清江隔河岩工程石龙洞灰岩力学模型分析

Analysis on Mechanical Models of Shilongdong Limestone of Geheyan project

本文通过清江隔河岩水利枢纽30块岩样的三轴试验,得到了石龙洞灰岩的强度包线方程,并侧重分析了不同围压状态下岩石的破坏机制,进而分别建立了力学模型,其中包括: σ_2=σ_3<5MPa时的线弹性方程; 5MPa≤σ_2=σ_3<80MPa时的软化模型; σ_2=σ_3=80MPa时的理想弹塑性模型; σ_2=σ_3>80MPa时的线性强化弹塑性模型。 在成果的分析应用和推广方面,文中还较深入讨论了: 1.利用普通柔性三轴试验机和直剪试验仪来研究σ～ε全过程曲线的方法; 2.通过三轴强度包线来整理仓库参数(c、f)的方法。

By means of triaxial test of thirty rock specimens of Geheyan project, strength envelope equation of Shilongdong limestone has been obtained。 This paper emphatically analyzed the mechanism of fracture of rock under the different states。 And then mechanical models are further established respectively. Those contain:Linear-elastic equation when σ2= σs<5MPa; Softening model when 5 MPa σ2= σ3<80MPa; Ideal elasto-plastic model when σ2= σ3=80MPa; Linear-hardening elasto-plastic model when σ2= σs>80Mpa。 This paper also presented and discussed with respect to the following methods, such as.1 .how to use the common flexible triaxial test machine and direct shear equipment to study the whole process curve of σ、ε;2 .how to use triaxial strength envelope to process the Coulomb parameters ( c.f )