爆破扰动下顺层岩质破碎高陡边坡的稳定性监测与数值分析

Stability monitoring and numerical analysis of high and steep slope with broken bedding rock under blasting disturbance

高陡顺层岩质边坡历来是国内外学者重要的研究内容,高陡顺层岩质边坡稳定性对于露天矿山的安全建设具有重要意义。因此针对某露天矿山终了顺层岩质边坡的稳定性进行了研究,旨在分析该矿山顺层岩质边坡在爆破扰动下的稳定性,通过采用室内岩石力学试验、爆破振动监测法以及数值分析法对该矿山两种爆破条件对顺层边坡的扰动进行了全面的研究。研究结果显示,在两种爆破条件下,顺层边坡结构面处的位移均呈现出由上至下逐渐增加的趋势,且超过结构面一半时,位移显著增加,且当主爆区爆破时,在爆破扰动下,边坡的安全系数为1.66;当预裂孔爆破时,边坡的安全系数为1.61。说明越靠近顺层边坡的结构面时,边坡的稳定性受爆破的影响越敏感,且在主爆区的频繁爆破扰动下,边坡的稳定性已经受到影响,因此在越靠近结构面的预裂爆破起爆后,边坡的稳定性会降低,但根据安全系数的计算结果可知,不同爆破条件下边坡均处于稳定状态。此项研究为该矿山的设计提供了宝贵的理论依据,为今后矿山的设计、生产均提供了可靠的指导。

High steep bedding rock slope has always been an important research content for domestic and foreign scholars.The stability of high steep bedding rock slope is of great significance for the safety construction of open pit mines.Therefore,this paper studies the stability of the bedding rock slope at the end of an open pit mine,aiming to analyze the stability of the bedding rock slope in the bedding mine under blasting disturbance.Through indoor rock mechanics test,blasting vibration monitoring method and numerical analysis method,this paper conducts a comprehensive study on the disturbance of the bedding rock slope under the two blasting conditions of the mine.The research results show that under the two blasting conditions,the displacement at the structural plane of the bedding slope shows a trend of increasing gradually from top to bottom,and when it exceeds half of the structural plane,the displacement increases significantly,and when the main blasting area is blasted,the safety factor of the slope under blasting disturbance is 1.66.When presplitting blasting,the safety factor of the slope is 1.61.It shows that the closer to the structural plane of bedding slope,the more sensitive the slope stability is to the impact of blasting,and the slope stability has been affected by frequent blasting disturbance in the main blasting area.Therefore,the closer to the structural plane,the more the presplitting blasting initiation is,the lower the slope stability will be.However,according to the calculation results of the safety factor,the slope is stable under different blasting conditions.This research provides valuable theoretical basis for the design of the mine and reliable guidance for future design and production of the mine.