高寒地区矿山爆破振动对边坡的响应特征分析

    Response characteristics of blasting vibration of mine to slope in alpine zone

    • 摘要: 针对高寒地区爆破振动对边坡响应特征的分析较少。为了研究高寒地区爆破振动衰减规律以及对边坡的响应特征,选取矿区岩石试件分别在-25 ℃和+20 ℃条件下进行了岩石波阻抗的测试试验;在不同温度下分别对边坡展开了爆破振动监测试验,进而基于数值模拟手段,对比分析了边坡在不同温度下的响应特征。研究结果表明,-25 ℃条件下的岩石试件波阻抗增大了28.5%;爆破荷载作用下,随着温度的降低,边坡坡底部位的沉降位移呈增加趋势,主要是由于爆破振动衰减速率降低,延长了爆破振动波对边坡的作用时间而造成了位移的增大,研究结果可为后期控制爆破振动对边坡的危害效应提供参考。

       

      Abstract: The response characteristics of blasting vibration to slope in alpine region are seldom analyzed.In order to study the attenuation law of blasting vibration and the response characteristics of slope in alpine region, rock samples in mining area are selected to carry out rock wave impedance test at -25℃ and +20℃, respectively.Blasting vibration monitoring tests are carried out at different temperatures, and then comparative of response characteristics of slope at different temperatures is analyzed based on numerical simulation.The results show that the wave impedance of rock specimens increases by 28.5% at -25℃, and the settlement displacement at the bottom of slope increases with the decrease of temperature under blasting loading, mainly because the attenuation rate of blasting vibration decreases and the action time of seismic wave on slope is prolonged.The research results can provide some guidances for controlling the harmful effect of blasting vibration on slope in the later stage.

       

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