减震沟减震的数值模拟
|
摘要
减震沟是降低爆破地震效应的重要措施. 通过数值模拟,比较了有无减震沟时的峰值震速分布和开挖面与减震沟距离变化时质点的峰值震速衰减规律,对比分析了不同深度、不同宽度减震沟的减震效果以及减震沟与炮孔相对深度不同时的减震效果. 结果表明:开挖面距离减震沟越近,减震效果越好;在保护区侧,减震沟附近,由于减震沟的屏蔽作用,存在一个震速很小的区域;减震沟的减震效果随减震沟深度的增加而增加,而减震沟的宽度变化对减震意义不大.
Damping ditch is an important measure to reduce the blasting vibration effect. Based on the numerical simulation, peak particle velocities (PPVs) are compared between two cases with a damping ditch and without damping ditch; the attenuation law of PPV is analyzed for different distances between blasting points and damping ditches. Damping effects are compared and analyzed for different depths or different widths of damping ditch and different relative depths between the damping ditch and the blasting hole. The result indicates: the more close to damping ditch excavation face is, the better the damping effect is; on the side of protection zone, near the damping ditch, there is a zone that its vibration velocity is little because of the shield effect of damping ditch; damping effect increases with increase of depth of the damping ditch, but the width of the damping ditch does not quite change the damping effect correctly.
Damping ditch is an important measure to reduce the blasting vibration effect. Based on the numerical simulation, peak particle velocities (PPVs) are compared between two cases with a damping ditch and without damping ditch; the attenuation law of PPV is analyzed for different distances between blasting points and damping ditches. Damping effects are compared and analyzed for different depths or different widths of damping ditch and different relative depths between the damping ditch and the blasting hole. The result indicates: the more close to damping ditch excavation face is, the better the damping effect is; on the side of protection zone, near the damping ditch, there is a zone that its vibration velocity is little because of the shield effect of damping ditch; damping effect increases with increase of depth of the damping ditch, but the width of the damping ditch does not quite change the damping effect correctly.
引文
[1] 高善堂.临近民房的爆破减震技术[J].工程爆破,1996,2(1):7881.
[2] 方 向.高振儒,龙 源,等.减震沟对爆破震动减震效果的实验研究[J].工程爆破,2002,8(4):2023.
[3] 郭学彬,肖正学,张志呈,等.爆破地震作用的沟槽效应[J].爆破器材,1999,28(3):47.
[4] 陆 文,郭学彬.爆破地震效应中的沟槽减震作用研究[J].矿业安全与环保,2001,28(1):1112.
[5] 税承慧.边坡预裂爆破中的减震措施[J].采矿技术,2003,3(1):5860.
[6] 张树堂,李茂林,傅盛国.大连三道沟山体预裂爆破降震效果[J].东北地震研究,1997,13(1):5963.
[7] 谢永生.预裂爆破技术在边坡保护中的应用[J].冶金矿山设计与建设,1999,31(5):2022.
[8] 张新民,舒大强.预裂爆破震动规律的试验研究[J],爆破,2001,18(3):1820.
[2] 方 向.高振儒,龙 源,等.减震沟对爆破震动减震效果的实验研究[J].工程爆破,2002,8(4):2023.
[3] 郭学彬,肖正学,张志呈,等.爆破地震作用的沟槽效应[J].爆破器材,1999,28(3):47.
[4] 陆 文,郭学彬.爆破地震效应中的沟槽减震作用研究[J].矿业安全与环保,2001,28(1):1112.
[5] 税承慧.边坡预裂爆破中的减震措施[J].采矿技术,2003,3(1):5860.
[6] 张树堂,李茂林,傅盛国.大连三道沟山体预裂爆破降震效果[J].东北地震研究,1997,13(1):5963.
[7] 谢永生.预裂爆破技术在边坡保护中的应用[J].冶金矿山设计与建设,1999,31(5):2022.
[8] 张新民,舒大强.预裂爆破震动规律的试验研究[J],爆破,2001,18(3):1820.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心