影响剪切梁层间失效模型的参数分析

Parameter analysis influencing shear beam model for interface failure

用剪切梁层间失效模型来分析地震的发生并考虑关键参数的变化对模型的影响。将岩体简化为弹塑性竖向夹层粘结在一起的剪切梁,考虑了侧压力沿竖向的变化;分析了岩体的位移和应力分布规律,建立了地震发生的条件,得到了层间裂纹产生及其扩展受材料特性等参数影响的变化规律。应力分布和弹性断裂理论所得值相比没有那样的奇异性,但比弹塑性分析所得值有更高的应力集中,比较符合岩石工程的实际。

Shear beam model for interface failure was used for the earthquake occurring analysis considering the crucial parameters that affect this model. Rock body was simplified to shear beams with elastic-plastic vertical interface layer. Side pressure change along vertical were considered. Analytical solution was given for rule of rock displacement and stress distributions and forming and developing of the crack in interface layer. A condition of earthquake occurring was set up. The rules that flaw generation and development which were affect by materials character and other parameters were obtained. Stress distribution value is rational compared with the theory of the elasticity crack. But it has the higher stress concentration, which is in accordance with the reality of rock engineering.