Numerical Simulation Study On Mixing Ratio Test And Heat Storage Of Energy Pile Concrete

With the development of science and technology the progress of the times,energy resources are consumed at a high level and utilization efficiency is low.However,the awareness of maximizing resource conservation,environmental protection,pollution reduction,and symbiosis with nature has gradually increased,and more and more energy-saving technologies have also been born.Ground-source heat pump technology is a new form of underground shallow energy,which has the advantage of using renewable energy.When a pile foundation and a ground source heat pump are used in a building,the use of an energy pile to replace a part of the borehole heat exchange has gradually become a trend.The concrete energy pile technology is to buy the heat exchange tube into the pile foundation and connect it with the ground source heat pump system to exchange heat with the surrounding soil.In engineering,the construction period can be shortened and the cost can be reduced.In this paper,the combination of experimental research and numerical simulation is used to systematically study the concrete energy pile.Since the concrete energy pile technology utilizes the pile foundation part,in order to ensure that the concrete energy pile has good thermal conductivity,the mechanical properties of the concrete energy pile are also ensured.In this paper,the original mix ratio of ordinary C30 concrete is determined according to the known conditions and specifications,and relevant mechanical verification is carried out.From the perspective of changing the mixing ratio to improve the thermal conductivity of concrete,the optimal mix ratio of high thermal conductivity of concrete was obtained through experimental data.Comparing the test data of A,Band C,the paper analyzes the influence of the replacement rate of steel fiber and iron ore on the thermal conductivity of concrete.When the steel fiber content is different,the thermal conductivity of ordinary C30 concrete is 1.27 W/m?k.When the steel fiber content is increased to 3%,it is 27% higher than ordinary concrete,which is1.74 W/m?k.When the iron ore replacement rate is different,when the iron ore dressing rate is 100%,the thermal conductivity of the original C30 concrete is increased by 113% to 2.70 W/m?k.The ABAQUS simulation was carried out on the continuous heat storage of concrete energy piles,and the temperature field cloud maps of different days,different soils and different pile diameters were compared and analyzed.Comparing the concrete energy piles of 200 mm,300mm and 400 mm pile diameters,it is concluded that the heat exchange capacity of the energy pile with the diameter of400 mm is the largest.Comparing the heat transfer of the energy pile in different soils,the heat exchange in the rock is the largest,followed by the sand and finally the clay.At the same time,the energy pile group piles in different rock and soil bodies under different pile spacings are simulated.The temperature field cloud maps of the energy piles with 3 times pile diameter,3.5 times pile diameter and 4 times pile diameter are compared and analyzed,and the pile spacing is increased.The thermal interference is gradually weakened,and the heat exchange capacity of the energy pile with 4 times the pile diameter in the rock is the highest.