为深入研究在气压与温度循环作用下地下高压储气库结构的瞬态温度场变化特征,基于热力学控制方程推导出储气库气压与温度变化曲线,并对钢衬﹣混凝土界面接触热阻对热传导过程的影响进行了分析。在此基础上,探讨了单次循环与多次循环条件下储气库结构温度场的演变规律。研究表明:储气库结构温度变化呈现出显著的波动性,特别是在洞室表面附近,温度波动幅度尤为显著;随着温度荷载循环次数的增加,热量逐渐累积,结构温度场在大约15次循环后达到动态平衡状态;而在距离洞室表面3 m以上的围岩区域,温度波动现象及热量累积效应均不甚明显。
In order to deeply study the characteristics of transient temperature field changes in underground high-pressure gas storage structures under the action of air pressure and temperature cycles. Based on the thermodynamic control equations, the curves of gas pressure and temperature changes in the reservoir are derived, and the influence of contact thermal resistance at the steel liner-concrete interface on the heat transfer process is analyzed. On this basis, the evolution of the temperature field of the gas storage structure under single-cycle and multiple-cycle conditions was further explored. It was found that: The temperature change of the gas storage structure showed significant fluctuation, especially near the surface of the cavern, where the temperature fluctuation was particularly significant. With the increase of the number of temperature loading cycles, the heat is gradually accumulated, and the structural temperature field reaches the dynamic equilibrium state after about 15 cycles; while the temperature fluctuation phenomenon and the heat accumulation effect are not obvious in the surrounding rock area which is more than 3 meter away from the surface of the cavern.
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