气垫式调压室热力学特性及其对围岩应力变形的影响  

Study on thermodynamic characteristics of an air cushion surge chamber and its influence on stress and deformation of surrounding rock

作　　者：蒋中明[1,2] 邓自源 唐栋 万发 欧阳钰榕 JIANG Zhongming;DENG Ziyuan;TANG Dong;WAN Fa;OUYANG Yurong(School of Hydraulic Engineering,Changsha University of Science&Technology,Changsha 410114,China;Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province,Changsha 410114,China;Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学水利工程学院,湖南长沙410114 [2]长沙理工大学水沙科学与水灾害防治湖南省重点实验室,湖南长沙410114 [3]长沙理工大学洞庭湖水环境治理与生态修复湖南省重点实验室,湖南长沙410114

出　　处：《水利水电科技进展》2021年第6期58-64,共7页Advances in Science and Technology of Water Resources

基　　金：国家自然科学基金(51778070,52178381)。

摘　　要：为了解气垫式调压室气室内压缩气体温度和压力变化规律及其对调压室围岩的应力变形特性的影响,基于水位波动方程和能量守恒方程,提出了考虑传热影响的调压室压缩空气热力学过程的计算模型,并进行合理性分析。采用裂隙岩体单向热力耦合数值方法,将调压室内空气的压力和温度作为瞬时变化边界条件,对调压室围岩的应力变形特性进行了深入分析。结果表明:在调压运行工况条件下,调压室内的空气压力和温度将发生大幅度波动变化,进而会导致围岩温度也出现相应的改变,且围岩温度呈现出显著的不均匀分布特点;节理裂隙处的岩石温度变化相对较大,且出现了较大的拉应力。To understand the variation process of air temperature and pressure in an air cushion surge chamber and its influence on the stress and deformation characteristics of the surrounding rock,based on the water level fluctuation equation and the energy conservation equation,a thermodynamic model for the compressed air in the surge tank considering the effect of heat transfer between air and surrounding rock was proposed,and the rationality of the model was validated.With the thermo-mechanical coupling numerical method of fractured rock mass,the pressure and temperature of the air in the surge chamber were taken as the instantaneous change boundary conditions for numerical simulation,and the stress and deformation characteristics of the surrounding rock of the surge chamber were analyzed.The results show that under the operating conditions of the surge tank,the air pressure and temperature in the surge chamber can fluctuate considerably,resulting in the surrounding rock temperature change accordingly.The temperature distribution of the rock behaves significantly uneven characteristics.The temperature at the joints and fissures has relatively large variation,and larger tensile stress occurs.

关 键 词：气垫式调压室 压缩空气 热力学过程 节理裂隙 受力特性 

分 类 号：TV732.56[水利工程—水利水电工程]