岩质边坡爆破振动速度高程效应  

Altitude effect of blasting vibration velocity in rock slopes

作　　者：蒋楠[1] 周传波[1] 平雯[1] 徐星[1] 路世伟 

机构地区：[1]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《中南大学学报（自然科学版）》2014年第1期237-243,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(41072219;41372312);中央高校基本科研业务费专项资金资助项目(CUGL140817)

摘　　要：基于量纲分析理论,分析影响边坡爆破振动速度相关物理量,推导改进考虑高程影响的爆破振动速度衰减经验公式。结合大冶铁矿东露天采场狮子山北帮边坡挂帮矿开采工程实际,建立简化模型计算分析并通过现场实测数据进行验证。采用已验证模型及参数,分别建立不同坡度边坡(坡角依次为15°,30°,45°和60°)爆破振动数值模型模拟计算,研究高程效应对爆破振动速度衰减的影响。计算分析结果表明:对于同一边坡坡体内同一水平监测点,高程作用对边坡振动速度的放大效应明显,并主要以垂直方向振动速度放大为主;对于同一边坡坡面监测点,随着水平距离、高程差的增大,爆破振动速度以衰减趋势为主导,放大效应不够明显;对于不同坡度边坡,在同一水平处各坡面监测点爆破振动速度随着边坡坡度增加以衰减为主,但存在高程放大效应占主导的现象;对比分析结果说明基于量纲分析改进的经验公式能够对边坡爆破振动速度高程的影响进行更好地修正。Based on dimensional analysis theory and analysis of related physical quantities affected slope blasting vibration velocity, the empirical formula of the PPV attenuation law which considered height influence was derived and improved. With Shizhi Hill north wall slope hang-wall-ore mining project in Daye iron ore east open pit, the simplified numerical model was established and calculated. The analysis results were proved by field blasting tests. The different degree slopes which contains 15° slope, 30° slope, 45° slope and 60° slope were established by applying the proved model and parameters. The impact of altitude effect on PPV attenuation was studied by numerical simulation. The simulation results indicate that the PPVs of monitoring points which are at the same level in the identical slope body are amplified under the altitude influence, and the amplification of vertical PPV plays the main role. The PPVs of monitoring points which are on the identical slope surface attenuate with the horizontal distance and altitude increase, and the amplification effect is not obvious. The PPVs of monitoring points which are at the same level on the different slope surface attenuate with the increase of the slope degree, but there is a phenomenon that the amplification effect plays the main role. The contrastive analysis shows that the empirical formula improved by dimensional analysis theory can correct the impact of altitude effect on PPV.

关 键 词：岩质边坡 爆破振动 高程效应 量纲分析 数值模拟 

分 类 号：TU459[建筑科学—岩土工程]