基于波场等效的节理面刚度参数取值研究

Study on the Value of Joint Stiffness Parameters Based on Wave Field Equivalence

节理岩体中的节理面往往有一定厚度,如果采用无厚度的线性节理模型分析,其刚度参数的确定非常困难。通过分析弹性波穿过节理面时的波场效应,建立了基于节理后振动强度相等的波场等效法,用于确定带厚度节理的刚度参数,并分析了各因素对弹性波在节理上传播的影响。结果表明:线性节理面的刚度参数是节理岩体的固有属性,与外界荷载无关,采用波场等效法计算刚度参数可行;在弹性波范围内,这种等效参数与入射波频率、入射角等因素关系不大。该方法可用于有厚度节理面动强度参数的确定与分析,完善现有的节理面刚度取值方法。

In jointed rock mass,the joint surface always has a certain thickness. It is difficult to determine the stiffness parameters with a linear joint surface model. By studying the wave field generated when the elastic waves penetrating the joint surface,the wave field equivalence method with the same vibration strength after penetration was established. The method can be used to determine the stiffness parameters of joint rock mass with certain thickness,and to analyze the impact of various factors on the propagation of elastic waves on joint surface. Results show that： the stiffness parameters of linear joint plane are the inherent property of joint rock mass which is unrelated to outside load and it is feasible to use wave field equivalence method to calculate stiffness parameters. Within the range of elastic wave,the equivalent parameters have no significant relations with the frequency of incident wave and incident angle.The method can be employed in the determination and analysis of dynamic strength parameters of joint plane and improve.