废弃矿洞抽水蓄能地下储水空间多场耦合特性研究

我国能源结构中清洁能源电力占比不断提高,电力行业对电力储蓄的需求日益迫切.同时,随着我国大批资源枯竭及落后产能矿井和露天矿坑加快关闭,形成大量的关闭/废弃矿洞,大量矿业废弃迹地亟待治理.废弃矿洞抽水储能技术是可能综合解决上述问题的方法之一.本文通过数值模拟与模化实验相结合的方法,对废弃矿洞抽水蓄能电站地下围岩的多场耦合...

Study on Multi Field Coupling Characteristics of Underground Water Storage Space for Pumped Storage in Abandoned Mine

With the increasing proportion of clean energy power in China’s energy structure,the demand of power industry for power savings is increasingly urgent.On the other hand,with the rapid closure of a large number of mines and open pits with exhausted resources and backward production capacity,a large number of closed/abandoned mines are formed,and a large number of abandoned mining sites need to be treated.Pumping and energy storage technology in abandoned mine cavern is one of the methods to solve the above problems.In this paper,the multi-field coupling characteristics of Pumped Storage Power Station Based on abandoned mine are studied by numerical simulation and modeling experiment.The results show that 4-6 hours in the early stage of water storage is the time domain with large temperature gradient of surrounding rock.In this time domain,the large temperature gradient caused by the change of water temperature is about 400mm deep into the surrounding rock of the roadway;under the condition of the existence of thermal stress,there is a strong coupling between the thermal stress and the distribution of temperature field in the surrounding area of the roadway after water filling.There is stress concentration at the bottom corner of the roadway and at the vault.These areas are dangerous areas that need special attention to the strength of surrounding rock;under the combined stress coupling condition of loading water load,ground pressure load and thermal stress load at the same time,the thermal stress and internal water pressure of roadway water filling will have a greater coupling effect on the stress field of surrounding rock,which is quite different from that under the condition of uncoupled thermal stress.This coupling effect should be fully considered in the design of future abandoned roadway pumped storage power station.