Study on thermo-mechanical response characteristics of horizontally loaded energy piles in saturated clay
The researches on the thermo-mechanical response of energy piles primarily focus on vertical loads,with limited studies considering the influence of horizontal loads.To investigate the thermo-mechanical response characteristics of energy piles subjected to horizontal loads,a model-scale test was conducted to analyze the variations in pile top displacement,pile bending moment,pore water pressure and soil pressure in front of the pile in saturated clay under different temperature gradients.The research results showed that both heating and cooling of the pile induced additional pile top displacement.Cooling caused a greater additional displacement,reaching 0.22％D(D is the diameter of the pile),while heating induced an additional displacement of 0.13％D.The ultimate bearing capacity of the pile increased after heating/cooling compared to the test pile.The increase was more observed after heating,approximately 32.7％,whereas it was about 26.1％after cooling.This was due to the thermal consolidation effect during heating significantly enhanced the strength of the soil.Heating and cooling did not have a significant impact on the location of the maximum bending moment,as the maximum bending moment consistently occurred at a depth of 37.5％L(L is the burial length of the pile)before and after heating/cooling.The maximum bending moment increased after heating/cooling.During cooling,the maximum bending moment initially increased and then stabilized gradually.During heating,the maximum bending moment initially decreased and then gradually increased,exceeding the bending moment before heating.During this period,the pile top displacement continued to increase,suggesting the possibility of rigid rotation of the pile in the initial stage of heating.Heating and cooling had different effects on the soil pressure in front of the pile.Overall,the upper part of the soil pressure generally increased,while the lower part decreased.Heating and cooling caused variations in pore water pressure in the soil with changing temperatures,resulting in positive or negative excess pore water pressure.
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