scholarly journals Reliability Design of Soft Soil Foundation Preloading Method for Airport Runway

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Qingkun Yu ◽  
Liangcai Cai ◽  
Xiang Shi
Keyword(s):  
Treatment Plan ◽  
Soft Soil ◽  
Soil Layer ◽  
Probability Of Failure ◽  
Soil Parameters ◽  
Reliability Calculation ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Airport Runway ◽  
Preloading Method

Focusing on the rapid assessment of the reliability of airport runway soft soil foundation, taking the soft soil foundation preloading method as the research object, we established the corresponding settlement calculation model and studied the soil parameters and how they affect the settlement values, and the reliability of the soft soil foundation preloading method was obtained by the checking point method (JC). In order to realize the fast calculation of reliability, Visual Studio 2010 is used to design the visual reliability calculation program of the airport runway soft soil foundation preloading method. The analysis results showed that the soil index with the greatest influence on the final consolidation settlement was the compression coefficient, followed by the soil layer thickness, the compression modulus, the void ratio, and the consolidation coefficient. On the basis of the limit state equation, we got the final failure probability formula. Combined with an airport project example, the reliability calculation results showed that the longer the preloading time was, the more reliable the treatment plan was, and the less the probability of failure was; the larger the preloading pressure was, the more reliable the treatment plan was, and the less the probability of failure was. In the engineering example, it can be found that the treatment plan with the preloading of 100 kPa and the stacking time of 150 days is the best solution.

Study of “Wave Type” Uneven Settlement and Reinforcing Method of Soft Clay Foundation

2011 ◽  
Vol 243-249 ◽  
pp. 2990-2996
Author(s):  
Li Qiang Sun ◽  
Shu Wang Yan ◽  
Hong Juan He ◽  
Yu Xu
Keyword(s):  
Soft Soil ◽  
Soft Clay ◽  
Traffic Load ◽  
Dominant Factor ◽  
Wave Type ◽  
The Road ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Preloading Method

The deformation is the dominant factor of the quality of the road constructed on the soft soil foundation. Tianjin DongJiang port is located on the hydraulic filled soil foundation which is improved by using vacuum preloading method. Roads in this area often suffer wave type asymmetry settlement, which serious affects the usage of the road and causes damage to both vehicles and human being. It is found that the initial wave asymmetry deformation of the road on very soft soil foundation usually exists and will be developing continuously under the traffic load. The mechanism of the wavy failure of the road is discussed by establishing a mechanical model. The method of using geogrids to reduce the asymmetry deformation is proposed, the reinforce effect is analyzed using finite element method.

scholarly journals Development of an Artificial Intelligence Approach for Prediction of Consolidation Coefficient of Soft Soil: A Sensitivity Analysis

2019 ◽  
Vol 13 (1) ◽  
pp. 178-188 ◽  
Author(s):  
Manh Duc Nguyen ◽  
Binh Thai Pham ◽  
Tran Thi Tuyen ◽  
Hoang Phan Hai Yen ◽  
Indra Prakash ◽  
...  
Keyword(s):  
Artificial Intelligence ◽  
Soft Soil ◽  
Clay Content ◽  
Liquid Limit ◽  
Soil Parameters ◽  
Consolidation Coefficient ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Intelligence Approach ◽  
Artificial Intelligence Approach

Background: Consolidation coefficient (Cv) is a key parameter to forecast consolidation settlement of soft soil foundation as well as in treatment design of soft soil foundation, especially when drainage consolidation is used in foundation treatment of soft soil. Objective: In this study, the main objective is to predict accurately the consolidation coefficient (Cv) of soft soil using an artificial intelligence approach named Random Forest (RF) method. In addition, we have analyzed the sensitivity of different combinations of factors for prediction of the Cv. Method: A total of 163 soil samples were collected from the construction site in Vietnam. These samples at various depth (m) were analyzed in the laboratory for the determination of clay content (%), moisture content (%), liquid limit (%), plastic limit (%), plasticity index (%), liquidity index (%), and the Cv for generating datasets for modeling. Performance of the models was validated using Mean Absolute Error (MAE), Root Mean Square Error (RMSE) and Correlation Coefficient (R) methods. In the present study, various combinations of soil parameters were applied and eight models were developed using RF algorithm for predicting the Cv of soft soil. Results: Results of model’s study show that performance of the models using different combinations of input factors is much different where R value varies from 0.715 to 0.822. Conclusion: Present study suggested that RF model with appropriate combination of soil properties input factors can help in better and accurate prediction of the Cv of soft soil.

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.

The Responses of Soft Ground Materials Subjected to Dynamic Loading

2012 ◽  
Vol 591-593 ◽  
pp. 977-981
Author(s):  
Jun He ◽  
Bing Bai ◽  
Quan Fei Chen
Keyword(s):  
Pore Pressure ◽  
Dynamic Loading ◽  
Soft Soil ◽  
Soil Layer ◽  
Ground Surface ◽  
Vertical Displacement ◽  
Dynamic Compaction ◽  
Soft Ground ◽  
Soil Foundation ◽  
Soft Soil Foundation

The responses of saturated soft soil foundation under dynamic loading are analyzed using numerical method. The distributions of pore pressure in space are given, and the variations of pore pressure with time are also discussed. Besides, the distributions of vertical stresses and vertical displacement are also given. Studies show that during the period of dynamic loading, the pore pressure and stress in soil layer grows very fast, and also decreases rapidly in the unloading phase. With the increase of dynamic compaction time, the locations of the maximum values gradually move down. Moreover, the pore pressure and stress gradually decreases with the increase of the distance away from hammer point. On the other hand, the tamping pit in ground surface under dynamic loading has a larger settlement, and furthermore decreases with the increase of depth.

Character of the Lateral Displacement of Soft Soil Foundation under Embankment

2011 ◽  
Vol 197-198 ◽  
pp. 987-991
Author(s):  
Jie Qun Liu ◽  
Jin Long Liu
Keyword(s):  
Finite Element Method ◽  
Lateral Displacement ◽  
Soft Soil ◽  
Soil Layer ◽  
Measuring Method ◽  
Vertical Surface ◽  
Nonlinear Finite Element ◽  
Nonlinear Finite Element Method ◽  
Soil Foundation ◽  
Soft Soil Foundation

In order to analyze the characteristic of lateral displacement of soft soil foundation under embankment, a typical embankment is studied systemically with nonlinear finite element method, and the location of maximal lateral displacement and its measuring method is also discussed. It is pointed that lateral displacement would be reduced possibly at consolidation stage with strong dry crust and thick soft soil layer, which happened synchronously with vertical settlement increased rapidly. This phenomena could not be measured conveniently with inclinometer pipe, for there are many shortcomings within this technique, although which has been used in engineering widely. It is also shown that the location of the maximal lateral displacement is changeable at different construction stages, which more likely lies in the vertical surface between the toe and the middle of slope of embankment. In order to get the maximal lateral displacement reasonably, it is suggested that the inclinometer pipes should be placed in that area of embankment.

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.

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.

Research of Calculation Method for Final Soft Clay Ground Settlement by Preloading Method

2014 ◽  
Vol 1065-1069 ◽  
pp. 164-167
Author(s):  
Da Gang Wang ◽  
Zhong Qiu Xie ◽  
Xi Liu ◽  
Jun Cao
Keyword(s):  
Large Scale ◽  
Soft Soil ◽  
Measured Data ◽  
Exponential Curve ◽  
Curve Method ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Preloading Method ◽  
Ultimate Settlement ◽  
Hyperbolic Method

Preloading method is a common way to dispose large-scale soft soil foundation, and its methods of calculating the settlement amount mainly include exponential curve method, hyperbolic method, and Asaoka method. This paper chose exponential curve method and hyperbolic method to conduct ultimate settlement calculation on some reclamation project of Yingkou Port against measured data of settlement in the project, and compared the result to that calculated by splitting summation method. The accuracy was also verified by measured data of settlement amount in later phase to reach the conclusion that hyperbolic method is more suitable for calculating the ultimate settlement amount considering the soft soil foundation of marine facies in Liaoning.

scholarly journals Study of Construction Techniques of Highways and Bridges on Soft Soil Foundation

2015 ◽  
Vol 2 ◽  
pp. 39
Author(s):  
Hainan Zheng
Keyword(s):  
Soft Soil ◽  
Soil Layer ◽  
Foundation Construction ◽  
Safety Issues ◽  
Construction Techniques ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
The Cost

<p>The quality of highways and bridges’ foundation construction influences the overall quality of the projects directly. The soft soil layer shall be investigated in advance during construction in order to analyse and identify the specific reinforcement and processing approaches. The cost, processed effects and safety issues shall be considered prior to reinforcement. Different reinforcement approaches can be used in order to save the cost and ensure the quality of soft soil foundation reinforcement. This paper discusses the preparation of soft soil foundation construction and the technology involved in the construction of highways and bridges on soft soil foundation. It is expected that the study could provide some references to professionals.  </p>

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