层状岩石力学特性及能量演化各向异性规律

On Mechanical Properties and Energy Evolution Anisotropy of Layered Rocks

为研究层状岩石在不同倾角条件下的力学特性及能量演化各向异性规律,设计6种不同倾角大理石试样的单轴压缩试验,分析层状岩石特征应力点的力学特征和能量的倾角效应,揭示层状岩石的破坏特征各向异性机理.研究结果表明:随着倾角的增大,层状岩石单轴抗压强度先减后增,弹性模量则逐渐降低;在层状岩石的受压过程中,能量分布存在明显的各向异性,且倾角较小时,弹性能占比较大,相反,耗散能占比较大;受载方向和层理面倾角的不同使得层状岩石的承载破坏方式不同,这是导致层状岩石的力学特性和能量规律出现差异的主要原因.研究结果可为矿井灾害发生机理和防治研究提供理论指导.

To study the mechanical properties and energy evolution anisotropy of layered rocks under different inclination angles,six types of uniaxial compression experiments on marble samples with inclination angles are designed,and the mechanical characteristics of the characteristic stress points of layered rocks and the inclination effect of energy are analyzed.The anisotropy mechanism of failure characteristics of layered rocks is described.The research results show that as the inclination angle increases,the uniaxial compressive strength of layered rocks first decreases and then increases,while the elastic modulus gradually decreases.During the compression process of layered rock,the energy distribution has obvious anisotropy.When the inclination angle is small,the elastic energy accounts for a larger proportion.On the contrary,the dissipated energy accounts for a larger amount.The loading direction and the angle of the bedding plane make the layered rock load-bearing failure mode different,which is the main reason for the difference in the mechanical properties and energy laws of the layered rock.The research results have provided theoretical guidance for the research on the occurrence mechanism and prevention of mine disasters.