摘要
采用热力耦合数值模型定量分析埋深对压气储能内衬洞室稳定性的影响.通过建立洞室内空气能量和质量守恒方程、洞室传热控制方程以及热弹性受力变形控制方程,从而建立压气储能内衬洞室热力耦合计算模型.对不同埋深时的压气储能洞室其受力变形特征进行模拟,对一个周期内的应力及变形进行分析,获得了不同埋深对压气储能内衬洞室稳定性的影响.数值模拟结果表明:埋深对密封层第一主应力和第三主应力影响不大.埋深越大,衬砌拉应力越小,而压应力越大;埋深只影响衬砌一个周期内前几个小时以及后几个小时的第三主应力值,对其余阶段应力影响不大.埋深越大,围岩压应力越大,第一主应力波动幅度越小;埋深增加,第三主应力增加.埋深越大,水平位移越小.每个时间节点洞顶竖向位移均随埋深的增加而减小.
An quantitative analysis of the impact of cover depth on the stability of a lined rock cavern for com- pressed air energy storage （CAES） was made using the coupling thermo-mechanical numerical simulation. The mass and energy conservation for air in the cavern, governing equations for heat transfer and thermo-elastic load- ing and deformation were set up, which were coupled to constitute the model for compressed air energy storage in a lined rock cavern. The stress and deformation characteristics of the lined rock cavern for CAES under different cover depths were simulated and stress and deformation in a typical cycle were analyzed to take the effect of depth into account. The numerical simulation shows that the cover depth has a negligible effect on the first and third principal stresses of sealing layer. Lager cover depths result in a lager compressed stress and a smaller tensile stress in the concrete. The depth just affects the third principal stress in the first few hours and the last few hours in one cycle for the concrete, however, it affects the stresses less at other stages. A lager cover depth causes a larger compressive stress and smaller amplitude of first stress for the rock. In addition, the third principal stress for rock increases with the increase in depth. The vertical displacement at the top of the cavern at each time node decreases when the cover depth increases.
出处
《绍兴文理学院学报》
2016年第9期1-7,共7页
Journal of Shaoxing University
关键词
压气储能
内衬洞室
第一主应力
第三主应力
环向应变
洞壁位移
compressed air energy storage
lined rock cavern
first principal stress
third principal stress
hoopstrain
displacement of the cavern wall
