中文摘要：

基于接触非线性和开裂非线性理论,采用ABAQUS程序对某水电站地下厂房蜗壳结构进行了三维非线性有限元计算,研究了水电站垫层蜗壳结构中垫层平面铺设范围对厂房蜗壳结构特性的影响。研究结果表明：蜗壳结构中垫层平面铺设范围分别自蜗壳进口铺至0°、45°、135°和270°断面时,垫层铺设范围越大,环向钢筋应力和混凝土损伤区域明显减小,相较于0°方案,其他3种方案的最大裂缝宽度和发电机基础不均匀上抬位移均有明显减小。

英文摘要：

Based on the contact and cracking nonlinear theory,a three-dimensional nonlinear finite element analysis on the underground powerhouse structure in a hydropower station is carried out using the ABAQUS software to investigate the effects of the laying scope of cushion layer on structural characteristics of the spiral case structure. Four schemes are simulated,in which the cushion layers are started from the inlet of the spiral case and ended at the sections of 0°,45°,135° and 270°,respectively. The results show that the bigger the laying scope is,the less the stresses of the circumferential reinforcement and the damage area of the concrete are. Compared with the scheme of ending at the section 0°,the maximum crack widths and the non-uniform rising of the generator foundation in other three schemes are obviously reduced.