Effects of Soil Type on Axial and Radial Thermal Responses of Field-Scale Energy Piles

Lv, Zhixiang; Kong, Gangqiang; Liu, Hanlong; Ng, Charles Wang Wai

doi:10.1061/(asce)gt.1943-5606.0002367

Cited by 18 publications

(2 citation statements)

References 36 publications

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“…Observations are made at the radial zone (R1) or 15 cm from the thermal point as shown in Figure 3 which has a significant impact on the thermal effect. This observation is in the form of physical, chemical, and mechanical changes of the test sample [14,15]. Physical test is carried out through of a property test which includes specific gravity, grade, water, Atterberg limit.…”

Section: Model Test Proceduresmentioning

confidence: 99%

Preloading Model on Soft Soil with Inclusion Thermal Induction Vertical and Incline Types

et al. 2021

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Soft clay has a relatively low subgrade bearing capacity. The aim is to obtain physical values, mineralogy, mechanical strength values, values for reduction. The research method used is preloading in a test tube measuring 50×70×150 cm. Each cycle of preloading and thermal induction used a fixed load of 0.015 kg/cm². Thermal induction is given vertically and obliquely with temperature variations of 100, 200, 300, and 400 °C. The main observation point is a distance of 15 cm from the center of the induction. At 400 °C inclined induction, the water content is 17.36% (from the initial water content of 59.07%), the soil cohesion is 21.75. kN/m², the value of unconfined compressive strength is 67.72 kN/m², the highest modulus of elasticity is 4593 kN/m2, and the decrease is 5.13 cm. XRD, SEM, EDS results before heating showed mineralogy 0 (65.06%), Ca (13.30%), Na (3.64%), Mg (2.15%), Al (6.63%), Si (8.52%), Sn (0.70%) and did not change significantly after heating at 400 °C. The results after heating included 0 (58.39%), Ca (14.09%), Na (0.72%), Mg (1.16%), Al (6.63%), Si (14.72%), Sn (2.54%). The novelty obtained is to change very soft conditions became medium conditions. Doi: 10.28991/cej-2021-03091705 Full Text: PDF

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Section: Model Test Proceduresmentioning

confidence: 99%

Preloading Model on Soft Soil with Inclusion Thermal Induction Vertical and Incline Types

et al. 2021

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“…By monitoring the variation in pile temperature, pile stress, and raft stress, they found certain tensile stress on the upper edge of the raft during heating of the energy piles without load constraint. Lv et al [8] conducted field tests on the axial and radial thermal responses of friction-type energy piles in clay. They monitored the thermodynamic parameters, such as inlet and outlet temperature, pile temperature, and strain, and compared the friction-type energy piles in dense sand.…”

Section: Introductionmentioning

confidence: 99%

Study on the thermal response of spiral energy piles based on field test

et al. 2023

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Field tests of spiral energy piles under the combined effect of temperature and loading are relatively few. Based on the field test, the heat transfer efficiency, pile strain, axial force and shaft friction of two spiral energy piles were studied. The major findings of the experimental studies were as follows: First, when the double spiral energy pile was heated, the temperature distribution was more uniform; the total heat transfer and the heat transfer rate were higher than those of the single spiral energy pile. Second, the pile strain distribution was such that smaller values were noticed at both pile ends while larger values were in the middle part of the pile. The additional tensile stresses of the two piles generated during cooling reached 4.06 MPa and 4.75 MPa, which exceeded the tensile strength of concrete. Finally, during heating, the shaft friction was negative in the middle and upper pile and positive in the middle and lower pile. The single spiral energy pile showed two neutral points. The downward load generated by the single spiral energy pile was about 885 kN higher than that generated by the double one. The above changes should be focused on in the actual project.

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Effect of Soil State on Load–Displacement of Thermal Piles

Saggu

Chakraborty

2023

Indian Geotech J

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Effects of Soil Type on Axial and Radial Thermal Responses of Field-Scale Energy Piles

Cited by 18 publications

References 36 publications

Preloading Model on Soft Soil with Inclusion Thermal Induction Vertical and Incline Types

Preloading Model on Soft Soil with Inclusion Thermal Induction Vertical and Incline Types

Study on the thermal response of spiral energy piles based on field test

Effect of Soil State on Load–Displacement of Thermal Piles

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