论文部分内容阅读
根据实际工程需要,采用FLAC3D数值模拟软件通过改变钢衬壁厚,分析了不同设计内水压力组合条件下,钢衬、混凝土垫层和围岩的位移和变形特征及钢衬环向拉应力,研究了引水钢衬壁厚对围岩内水压力分担率的影响。结果表明,随着壁厚增大,虽可相应减少钢衬径向位移和环向拉应力,但减幅小,效果不显著;随着壁厚变小,钢衬径向位移变大,根据变形协调,有助于荷载传递,提高了围岩分担率,有利于“钢衬-垫层-围岩”联合承载;在满足抗外压稳定验算、焊接工艺和施工安装前提下,壁厚可较大幅减小。研究成果不仅有利于减少不必要的投资,还有利于降低硐室钢衬运输安装等施工难度,可供类似工程设计参考。
According to the requirement of actual project, the displacement and deformation characteristics of steel lining, concrete cushion and surrounding rock and the tensile stress of steel lining were analyzed by changing the wall thickness of steel liner by FLAC3D numerical simulation software. The influence of the wall thickness of waterinjected steel on the water pressure sharing rate in surrounding rock was studied. The results show that with the increase of the wall thickness, the radial displacement and the circumferential tensile stress of the steel lining can be reduced correspondingly, but the reduction is insignificant and the effect is not significant. As the wall thickness becomes smaller, the radial displacement of the steel lining becomes larger. Deformation coordination, contribute to load transfer, improve the sharing rate of surrounding rock, is conducive to “steel liner - cushion - surrounding rock” joint bearing; in the stability against external pressure checking, welding technology and construction and installation of the premise, the wall Thicker can be significantly reduced. The research results are not only conducive to reducing unnecessary investment, but also help to reduce the construction difficulty such as the installation and installation of steel liner in the chamber, which can be used as a reference for similar projects.