| In the serious air pollution today,clean energy is favored.The heating method of geothermal water extraction,household transfer and recharging underground through thermal reservoir has become the main choice for more cities.However,considering the shortage of well formation technology and economic benefits in many areas,geothermal water cannot be fully restored to the underground,and the waste in most areas is still quite serious.When the surrounding environment is poor,there are buildings around,and the water loss is large,it is easy to cause the ground settlement around the area and a small area of the earthquake,resulting in loss of life and property.Therefore,how to increase the recharge and then reduce the settlement caused by the small amount of recharge is an important research content in engineering.By consulting relevant literature and combining with experiments and simulations,the following conclusions are drawn:1.Firstly,according to a large number of field tests,five groups of Wells with different technologies and different service life were selected for comparison.The study found that in today’s geological conditions and engineering applications,the recovery/irrigation ratio ranges from 26% to 81.62%,and the geothermal resource waste is still serious.2.The ABAQUS simulation software was used as the geothermal well in the same layer pressure model,and the pressure was taken as the internal factor and briefly analyzed.It was concluded that the relationship between the recharge amount and the recharge pressure was consistent with the power function of the relationship between the flow rate and the depth reduction in conventional steady flow pumping,and the most appropriate pressure was about 0.32 mpa.Secondly,an optimization study was carried out in the case of single well,and five different well spacing were designed.The results showed that the larger the spacing between two Wells,the greater the settlement,and the more suitable it was in the case of 440 m.3.On this basis,the combination method of two pumping and three irrigation at440 m interval is determined to be more reasonable after the well addition simulation and comprehensive consideration is given to the problem that the settlement amount and settlement range can be reduced on the premise of not producing thermal penetration and thermal breakthrough and ensuring the seepage flow efficiency,and the economy and feasibility can be demonstrated.4.Considering that the diameter is changed to increase the volume,and then the resistance is increased or reduced,the optimization analysis of the diameter is made.Considering the exaggerated effect of the simulation on the diameter,the conclusion is that the settlement of different diameter is less than 0.5cm,which is only applicable to the change of the important joints of the well.5.The site was directly analyzed in 3D mode,and the well spacing was optimized to 440 m.The conclusion shows that the settlement size after optimization is only reduced by 0.13 cm,but the settlement range is greatly reduced,which proves the importance and correctness of optimization.Adopt in this paper,we study the law of the variety of different angles can be different attempts,using experimental data trends,provide reference for the other direction experiment,using ABAQUS simulation software,finally choose to adopt the method of two three irrigation increased both recharge quantity at the same time reduce the settlement,also can reduce due to ground subsidence caused by other problems.It can be seen that this series of analysis can provide a strong basis for the recharge of geothermal water and has a good application prospect. |
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