诱导条件下节理岩体流变断裂自然崩落判据研究

Study on the Criteria for the Rheological Fracture and Spontaneous Caving of Jointed Rock Mass under Inducement Conditions

对诱导条件下节理岩体流变断裂问题进行了深入研究,归纳出了节理岩体流变断裂3类不同破坏机制,确定了以分支裂纹扩展长度作为节理岩体破坏评判依据的3种破坏机制时的统一流变断裂破坏准则。在此基础上,首次提出了节理岩体在重力作用下产生自然崩落的3个必要条件为破坏条件、临空面条件和平衡条件,并推导和建立了岩体流变断裂破坏和自然崩落的判据数学表达式,最后将研究成果转化成了计算机程序,为流变断裂型矿岩自然崩落规律研究和崩落速度预测提供了一条新的有效方法。

The paper studies in-depth the rheological fracture of jointed rock mass under inducement conditions, sum- marizes the three different destruction mechanism of theological fracture, and determines to use the branch crack propaga- tion length as a unified criterion for the three destruction mechanisms in judging jointed rock mass destruction. On this ba- sis, the paper proposes for the first time that the three requirements for a spontaneous caving of jointed rock mass under gravity be destruction conditions, free face conditions and equilibrium conditions, and deduces and establishes the criterion mathematical expression for the rheological fracture and spontaneous caving of jointed rock mass. The study results are then turned into a computer program, providing a new efficient method for the study of spontaneous caving law and the forecast caving speed forecast of rock mass of rheological fracture type.