层理特性对层状岩体剪切力学特性的影响研究

Influence of Bedding Plane Characteristics on the Shear Mechanical Properties of Layered Rock Masses

当前对层状岩体力学特性的研究多涉及抗压及抗拉特性,为研究层状岩体剪切破坏过程中的强度和弹性变形参数及破坏特征,通过基于人工制样方法,开展不同层理倾角、层理间距及层理粘结强度下层状岩体直剪试验,结果表明:随着层理倾角的增大,层状类岩体的抗剪强度指标呈现先增大、后减小、再增大的变化趋势,在30°左右量值最大,在60°左右量值最小;当层间粘结强度与岩层强度接近时,层理间距对其剪切特性的影响较小;层理粘结强度的提高会增强试样的抗剪强度。

At present, the study on the mechanical properties of layered rock mass mainly focus on the compressive and tensile properties. In order to analyze the strength and elastic deformation characteristics of the layered rock mass during shear failure, the artificial sample preparation method is adopted. The direct shear tests of layered rock mass under different inclination angles, bedding plane spacing and bedding plane strength are carried out. The experiment results show that with the increasing of inclination angles, the shear strength parameters increased firstly, then decreased and then increased again. The maximum value is acquired at 30 degree and the minimum value is acquired at 60 degree. The bedding spacing has little effects on the shear properties since the bond strength between layers is close to the strength of intact rock. Meanwhile, the increasing of the bedding plane strength will enhance the shear strength of the layered rock specimen.