高压水道钢筋混凝土夹心钢板衬砌研发与性能验证

针对高压水道中钢筋混凝土衬砌内水外渗以及钢板衬砌易于溃屈问题，研发了一种高压水道钢筋混凝土夹心钢板衬砌，主要由内层钢筋混凝土-钢板-外层钢筋混凝土组成。为验证新型衬砌性能，进行了高内外水交替作用下模型试验，研究衬砌变形受力及荷载分担变化情况。结果表明：外水压力作用下衬砌处于受压状态，各部分荷载分担比较为固定，钢板部分所受压应力仅为1.47 MPa，远低于临界应力20.25 MPa，失稳溃屈的风险极小;内水压力作用下衬砌处于受拉状态，随着内水压力的增加，内层混凝土会先于外层混凝土开裂，未开裂前衬砌各部分荷载分担比基本固定;开裂后混凝土部分分担荷载降低、钢板与围岩所分担荷载增加，钢板所受拉应力为28.01 MPa，远低于其极限强度。相较于传统衬砌，新型衬砌结构在高压水道环境下具有更优越的性能。

Research and performance verification of high-pressure waterway reinforced concrete sandwich steel plate lining

To address the issues of water seepage and susceptibility to buckling in steel plate linings of high-pressure 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 external water pressures to examine deformation stresses and load-sharing variations.The results revealed that under external pressure，the lining maintains a compressed state with a relatively constant load distribution among its components.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 lining is subject to tension，with the inner concrete layer prone to cracking before the outer layer.Prior to crack formation，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 aquatic environments.