钢衬壁厚对抽蓄电站围岩内水压力分担率的影响

发布时间：2019-08-05 14:59

【摘要】：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。
[Abstract]:According to the practical engineering needs, the displacement and deformation characteristics of steel lining, concrete cushion and surrounding rock under different design internal water pressure combination conditions and the circumferential tensile stress of steel lining are analyzed by using FLAC3D numerical simulation software, and the influence of diversion steel lining wall thickness on the water pressure sharing rate in surrounding rock is studied. The results show that with the increase of wall thickness, the radial displacement and circumferential tensile stress of steel liner can be reduced accordingly, but the amplitude reduction is small and the effect is not significant. With the decrease of wall thickness, the radial displacement of steel liner becomes larger, which is helpful to load transfer according to deformation coordination, improves the sharing rate of surrounding rock, and is beneficial to the joint bearing of "steel lining, cushion and surrounding rock". Under the premise of satisfying the checking calculation of anti-external pressure stability, welding technology and construction and installation, the wall thickness can be greatly reduced. The research results are not only helpful to reduce unnecessary investment, but also to reduce the construction difficulty such as chamber steel lining transportation and installation, which can be used as a reference for similar engineering design.
【作者单位】：国网新源控股有限公司技术中心;中国科学院地质与地球物理研究所;
【基金】：国网新源科研项目(JXKY201503)
【分类号】：TV732

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