压气储能地下洞室密封钢衬的非线性力学响应特征OACSTPCD

Based on a actual pressurized air storage power station project,the nonlinear influencing factors on the stresses of sealing steel lining(SSL)of the underground air storage caverns are studied based on ABAQUS platform,and the influencing mechanism of the external material's nonlinearity and the contact nonlinearity of SSL-concrete lining(CL)are investigated,respectively.The results show that,(a)the stress level of surrounding rock of shallow underground air storage caverns is not high,and huge air pressure leads to local plastic yielding of the surrounding rock,as a result,the high stress zone of SSL,serious cracking zone of CL and plasticity zone of surrounding rock have a corresponding relationship;(b)considering the contact relationship of SSL-CL makes the steel lining's stress distribution more uniform;(c)after the air pressure is relieved,the SSL is disengaged from the CL at the top under gravity,and after the overhaul and air re-pressurized,the SSL's stress distribution shows an adjustment phenomenon,and the stress peak at top and stress inhomogeneity are increased;(d)the stress of SSL increases with the increase of friction coefficient and gap value,and the effect is not obvious when the friction coefficient is greater than 0.5,but the stress gradient from the gap between SSL and CL is roughly 30-40 MPa/mm;and(e)both the material nonlinearity and contact nonlinearity should be considered in the stress analysis of SSL in underground air storage caverns to ensure that the SSL has enough safety reserve.