块系覆岩中摆型波传播对巷道支护动力响应影响

Dynamic response of roadway support on pendulum type waves propagation in overburden block rock mass

为研究支护体自身的动力响应规律,通过理论和计算分析岩体中的非线性摆型波传播对巷道支护动力响应的影响,根据摆型波在非连续自应力块系上覆岩体中传播时的支护动力响应模型,研究上覆岩块间的黏弹性性质及岩块破坏对支护动力响应的影响。通过计算分析得出,上覆岩块间弹性下降时,支护的动态受拉和受压幅值随之下降且周期变大;上覆岩块间阻尼增大时,支护的受拉和受压周期不变,但周期内的微扰动逐渐消失且幅值略有下降;上覆岩块沿垂直冲击方向破裂成两个子块时,支护的受拉和受压次数增加。

In order to research on dynamic response of support, the effect of propagation of nonlinear pendulum type waves on dynamic response of roadway support was analyzed by theoretical calculation. Based on the dynamic response model of support when pendulum type waves propagation on discontinuous and self-stress overburden block rock mass, the support dynamic response was studied. Dynamic response of support was analyzed through the theoretical model when changing overburden block rock partings viscoelastic property and fracture the overburden block. As the compu- tational results, the amplitude of support tensile and compression displacement decreased and periodicity of the dynam- ic response increases, when block rock partings elasticity decrease. Periodicity of support displacement response invari- ability and weak perturbation disappears gradually when block rock partings damping inereaseing, at the same time the amplitude have a slight decline. The frequency of support tensile and compression increase when the overburden block rock fractured into two subblocks on vertical direction of impact.