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以金沙江白鹤滩水电站工程为背景,结合相关的岩石力学试验方法,建立了柱状节理岩体三维离散元模型,对柱状节理岩体进行了三轴压缩试验数值模拟。数值试验研究了六棱柱形柱状节理岩体柱体直径变化、四棱柱形柱状节理岩体柱体边长、节理错距变化对其等效弹性模量的影响。为研究随机柱状节理岩体柱体尺寸对岩体等效弹性模量的影响,提出柱体大对角线长尺寸控制方案,并研究了柱体大对角线长变化对岩体等效弹性模量的影响。通过与现场试验的对比研究,结果表明:随机柱体尺寸控制方案可靠;柱体尺寸的变化对与柱体垂直方向的等效弹性模量影响较大,是主要影响因素;四棱柱形柱状节理岩体错距变化主要对与错距平行的岩体等效弹性模量产生影响,对其它两个方向的等效弹性模量的影响较弱,是次要影响因素。研究结果为工程实践中等效力学参数的确定提供了相关参考。
Based on the project of Baihetan Hydropower Station on the Jinsha River, the three-dimensional discrete element model of columnar jointed rock mass is established and the triaxial compression tests of the columnar jointed rock mass are numerically simulated with related rock mechanics test methods. Numerical experiments are carried out to study the effects of the variation of cylinder diameter of hexagonal columnar columnar jointed rock mass, the length of side column of quadrangular columnar columnar jointed rock mass, and the joint displacement on the equivalent elastic modulus. In order to study the effect of columnar rock mass size on the equivalent elastic modulus of rock mass, a long-diagonal large-scale control scheme was proposed. The effect of long diagonal length of column on the equivalent elastic modulus Effect of modulus. The results of comparison with the field tests show that the random cylinder size control scheme is reliable; the change of cylinder size has a great influence on the equivalent elastic modulus of the cylinder in the vertical direction, which is the main influence factor; the prismatic columnar joint The variation of rock mass displacement mainly affects the equivalent elastic modulus of the rock mass parallel to the offset distance, and has a weak influence on the equivalent elastic modulus in the other two directions, which is the secondary influential factor. The research results provide relevant references for the determination of equivalent mechanical parameters in engineering practice.