基于数值模拟技术的爆破动力荷载对边坡的稳定性影响研究

Study into influence of blasting dynamic load on slope stability based on numerical simulation

爆破作为一种外部的动力学荷载,对边坡的稳定性有着极为重要的影响。本文考虑爆破的地震效应,采用Ansys/Lesdyna动力有限元数值模拟方法研究爆破动力荷载强度,利用实测爆破监测数据对反演爆破动力荷载进行校正,并将校正后的爆破动力荷载强度作为建立的有限差分边坡数值模拟模型动力荷载边界,分析岩石边坡在爆破振动下的扰动作用,不同部位对振动速度、位移及其应力的响应特点。结果表明,采用动力有限元数值模拟法提出的边坡速度、位移、塑性区变化能比较真实地反映动力响应结果以及爆破振动的扰动作用。

As a type of external dynamic load, blastings impact greatly on the stability of slopes. This paper used Ansys/Lesdyna dynamic finite element simulation technology to study the blasting dynamic loading intensity, and corrected the blasting dynamic loading by the monitoring data of the blasting. The corrected blasting load intensity was then taken as the dynamic load boundary of the established finite difference slope simulation model, to analyze the disturbance of rock slope under blasting vibraton and the influence of different site on vibrational velocity, displacement and stress. Results show that, the vibration velocity, displacement values and plastic zone of slope obtained by the dynamic FE simulation can objectively and truly reflect the dynamic response results of slopes in blasting vibration and the disturbance effects of blasting.