基于改进Haskell模型的断层滑移型岩爆震源模拟研究

Simulation of fault slip rockburst seismic source based on improved Haskell model

断层滑移型岩爆事件已经成为影响地下矿山安全开采的重大问题。为深入了解断层滑移型岩爆事件对岩体及支护系统的影响,采用三维离散元程序3DEC,开展断层滑移的数值模拟研究。通过比较常用的震源模型,根据断层滑移形状及滑移特征,构建基于改进Haskell模型的断层滑移型岩爆震源模型。从荷载施加、断层面滑移及震源远区岩体质点振动响应等方面,验证改进的Haskell模型在模拟断层滑移方面的有效性。改进Haskell模型的计算结果与位移理论计算公式、质点振动速度经验公式等结果一致,结果表明,改进的Haskell模型能够很好模拟断层滑移震源特征以及合理的岩体震动响应。

Fault-slip rockbursts have been a great threat to the safety in deep underground mine. In order to understand the effect of fault-slip rockburst events on the rockmass and support system, research on the seismic source simulation of fault-slip rockburst was conducted by using three dimensional discrete element code 3DEC. Considering the commonly used seismic source model, according to the shape and feature of fault slip, an improved Haskell＇s model for fault-slip rockburst source was built, which overcomes the deficiency of Haskell model in rupture velocity and displacement boundary. The improved Haskell＇s model was validated in the aspects of velocity loading, fault slip distance and rockmass vibration in far-field, and the results from the Haskell model agree well with that obtained from theoretical calculation and empirical formulation. The results show that the improved Haskell model can be used to simulate the fault-slip source well and obtain reasonable response of rockmass vibration, providing an important basis for suitable support system designs.