The Numerical Analysis of CFG Pile Technology in the Disposing Soft Foundation in GuangWu Expressway

2011 ◽  
Vol 90-93 ◽  
pp. 2096-2100
Author(s):  
Yun Mei Meng ◽  
Yun Cao
Keyword(s):  
Numerical Analysis ◽  
Soft Soil ◽  
Influence Factors ◽  
Computational Results ◽  
Soft Foundation ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Cfg Pile

The problem of disposing the soft soil foundation will appear inevitably during the construction of modem high way. There are many ways to dispose the soft foundation. One of those is CFG pile technology. Take the CFG pile technology in the GuangWu Expressway for example, the influence factors of embankment settlement were discussed in detai by numerical analysis, some useful conclusions are obtained from the computational results.

Application and Research on New Technology of Foam Lightweight Soil in Treatment of Soft Soil Foundation of Railway Engineering

2012 ◽  
Vol 204-208 ◽  
pp. 1622-1625 ◽  
Author(s):  
Zi Lin Li ◽  
Kai Feng Zhang
Keyword(s):  
New Technology ◽  
Soft Soil ◽  
Actual Application ◽  
Foundation Treatment ◽  
Soft Foundation ◽  
Depth Analysis ◽  
Depth Study ◽  
New Ideas ◽  
Soil Foundation ◽  
Soft Soil Foundation

Foam lightweight soil is a new type of material appearing in recent years, whose advantages are paid more and more attention to by engineers and it will have broad application prospect in the engineering. An in-depth study application of foam lightweight soil in the complex of railway soft soil foundation treatment what based on a railway foundation project in Tianjin, this paper discusses the actual application state of foam lightweight soil in handling of special railway soft soil foundation. Through in-depth analysis of the advantages of a foam lightweight soil, optimization of construction replacement thickness and moisture density, discussion on construction of it, we can find large advantages of foam lightweight soil as replacement material in the complex railway soft soil foundation treatment, and provide new ideas about processing complex soft foundation.

The Effect Analysis of the Thin-Walled Tubular Pile Technology Used in the Foundation Treatment of the High-Filling Railway Freight Yard

2014 ◽  
Vol 919-921 ◽  
pp. 1184-1190
Author(s):  
Jie Yu ◽  
Tian Yue Chu ◽  
Quan Mei Gong
Keyword(s):  
Soft Soil ◽  
Measured Data ◽  
Effect Analysis ◽  
Railway Freight ◽  
Foundation Treatment ◽  
Soft Foundation ◽  
Thin Walled ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Soft Subgrade

On the background of one railway freight yard in Xiao Yong railway , and firstly the use of thin-walled tubular pile is determined in railroad yard through the comparison with other methods in the soft foundation reinforcement. Secondly, the effect of the soft-soil foundation reinforcement combined with the numerical simulation and the measured data is analyzed. Finally, it is defined that the thin-walled tubular piles has good value in the treatment of the high-filling railway yard, and it also can provide a new method for the improvement of the soft subgrade in railway freight yard.

The Application of Anchor Block in Large Soft Foundation Pit Excavation

2012 ◽  
Vol 170-173 ◽  
pp. 520-524
Author(s):  
Chi Ma ◽  
Guo Nan Liu ◽  
Yue Ying Liang
Keyword(s):  
Soft Soil ◽  
Rail Transport ◽  
Foundation Engineering ◽  
Foundation Pit ◽  
Soft Foundation ◽  
New Ideas ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Improved Design ◽  
Anchor Block

Based on pit excavation of Shenzhen Airport Rail transport hub project, combined with anchorage stress characteristics, difficulties was studied and numerical calculation for the envelope structure was undertaken. The successful application of design provides new ideas, improved design methods for super soft soil foundation engineering, which can greatly promote the application and development of anchor block in soft foundation excavation.

Application of Vacuum Preloading for Soft Foundation Treatment in Grain Storage

2012 ◽  
Vol 190-191 ◽  
pp. 1207-1213
Author(s):  
Qi Xia Liu ◽  
Yang Zhao
Keyword(s):  
Soft Soil ◽  
Construction Method ◽  
Grain Storage ◽  
Vacuum Preloading ◽  
Obvious Effect ◽  
Foundation Construction ◽  
Foundation Treatment ◽  
Soft Foundation ◽  
Soil Foundation ◽  
Soft Soil Foundation

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 east coast of China is the most developed economical area and major grain and oil manufacturers. Many grain and oil depots have been established. However, in the places where the depots located, soil is soft dirt with low strength grade, high compressibility, small permeability and high possibility of plastic flow, has increased difficulties of grain and oil depots foundation construction. Without enough knowledge of soft soil and lacking of proper foundation construction method and good technology, depots may slip due to foundation’s erosion, and big settlement. If the structure slips, equipments for aeration, dehumidifier, antivirus equipment cannot work well. Based on the statement above, reasonable and effective methods for soft soil foundation work is the key point for construction of high quality and high standard grain and oil depots. This paper mainly discussed when we do depots construction work on the soft soil foundation, exact calculation, construction method and result test of fasten method for the soft foundation under the vacuum circumstance of preloading.

Numerical Simulation on Spallation and Failure of Driven Pile

2013 ◽  
Vol 791-793 ◽  
pp. 1377-1380
Author(s):  
Yong Xiang Zhu ◽  
Guan Jun Liang ◽  
Chao You ◽  
Xun Zhong Zhang
Keyword(s):  
Numerical Simulation ◽  
Stress Wave ◽  
Soft Soil ◽  
Influence Factors ◽  
Wave Theory ◽  
Nonlinear Program ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Driven Pile

The present paper analyzes the phenomenon on spallation and failure of driven pile. Based on the nonlinear program LS-DYNA, the dynamical performance of driven pile into the soft soil foundation is studied by numerical simulation. Taking into account the stress-wave theory, some analyses are conducted to discuss the influence factors on spallation and failure of driven pile. The analysis results show that the compression and tension of stress wave plays an important role in the process of pile driven. Some guidance and reference is useful for the design, manufacturing and construction of piles.

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.

Research on Settlement Calculation of Soft Foundation Treated with Vacuum Preloading Based on Stress Path Method

2011 ◽  
Vol 243-249 ◽  
pp. 2864-2868
Author(s):  
Yue Dong Wu ◽  
Shang Chuan Yang ◽  
Han Long Liu
Keyword(s):  
Soft Soil ◽  
Confining Pressure ◽  
Stress Path ◽  
Soil Mass ◽  
Positive Pressure ◽  
Vacuum Preloading ◽  
Surcharge Preloading ◽  
Soft Foundation ◽  
Soil Foundation ◽  
Soft Soil Foundation

Stress state of soft soil foundation under vacuum preloading is completely different from its counterpart under surcharge preloading, and the method of calculating the final settlement of soil mass by means of surcharge preloading (positive pressure) is unreasonable in present design. According to a case of soft foundation stabilized with vacuum preloading and through consolidated-undrained triaxial (CU) test on the specimens sampled in situ, the stress paths under different confining pressure are obtained. The settlement of soft foundation treated with vacuum preloading is calculated by strain isoline method. Compared with the practically measured field data, the errors are analyzed and discussed.

scholarly journals Influences of Urban Viaduct Pier Caps on Uneven Settlement of Roadbed

2019 ◽  
Vol 2019 ◽  
pp. 1-20
Author(s):  
Bin Hu ◽  
Xiaoqing Li ◽  
Lifei Zheng
Keyword(s):  
Numerical Analysis ◽  
Soft Soil ◽  
Construction Cost ◽  
Construction Technology ◽  
Analysis Model ◽  
Relative Stiffness ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Pier Caps

Uneven settlement widely occurs on the roadbed under urban viaducts in operation. Previous studies focused on the effect of soft soil foundation on the uneven settlement of roadbed, without considering the phenomenon and mechanism of uneven settlement at the junction of pier cap and the roadbed under viaduct. The interaction is now considered between the buried depth of cap, the relative stiffness between cap and road subgrade, and the uneven settlement of roadbed. Using the Midas GTS NX software, a numerical analysis model of the deformation of roadbed under viaduct is constructed to study the influence of viaduct cap foundation on the uneven settlement of roadbed under viaduct. The simulated results of uneven settlement of roadbed caused by urban viaduct pier cap show that (1) when the buried depth of cap exceeds 2.35 m, with the increase of buried depth, the fall of roadbed settlement tends to decrease, but the decreased amount is not significant. Considering the factors such as construction cost and complications of construction technology, it is suggested that the best buried depth of cap is about 2.5 m. (2) The fall of roadbed settlement decreases with the decrease of relative stiffness between cap and roadbed. When the relative stiffness exceeds 6.3, the decreasing trend of settlement fall is not significant. The concrete roadbed should have more stiffness in order to reduce the settlement.

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.

scholarly journals Application of the WNN-Based SCG Optimization Algorithm for Predicting Soft Soil Foundation Engineering Settlement

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Guihua Li ◽  
Chenyu Han ◽  
Hong Mei ◽  
Shuai Chen
Keyword(s):  
Neural Network ◽  
Soft Soil ◽  
Wavelet Neural Network ◽  
Foundation Engineering ◽  
Settlement Prediction ◽  
Training Techniques ◽  
Soft Foundation ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Hidden Layer

Settlement prediction in soft soil foundation engineering is a newer technique. Predicting soft soil settling has long been one of the most challenging techniques due to difficulties in soft soil engineering. To overcome these challenges, the wavelet neural network (WNN) is mostly used. So, after assessing its estimate performance, two elements, early parameter selection and system training techniques, are chosen to optimize the traditional WNN difficulties of readily convergence to the local infinitesimal point, low speed, and poor approximation performance. The number of hidden layer nodes is determined using a self-adaptive adjustment technique. The wavelet neural network (WNN) is coupled with the scaled conjugate gradient (SCG) to increase the feasibility and accuracy of the soft fundamental engineering settlement prediction model, and a better wavelet network for the soft ground engineering settlement prediction is suggested in this paper. Furthermore, we have proposed the technique of locating the early parameters based on autocorrelation. The settlement of three types of traditional soft foundation engineering, including metro tunnels, highways, and high-rise building foundations, has been predicted using our proposed model. The findings revealed that the model is superior to the backpropagation neural network and the standard WNN for solving problems of approximation performance. As a result, the model is acceptable for soft foundation engineering settlement prediction and has substantial project referential value.

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