考虑接触面的浆砌石重力坝变形与应力分析

Analysis of Deformation and Stress of Masonry Gravity Dam Considering Contact Surface

浆砌石重力坝由于胶结材料、条石两种筑坝材料存在较大的物理力学差异,不宜视为均质体。通过在有限元模型中建立接触面,模拟条石之间的胶结材料,建立考虑胶结接触面的浆砌石重力坝计算模型,进一步研究坝体在校核洪水位工况下的变形和应力情况。结果表明,设置接触面后,坝体顶部和底部均向上游发生变形,坝体中部向下游发生变形,坝体内部沿着接触面产生大量拉应力,混凝土防渗面板和坝基出现塑性区;随着接触面折减系数的减小,坝体变形量不断增加,坝体最大拉应力逐渐从坝体中部转移到坝体底部,坝体底部与坝基接触面的塑性单元不断增多,极易形成塑性贯通区,该接触面是坝体的最危险滑动面。

Due to the large physical and mechanical differences between cementing materials and strip-rock dam construction materials,the grout masonry gravity dam should not be regarded as a homogeneous body.In this paper,by establishing the contact surface in the finite element model,simulating the cementing material between the strips,the calculation model of the grout masonry gravity dam considering the cementing contact surface is established,and the deformation and deformation of the dam body under the condition of checking the flood level are further studied.The results show that after setting the contact surface,the top and bottom of the dam body deform upstream,the middle part of the dam body deforms downstream,a large amount of tensile stress is generated inside the dam body along the contact surface,and a plastic zone appears in the concrete anti-seepage panel and the dam foundation.As the reduction coefficient of the contact surface decreases,the deformation of the dam body increases continuously,and the maximum tensile stress of the dam body gradually transfers from the middle of the dam body to the bottom of the dam body.The plastic penetration zone is formed,and the contact surface is the most dangerous sliding surface of the dam body.