions of the pile composite foundation. The calculation of actual example proves that the formula about pile-soil stress ratio is in accordance with actual measurement number. The pile-soil stress ratio which addresses the problem of soft soil foundation is generally between 2~4. If other conditions keep invariable, pile-soil stress ratio become big when cushion modulus become big. Cushion modulus effect the length-stress ratio greatly.

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 Research on Applied of Cement-Soil Mixing Method Reinforcing Shallow Soft-Soil Foundation in Yinchuan Distric

2013 ◽  
Vol 477-478 ◽  
pp. 572-576 ◽  
Author(s):  
Cai Xia Ma
Keyword(s):  
Soft Soil ◽  
Economic Benefits ◽  
Influential Factors ◽  
Composite Foundation ◽  
Soil Mixing ◽  
Mixing Method ◽  
Points Of View ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Cement Soil

Through tests and application, analyzes influential factors & reinforcement effect and application prospects & economic benefits of cement-soil mixing composite foundation, propounds some points of view for stabilizing & reinforcement soft-soil foundation by cement-soil mixing method especially in Yinchan District combined with constructive situation

Study on the Law of Cement-Soil Mixing Pile Composite Foundation Settlement in Ancient Tower Translocation Project

2017 ◽  
Vol 730 ◽  
pp. 463-472
Author(s):  
Dong Fan Shang ◽  
Tie Cheng Wang ◽  
Wan Ming Qiang ◽  
Lei Qiang Miao
Keyword(s):  
Retention Time ◽  
Soft Soil ◽  
Composite Foundation ◽  
Design Solution ◽  
Foundation Settlement ◽  
Soil Mixing ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Cement Soil ◽  
Translocation Speed

Longxi Tower translocation project is the first case of high-rise ancient tower structure translocation on soft soil foundation in China. Foundation treatment protocol and building materials are essential to control soft soil foundation settlement. Depending on Longxi Tower translocation project, firstly this thesis analyzed and confirmed control factors that impact foundation settlement and deformation; then combing with project experience, it selected cement soil mixing pile composite foundation method to treat soft soil foundation; and finally it confirmed the optimal solution to treat cement soil mixing pile composite foundation through analyzing the settlement law of cement soil mixing pile composite foundation. The analysis indicated that cement soil mixing pile composite foundation settlement are obviously impacted by translocation speed and retention time; foundation settlement and deformation level increase as translocation speed decreases and retention time increases; in the case that foundation settlement difference is not beyond 1/1000 of half the distance of track beams at the bottom of building, a treatment solution was made by analyzing how cement soil mixing pile settlement changes as translocation speed, retention time and other factors. The result showed that this treatment solution saved 42% of project cost more than the previous design solution. The research result of this thesis could be taken as a reference for the future similar projects.

Numerical Simulation of Construction of Super-Large Deep Soft Soil Foundation Pits and Analysis of its Spatial and Temporal Effects

2015 ◽  
Vol 724 ◽  
pp. 79-83
Author(s):  
Xiao Qin Wang ◽  
Ting Ting Sun
Keyword(s):  
Constitutive Relations ◽  
Soft Soil ◽  
Earth Pressure ◽  
Deep Foundation ◽  
Support Structure ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Deep Soft Soil

The constitutive relations of soil in the super-large deep foundation pit project and the law of interaction between soil and the support structure were studied. The excavation of the foundation pit was simulated. The coupling of soil and the support structure and the change in earth pressure with the progress of excavation were analyzed, and the scope of influence of foundationsubsidence was obtained.

Mechanism and Application on Extra-Long Sand Wells for Deep Soft Foundation Treatment in Highways

2011 ◽  
Vol 250-253 ◽  
pp. 3128-3133
Author(s):  
He Cheng Liang ◽  
Li Jia Chang ◽  
Ai Guo Zhou
Keyword(s):  
Soft Soil ◽  
Monitoring Data ◽  
Dynamic Monitoring ◽  
Foundation Treatment ◽  
Soft Foundation ◽  
Total Settlement ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Consolidation Degree ◽  
Better Than

The soft base in the testing section of Jiang-zhu highwaysis 55 meters deep, and its mechanical property is not better than that of silt soil, the sand-wick drained length is one of the crucial factors for this highwaywhich influences the consolidation speed. Based on the characteristic of soft foundation, experiences and the interrelationship between the processing area and the subjacent bed effecting on draining, the mechanism of extra-long sand-wick for the extra-deep soft foundation is studied. The theoretical consolidation degree in the deep soft foundation treating with extra-long sand-wick drain had been calculated, the designed depth of sand-wick drain were 25 and 22 meters. Moreover, the total settlement will be predicted. According to the monitoring data of displacement and settlement during loading, the characteristic of consolidation settlement of the soft soil foundation had been analyzed. The results indicated that the settlement was very sensitive to the loading speed. The sedimentation became fast with the increasing loading. The sedimentation speed was always very high, which was 15 to 25mm/day on the average. During the prophase of pre-compaction, the consolidation degree of section K53+242.47 (h=25m) was up to 80% in 350 days, which was much faster than the section K53+402.47 (h=22m). Moreover, the soft soil foundation was consolidated stably according to the strict dynamic monitoring data. By using hyperbolic theory to analyze monitoring data, the predictive settlement value of post-project can meet the designed requirement. The treating effect of the 25m depth sand-wick drain was better than that of 22m, which provided available data for extra thick soft foundation treatment.

Experimental Study on Dynamic Consolidation Method to Improve Saturated Soft Soil Foundation

2012 ◽  
Vol 188 ◽  
pp. 45-48
Author(s):  
Guang Qian Du ◽  
Chang Zhi Zhu ◽  
Xi Ping Zhang
Keyword(s):  
Pore Water ◽  
Soft Soil ◽  
Cone Penetration Test ◽  
Dynamic Compaction ◽  
Penetration Test ◽  
Cone Penetration ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Effective Reinforcement ◽  
Static Cone Penetration Test

A new technology of dynamic compaction method is successfully used to reinforce the saturated soft soil foundation. The field monitoring laws of lateral displacement of the foundation after dynamic compaction, the increasing and dissipation regularity of the excess pore water pressure are analyzed and discussed. The improvement effect is verified by static cone penetration test and loading test. The determination methods of effective reinforcement depth after dynamic compaction are put forward. The practice shows that, by field-testing methods, such as static cone penetration test and pore water piezometer test, to determine the effective reinforcement depth after dynamic compaction and other design parameters is reliable.

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