The Settlement Computation of Composite Foundation of Different Typed-Pile Based on the Load Test

2014 ◽  
Vol 490-491 ◽  
pp. 1706-1711
Author(s):  
Man Yuan ◽  
Ji Hui Ding ◽  
Pan Xing Zhang ◽  
Xiao Juan Quan
Keyword(s):  
Deformation Modulus ◽  
Summation Method ◽  
Load Test ◽  
Composite Foundation ◽  
Load Step ◽  
Rigid Pile ◽  
Calculation Results ◽  
Pile Type ◽  
Cement Soil ◽  
Gravel Pile

The three kinds of the typical pile type are selected, which containing flexibility pile (e.g. rammed cement-soil pile is for short RCSP), rigid pile (e.g. cement-flyash-gravel pile is for short CFGP) and loose material pile (e.g. sand-gravel pile is for short SGP). The seven kinds of the composite foundation are designed, which are CFGP, CSP and GP composite foundation, CFG long pile and sand-gravel short pile (for short CFGLP-GSP), CFG long pile and CFG short pile (for short CFGLP-CFGSP), CFG long-short pile and rammed cement-soil short pile (for short CFGLP-RCSP) , and CFG core pile rammed cement-soil loop pile (for short CFGCP-RCSP) combined composite foundation. According to the load-settlement curves to determining the increment deformation modulus of the every load step, the layer-wise summation method to calculate the settlement of composite foundation is given, and the calculation results and the load-settlement curves are consistent.

scholarly journals Numerical and Theoretical Study on the Settlement of Capped Piles Composite Foundation under Embankment

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Ming-Quan Liu ◽  
Da Huang ◽  
Yi-Xiang Song ◽  
Duo-Feng Cen
Keyword(s):  
High Speed ◽  
Soft Soil ◽  
Deformation Modulus ◽  
Compression Modulus ◽  
Calculation Model ◽  
Summation Method ◽  
Load Test ◽  
Composite Foundation ◽  
Static Load Test ◽  
Finite Element Software

Capped piles are efficient in settlement control and have been widely used in the reinforcement of soft soil foundations for high-speed railways and highways. In this study, scenarios involving both capped piles and ordinary piles without caps are numerically studied using the finite element software (ABAQUS). The settlement characteristics of capped piles composite foundation considering the effects of both the pile spacing and the ratio of pile cap to pile diameter are achieved. Based on the numerical results, assuming that the capped pile and the soil under the cap jointly bear load and settle together, a settlement calculation model for capped piles composite foundation is established. By both replacing the compression modulus with the deformation modulus obtained from the field static load test and calculating the area replacement ratio, the formula for calculating the total settlement of the capped piles composite foundation is derived using the layer-wise summation method. In addition, a real embankment engineering with capped piles composite foundation is adopted to validate the accuracy of this method; by comparing with other methods, the results show that this method is in better agreement with the field monitoring data. Therefore, the proposed method is recommended in the relevant engineering design.

Step by Step Calculation and Application of Multi-Type-Pile Composite Foundation

2012 ◽  
Vol 170-173 ◽  
pp. 252-255
Author(s):  
Xiao Hui Mao ◽  
Qiang Yue
Keyword(s):  
Bearing Capacity ◽  
Load Transfer ◽  
Composite Foundation ◽  
Frame Structure ◽  
Single Type ◽  
High Rise ◽  
Construction Methods ◽  
Rigid Pile ◽  
Capacity Improvement ◽  
Gravel Pile

The flexible pile and the rigid pile, the gravel pile and CFG pile are arranged in a group as compound piles, which utilize their merits and avoid their shortcomings. Based on the study of the existing calculation methods for the bearing capacity of multi-pile composite foundation, the working behavior of loaded multi-pile composite foundation and the general influence of different construction methods to the bearing capacity of the soil are considered. The coefficient of the bearing capacity exertion of master piles, the coefficient of the bearing capacity exertion of minor piles, the coefficient of the bearing capacity exertion of the soil between piles and the coefficient of the bearing capacity improvement of the soil are introduced. The new step-by-step calculation method for the bearing capacity of multi-pile composite foundation is put forward. Through designed a high-rise frame structure with multi-type-pile composite foundation, the results show that the multi-type-pile composite foundation is more whole and possess stronger capacity of load transfer compared with single-type-pile composite foundation. It can satisfy the requirements of load bearing capacity and deformation under special foundation conditions.

scholarly journals Effects of Site Factors on the Performance of Rigid-Pile Composite Foundation in Tall Buildings

2014 ◽  
Vol 8 (1) ◽  
pp. 71-77
Author(s):  
Xiao-Lei Han ◽  
Yao-Kun Li ◽  
Jing Ji ◽  
Fan Luo
Keyword(s):  
Great Influence ◽  
Deformation Modulus ◽  
Tall Buildings ◽  
Composite Foundation ◽  
Site Factors ◽  
Fea Model ◽  
Rigid Pile ◽  
Dimension 2 ◽  
Rigid Pile Composite Foundation ◽  
Set Up

Values of site factors in numerical simulation can have profound effects on the calculation accuracy. In order to fully understand the performance of rigid-pile composite foundation in tall buildings, this article set up an overall FEA model of a 25-storey frame-tube structure by considering the interaction of superstructure, foundation and ground. Thereafter, a detailed parametric study was performed by changing values of different key site factors. These parameters include: Ground soil range, distance of neighboring buildings and deformation modulus of cushion. The results show that 1) Ground soil range has a great influence on the stress and settlement of raft, the effective influence range is 2-3 times of the raft dimension; 2) Influence of neighboring buildings on the stress and settlement of the raft can be neglected; 3) With the increase of cushion modulus, the raft stress increases while the settlement decreases, an optimal cushion modulus is recommended to be 20-40MPa.

The Optimization Research on Treatment of the Soft Clay Foundation

2012 ◽  
Vol 152-154 ◽  
pp. 809-815
Author(s):  
Yue Ma ◽  
Jing Cao ◽  
Yu He ◽  
Zai Xi Yu
Keyword(s):  
Stability Analysis ◽  
Treatment Effect ◽  
Yunnan Province ◽  
Treatment Plan ◽  
Soft Clay ◽  
Composite Foundation ◽  
Quantitative Calculation ◽  
Capacity Calculation ◽  
Cement Soil ◽  
Gravel Pile

The article is about the treatment of deep soft clay foundation of the highway project in Yunnan province. Firstly, it analyses the principle and the different features of vertical enhance body composite foundation, including gravel pile, cement soil pile, CFG pile. All kinds of condition should be considered, such as soft clay characteristics, clay mechanics index, the bearing capacity calculation, settlement and stability analysis, to get a treatment plan by using the results of qualitative analysis and quantitative calculation. Then it verifies treatment effect and summarizes characteristics and treatment laws of deep soft clay depending on the detection and construction monitor to guide design and construction.

Research on the Large Size Loading Plate Test of Underwater Sand Compaction Pile Composite Foundation

2015 ◽  
Vol 744-746 ◽  
pp. 574-578
Author(s):  
Jin Fang Hou ◽  
Jian Yu ◽  
Xin Wei Xu
Keyword(s):  
Bearing Capacity ◽  
Stress Ratio ◽  
Soft Soil ◽  
Deformation Modulus ◽  
Load Test ◽  
Composite Foundation ◽  
Plate Test ◽  
Loading Mode ◽  
Large Size ◽  
Soil Stress

Large size loading plate test for sand compaction pile composite foundations with the replacement ratio being up to 60% was carried out to study the deformation and bearing capacity of the sand compaction pile composite foundation. The test was carried out for 53 days with anchor pile, square loading with the side length of 5.4m, 15m-deep water and twice circulation loading mode. The compression deformation, pile-soil stress ratio and deformation modulus of the sand compaction pile composite foundation was analyzed through load test. Test results indicated that, the ultimate bearing capacity of the sand compaction pile composite foundation in this test was larger than 340kPa; sand compaction pile had a drainage consolidation effect on the soft soil between piles; under the load-keeping condition, sand compaction pile composite foundation would also has settlement; pile-soil stress ratio was 6.3 and deformation modulus was about 8kPa. The success of the test may provide experience and reference for load test of underwater sand compaction pile composite foundation carried out at open sea.

Character Analysis of Balance and Imbalance of Varying Rigidity of Rigid Pile Composite Foundation under Seismic Load

2014 ◽  
Vol 1065-1069 ◽  
pp. 19-22
Author(s):  
Zhen Feng Wang ◽  
Ke Sheng Ma
Keyword(s):  
Finite Element ◽  
Bending Moment ◽  
Horizontal Displacement ◽  
Element Model ◽  
Composite Foundation ◽  
Seismic Load ◽  
Seismic Loads ◽  
Element Analysis ◽  
Rigid Pile ◽  
Rigid Pile Composite Foundation

Based on ABAQUS finite element analysis software simulation, the finite element model for dynamic analysis of rigid pile composite foundation and superstructure interaction system is established, which selects the two kinds of models, by simulating the soil dynamic constitutive model, selecting appropriate artificial boundary.The influence of rigid pile composite foundation on balance and imbalance of varying rigidity is analyzed under seismic loads. The result shows that the maximum bending moment and the horizontal displacement of the long pile is much greater than that of the short pile under seismic loads, the long pile of bending moment is larger in the position of stiffness change. By constrast, under the same economic condition, the aseismic performance of of rigid pile composite foundation on balance of varying rigidity is better than that of rigid pile composite foundation on imbalance of varying rigidity.

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.

The Settlement Analysis of the Cement Fly-Ash Gravel Pile Composite Foundation of Baotou

2014 ◽  
Vol 580-583 ◽  
pp. 518-523
Author(s):  
Juan Li ◽  
Yao Xu ◽  
Jun Yin
Keyword(s):  
Fly Ash ◽  
Composite Foundation ◽  
Settlement Calculation ◽  
Practical Engineering ◽  
Cfg Pile Composite Foundation ◽  
Modified Formula ◽  
Gravel Pile ◽  
Final Settlement ◽  
Settlement Analysis ◽  
Cfg Pile

This paper analyzes the causes of larger differences of final settlement calculated value of cement fly-ash gravel pile (CFG pile) composite foundation of Baotou with actual observed result of it. On the basis of analysis on a number of practical engineering data of Baotou, we modify the settlement formula of the CFG pile composite foundation and gain the modified coefficient applied to the settlement calculation of the CFG pile composite foundation of Baotou. The modified formula and coefficient proposed in this paper have a positive effect on the accurate settlement calculation of puting forward a more accurate correction formula and coefficient of the calculation of the CFG pile composite foundation of Baotou.

Effect of Solidification Mechanism of Nanometer Ore Powder Cement Soil on the Late Formation of Composite Foundation

2021 ◽  
Vol 219 (1) ◽  
pp. 189-203
Author(s):  
Yanyan Cai ◽  
Zehan Liu ◽  
Jin Yu ◽  
Wei Yao ◽  
Xueying Liu
Keyword(s):  
Composite Foundation ◽  
Cement Soil ◽  
Solidification Mechanism

Time Effects on Settlement of Rigid Pile Composite Foundation: Simplified Models

2018 ◽  
Vol 15 (07) ◽  
pp. 1850066 ◽  
Author(s):  
Meijuan Xu ◽  
Pengpeng Ni ◽  
Guoxiong Mei ◽  
Yanlin Zhao
Keyword(s):  
Numerical Integration ◽  
Half Space ◽  
Unsaturated Soils ◽  
Pressure Coefficient ◽  
Closed Form Solution ◽  
Elastic Half Space ◽  
Composite Foundation ◽  
Model Parameters ◽  
Time Effects ◽  
Rigid Pile

The behavior of pile composite foundation is studied using the flexibility method. During the analysis, determination of the flexibility matrix (settlement) is critical. However, conventional methods of Winkler and elastic half-space foundation models are incapable of considering the time effects of soil consolidation and creep. The foundation model of Zaretsky and Tsytovich [1965] can be used to evaluate settlement for unsaturated soils, but the complexity of numerical integration over an arbitrary loading area hinders its application. In this paper, a novel scheme is proposed for numerical integration by rotating the loading surface using the equiareal transformation technique. Therefore, a simplified closed-form solution is developed to calculate time dependent settlement for foundation soils. The efficacy of the proposed technique is demonstrated using illustrative examples of an elastic half-space, a rigid raft foundation without piles, and rigid pile composite foundations with multiple piles under surface loading. Furthermore, parametric study is conducted to evaluate the sensitivity of model parameters. The permeability [Formula: see text] and Poisson’s ratio [Formula: see text] are found to be important, whereas pore pressure coefficient [Formula: see text] and degree of saturation [Formula: see text] are less significant in the calculation.

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