层面接触刚度对叠合岩梁应力分布的影响规律

Influence Law of Level Contact Stiffness on Stress Distribution of Laminated Rock Beam

摘要: 为探讨层面接触刚度参数对叠合梁应力分布的影响规律，采用FLAC3D建立不同层间接触刚度参数下的双层叠合梁数值计算模型，分析了在均布荷载条件下剪切刚度Ks和法向刚度Kn对两端固定叠合岩梁应力分布的影响。研究结果表明：双层叠合固定岩梁在均布荷载作用下，应力分布与层面接触刚度关系明显。当剪切刚度Ks增大，岩梁水平方向最大拉应力和最大压应力相应减小；增大法向刚度Kn，水平方向拉应力逐渐增加，而压应力逐渐减小。同时当Kn和Ks增大到一定值时，岩梁应力分布受接触刚度改变而变化微小，趋于稳定。通过本文的研究，可对数值计算时合理选取接触刚度参数提供了一定的借鉴。

Abstract: In order to investigate the influence of contact stiffness parameters on the stress distribution of laminated beams, a numerical model of double deck laminated beams under different contact stiffness parameters is established by FLAC3D, and the influence of shear stiffness Ks and normal stiffness Kn on the distribution of stress distribution on both ends of the laminated beam under uniform load conditions is analyzed. The results show that the stress distribution of the double deck fixed rock beam under uniform load is obviously related to the contact stiffness of the layer. When the shear stiffness Ks increases, the maximum tensile stress and the maximum compressive stress in the horizontal direction of the rock beam decrease, and the tensile stress in the horizontal direction increases gradually with the normal stiffness Kn, and the compressive stress gradually decreases. At the same time, when Kn and Ks increase to a certain value, the stress distribution of rock beam changes slightly with the change of contact stiffness, and tends to be stable. Through the research in this paper, it can provide some reference for selecting reasonable contact stiffness parameters in numerical calculation.