深部岩爆演化机制的耗散结构理论分析

Theoretical Analysis on Dissipative Structure of Evolution Mechanism of Deep Rock Burst

从能量分析的角度,利用系统科学中的耗散结构理论与尖点突变模型研究深埋地下空间围岩体系统岩爆等岩体突然失稳破坏的演化机制。通过分析深埋地下空间局部围岩体系统的开放性、远离平衡态和非线性,符合耗散结构理论要求的3个特征,说明发生岩爆等岩体突然失稳破坏的深埋局部围岩体系统是一种典型的耗散结构,符合耗散结构从无序向有序发展的一般规律。通过建立尖点突变模型,解释了深部岩爆发生的"突发"机制;通过建立深埋地下空间力学模型及其本构方程,得到深部岩爆等围岩体突然失稳破坏危险性的评价指标。

From the perspective of energy analysis,the evolution mechanism of sudden instability and failure of rock mass such as rock burst in surrounding rock mass system in deep buried underground space was studied by using the dissipative structure theory in system science and the cusp catastrophe model.The openness,far from the equilibrium state and nonlinearity of the local surrounding rock mass system in the deep buried underground space were analyzed,which was consistent with the required three characteristics of dissipative structure theory.It indicated that the deep buried local rock mass system with sudden instability and failure of rock mass such as rock burst was a typical dissipative structure,agreeing well with the general law of dissipative structure from disorder to order.The model of cusp mutation was established to explain the burst mechanism of deep rock burst.Moreover,by establishing the mechanical model of deep underground space and its constitutive equation,the evaluation indexes of sudden instability and failure of rock mass such as rock burst were obtained.