Analytical Method for Prediction of Progressive Deformation Mechanism of Existing Piles Due to Excavation Beneath a Pile-Supported Building

Zhang, Qian‐qing; Liu, Shan-wei; Feng, Ruo-feng; Li, Xiao-mi

doi:10.1007/s40999-018-0309-9

Cited by 33 publications

(13 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where ( ) is the shaft shear stress at a given depth z, is the initial stiffness of the soil surrounding pile shaft, Δ is the pile-soil relative displacement developed in the pile-soil interface at a given depth z. is the pile end resistance, is initial soil stiffness at the pile base, and is the pile end settlements. The coefficients and can be obtained by the proposed method in the references [1][2][3]27]. As discussed above, it can be seen that there was a zero point of displacement change at which the additional displacement caused by temperature was zero, while the pile top load was not heavier than the value, , that leading to nonlinear settlement of pile top, as shown in Figures 6 and 7.…”

Section: Analysis Of Pile Under Thermomechanical Loadmentioning

confidence: 99%

“…Over the past decades, many experimental and theoretical researches have been carried out to analyze the bearing characteristics of pile foundations, because of their extensive application in many infrastructures and structures [1][2][3]. In recent years, pile foundations have been increasingly used in an innovative form of energy piles, which couples the structural role of pile foundations to that of heat exchangers to exploit the large thermal storage capabilities of the ground, particularly when these energy piles are coupled to heat pumps [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

FEM Analysis and Simplified Approach for a Single Energy Pile Subjected to Thermomechanical Loads

Wang

Fang

Zhang³

et al. 2019

Mathematical Problems in Engineering

View full text Add to dashboard Cite

The distribution of temperature in sand soils was measured through laboratory tests, and the temperature influence on friction resistances at the concrete-soil interface was analyzed. Based on the results of laboratory tests, the finite element model was established using the sequential thermal coupling method. The influences of temperature on the bearing characteristics of energy pile were analyzed. The analysis results show that the cyclic temperature will cause additional displacement along pile depth. It is pointed out that if applied vertical loads at energy pile head exceed the value from which nonlinear settlements would be initiated, irrecoverable additional settlement will occur at pile head. Based on the analysis results, a simplified approach was proposed to estimate the zero point of additional displacement along pile shaft and the additional axial pile force. The comparison between the calculated results obtained by the proposed method and that of ABAQUS on single energy pile was given to verify the accuracy of the proposed method. It is shown that reasonable predictions can be obtained without expensive and time-consuming analyses by the proposed method in this paper.

show abstract

Section: Analysis Of Pile Under Thermomechanical Loadmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

FEM Analysis and Simplified Approach for a Single Energy Pile Subjected to Thermomechanical Loads

Wang

Fang

Zhang³

et al. 2019

Mathematical Problems in Engineering

View full text Add to dashboard Cite

show abstract

“…In past decades, many methods have been used to calculate the settlement of piles, such as the theoretical loadtransfer method [14][15][16], the elastic theory method [17,18], the shearing deformation method [19], numerical computation methods [20][21][22][23][24][25], and the layer-wise summation method [26]. Some scholars have investigated the adaptability of the postgrouting technique in different bearing strata and the factors influencing the settlement and deformation [9,27].…”

Section: Introductionmentioning

confidence: 99%

Optimization Analysis of Settlement Parameters for Postgrouting Piles in Loess Area of Shaanxi, China

Zhou

Zhu

Kong

et al. 2019

Advances in Civil Engineering

View full text Add to dashboard Cite

The settlement calculation of postgrouting piles is complex and depends on the calculation method and parameters. Static load tests were conducted to compare the settlement characteristics of nongrouting and postgrouting piles, and three vital parameters in the layer-wise summation method were revised to predict the settlement of postgrouting piles. The elastic compression coefficient was deduced based on the Mindlin–Geddes method by considering the influence of the change in the pile side resistance distribution and end resistance ratio on the elastic compression after grouting. The relationship between the compression modulus and soil gravity stress and cone penetration resistance were established, respectively, using experimental data. The optimum value of the settlement empirical coefficient was determined using regional data. Finally, we used the postgrouting pile of the Wuqi–Dingbian expressway as a practical example. The results obtained from the layer-wise summation method after parametric optimization were close to the measured values. The results of this study provide reference data and guidance for the settlement calculation of postgrouting piles in this area.

show abstract

“…e displacement-induced skin friction and tip resistance to existing piles located near the excavation area are always calculated using hyperbolic models [9][10][11][12][13] or nonlinear models [14][15][16][17]. Multiple new methodologies have been proposed to estimate or predict the responses of existing piles to new excavations via theoretical and numerical simulations [18][19][20][21][22][23]. is paper presents a methodology to predict the responses of existing floating piles to adjacent deep excavation in soft clay.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Response of Existing Building Piles to Adjacent Deep Excavation in Soft Clay

Liang

Liu

et al. 2019

Advances in Civil Engineering

View full text Add to dashboard Cite

This study investigates building settlements near excavations in soft clay. A simplified theoretical method is proposed to predict the additional settlements and axial forces of excavation-adjacent existing building floating piles in soft clay. The soil displacement is simplified as a line or broken line along the depth direction, depending on the distance from the excavation. A hyperbolic model is applied to calculate the skin friction and tip resistance induced by the vertical soil displacement. The parameters of the hyperbolic model are corrected to fit data from in-service piles. Based on the load-transfer curve method, the additional settlements and axial forces are determined. The measured data of 17 floating piles from two excavation cases in Hangzhou, China, show good agreement with the calculated values. The results show that the position of the neutral point of the loaded pile varies with the soil settlement. Because of the upper structure, the theoretical settlements for piles near the excavation are larger than those obtained from the measured values; for distant piles, this relationship is reversed. The proposed prediction methodology is expected to guide the design of practical excavations.

show abstract

Analytical Method for Prediction of Progressive Deformation Mechanism of Existing Piles Due to Excavation Beneath a Pile-Supported Building

Cited by 33 publications

References 32 publications

FEM Analysis and Simplified Approach for a Single Energy Pile Subjected to Thermomechanical Loads

FEM Analysis and Simplified Approach for a Single Energy Pile Subjected to Thermomechanical Loads

Optimization Analysis of Settlement Parameters for Postgrouting Piles in Loess Area of Shaanxi, China

Prediction of Response of Existing Building Piles to Adjacent Deep Excavation in Soft Clay

Contact Info

Product

Resources

About