稳定性动力准则的圆形洞室岩爆分析

Analysis on Circular Chamber Rockburst by Dynamic Stability Criterion

本文根据一般稳定性理论,提出了洞室岩爆发生的扰动响应判别准则,得到了发生岩爆的洞室临界塑性区深度及临界作用应力。认为洞室失稳是其本身结构固有的性质,只要外界应力达到临界值,洞室就可能在扰动下失稳,并指出岩石弹性模量E和峰值后降模量λ之比E/λ是决定洞室稳定性的重要参数。

On the basis of the general stability theory, a disturbance response stability criterion for circular chamber rockburst is presented. The critical plastic softening depth and critical load of the chamber were obtained. It is concluded that the instability (rockburst) is an intrinsic attribution of rock chamber. As the external load on the chamber approaches to critical load, the chamber would lose its stability by small disturbance. The ratio of elastic modulus ?to descending modulus λ, E/λ, is an important parameter in rockburst analysis.