高压水道钢筋混凝土夹心钢板衬砌研发与性能验证OA北大核心CSTPCD

To address the issues of water seepage and susceptibility to buckling in steel plate linings of high-pres-sure waterways,a novel reinforced concrete sandwich steel plate lining has been devised.This lining,primarily comprising an inner layer of reinforced concrete,a steel plate,and an outer layer of reinforced concrete,aims to enhance structural integrity.Performance validation involved a model test under alternating high internal and exter-nal water pressures to examine deformation stresses and load-sharing variations.The results revealed that under ex-ternal pressure,the lining maintains a compressed state with a relatively constant load distribution among its com-ponents.The steel plate experienced a compressive stress of only 1.47 MPa,which is significantly lower than the critical stress of 20.25 MPa,indicating a minimal risk of instability or buckling.Under internal pressure,the lin-ing is subject to tension,with the inner concrete layer prone to cracking before the outer layer.Prior to crack for-mation,the load-sharing remains essentially unchanged.After cracking,the load borne by the concrete decreases and that borne by the steel plate and the surrounding rock increases.Despite this,the steel plate's tensile stress does not exceed 28.01 MPa,which is far lower than its ultimate tensile strength.Relative to conventional linings,this innovative structural solution demonstrates enhanced performance in managing the demands of high-pressure a-quatic environments.