【摘要】 岩质高陡边坡在爆破作用下的动力响应规律十分复杂,采用现场爆破振动测试和ANSYS数值模拟时程分析相结合的方法进行研究有效可行。为了解爆破振动对边坡稳定性的影响,摸清边坡爆破开挖的动力响应规律,采用施工现场爆破振动测试结果分析和ANSYS动力响应时程分析相结合的方法对一工程边坡进行分析研究。爆破振动测试结果分析表明:对于岩质高陡边坡,当爆破规模较大时,振动速度可能沿高程出现放大效应,应尽量采用没有放大效应或者放大效应较弱的爆破方式,以减小爆破振动,提高边坡在爆破动力作用下的稳定性。ANSYS时程分析表明:(1)各种应力值较小,但存在集中现象;(2)各节点的位移也较小,边坡未出现塑性变形;(3)速度模拟值与实测值基本吻合;(4)若仅考虑爆破动力影响,不足以使边坡产生整体破坏;(5)随着爆破规模的增大,出现较明显的速度放大效应和惯性滞后效应;(6)模拟计算的边坡动应力、位移和速度等特征能够较好地反映边坡的动态响应特征。数值模拟结果与现场测试结果吻合较好,对类似工程具有一定的指导意义。更多还原

【Abstract】 The dynamic responses of high steep rock slopes are complex under blasting,which are commonly analyzed by combining field blasting vibration tests with ANSYS time-history analyses.A slope was analyzed using this method to investigate the influence of blasting vibration on slope stability and to find out the dynamic response rules of slope under blasting excavation.Analyses of blasting vibration tests show that vibration velocity may be magnified along elevation for high steep rock slopes when the blasting scale is large.Blasting methods without or with little amplification effect should be adopted to reduce the vibration and increase the dynamic stability of the slope.ANSYS time-history analyses show that:(1) The values of stresses are small but stress concentration occurs;(2) The nodal displacements are small and no plastic deformation happens in the slope;(3) The simulated values of velocity is consistent with the measured ones;(4) If only the dynamic effect of blasting is considered,the slope will not fail wholly;(5) As the blasting scale increases,obvious velocity amplification effect and inertia hysteresis effect happen.(6) The dynamic stress,displacement and velocity simulated by ANSYS can reflect the dynamic response characteristics of the slope well.The results of numerical simulations accord well with field testing results,providing guidance to similar projects.更多还原