Effects of pile and soil properties on thermally induced mechanical responses of energy piles

Kong, Gangqiang; Fang, Jincheng; Lv, Zhixiang; Yang, Qing

doi:10.1016/j.compgeo.2022.105176

Cited by 62 publications

(4 citation statements)

References 48 publications

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“…Because of the dual role of supporting the superstructure and transferring heat, energy piles in the service process are inevitably subjected to coupled thermomechanical loading. Numerous studies have been conducted to investigate the thermomechanical behavior of single isolated energy piles through full-scale field tests [4][5][6][7][8][9] and laboratory-scale model tests [10][11][12][13][14] . However, information on the thermally induced group actions of energy piles is limited.…”

Section: Introductionmentioning

confidence: 99%

Analytical investigations on thermomechanical behavior of energy pile groups resting on stiff soil strata

Fang,

Feng,

Zhao

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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Energy piles are increasingly being exploited worldwide because of their dual role of exchanging heat with the ground and providing structural support for buildings. Despite the existing studies, simplified but reasonable methods for estimating the vertical displacement of end-bearing energy pile groups subjected to thermal loads are lacking. To address this challenge, an analytical approach was proposed to analyze the thermomechanical behavior of energy pile groups bearing stiff soil strata. To consider the reduction in soil displacement caused by the presence of a bearing layer, an approximate method where the energy piles comprising solid and mirror-image elements was introduced. The proposed approach was implemented using a self-developed program and validated against the results of existing numerical studies. The results indicated that the thermally induced displacement interaction between the predominant end-bearing piles was more pronounced than that between the floating piles. The displacement interaction decreases with decreasing shaft and base soil stiffness, increasing pile spacing, and decreasing pile slenderness ratio. In addition, a simplified method for estimating the displacement of energy pile groups resting on stiff soil strata was established by superimposing the interaction factor.

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Section: Introductionmentioning

confidence: 99%

Analytical investigations on thermomechanical behavior of energy pile groups resting on stiff soil strata

Fang,

Feng,

Zhao

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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“…Soft soil with properties such as high liquidity, high water content, and low permeability often emerged in the process of foundation construction, hence presenting improvement or excavation challenges to the engineers [1][2][3]. Expand cooperation on new energy, energy conservation, and environmental protection has been a hot topic about engineering construction in soft soil foundations [4,5]. In soft soil areas, during the process of foundation pit excavation soil below the excavation surface is subject to obvious vertical unloading, leading inevitably to rebound deformation of soil [6].…”

Section: Introductionmentioning

confidence: 99%

Engineering application of vacuum preloading combined with electroosmosis technique in excavation of soft soil on complex terrain

et al. 2023

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This paper presents the design and construction of vacuum preloading incorporated with electroosmosis (VPE) engineering application for the treatment of soft soil on complex terrain for sluice foundation excavation in order to reduce the amount of cement used in construction. Monitoring was conducted during the VPE treatment and laboratory geotechnical tests were carried out once the treatment came to an end. Results show that the electrification mode has a significant influence on electric energy consumption. Stepped-up voltage helped in saving electric energy while electrode conversion consumed a lot of electric energy. The dispersion of soil parameters became larger after VPE treatment. The stability of physical parameters is better than the mechanical parameters, and the latter is better than the deformation parameters. Soil water content has a linear relationship with density and compression coefficient. The given linear fitting equations can help in simplifying the calculation and acquisition of these indexes. Although the mean values of the soil index parameters slightly improved, their coefficient of variation (COV) significantly increased. These locations with improved index parameters scattering in the construction site ensured that the subsequent construction tasks such as pit slope and excavation were successfully realized in this area.

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“…However, these methods are difficult to deal with the intrinsic model of nonlinear materials [12]. The second method is the mesoscale modeling of the heterogeneous media based on the statistical property of the microstructure [13][14][15][16][17][18][19]. However, the analysis scale of this solution is not big enough for the large-scale geotechnic engineering.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Diversion Tunnel Excavation Using GPU-Accelerated Anisotropic Random Fields

Zhu

Cui

et al. 2023

Geofluids

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In this study, a combined anisotropic random field and GPU-accelerated Cholesky decomposition algorithm is proposed for diversion tunnel excavation. With the MATLAB programming control be used to combine the advantages of GPU and CPU computing, the efficient method of generating large numerical model random fields is realized. Based on the geological structure characteristics of red-layered soft rocks in central Yunnan, the anisotropic rock random field and tunnel excavation with different rotation angles are simulated. The results show that the variability of rotational anisotropy random fields and mechanical parameters of the red-bedded soft rocks in central Yunnan has a large influence on the deformation and stress state of the surrounding rocks at the excavation face of the tunnel. This study can provide theoretical and technical support for the design and construction of relevant rock engineering in the red-layered soft rock area in central Yunnan.

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Effects of pile and soil properties on thermally induced mechanical responses of energy piles

Cited by 62 publications

References 48 publications

Analytical investigations on thermomechanical behavior of energy pile groups resting on stiff soil strata

Analytical investigations on thermomechanical behavior of energy pile groups resting on stiff soil strata

Engineering application of vacuum preloading combined with electroosmosis technique in excavation of soft soil on complex terrain

Numerical Simulation of Diversion Tunnel Excavation Using GPU-Accelerated Anisotropic Random Fields

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