满轲, 刘晓丽. 周边空孔效应对爆破振速及围岩损伤的影响研究[J]. 工程力学, 2020, 37(11): 127-134. DOI: 10.6052/j.issn.1000-4750.2019.12.0790
引用本文: 满轲, 刘晓丽. 周边空孔效应对爆破振速及围岩损伤的影响研究[J]. 工程力学, 2020, 37(11): 127-134. DOI: 10.6052/j.issn.1000-4750.2019.12.0790
MAN Ke, LIU Xiao-li. THE EFFECT OF SURROUNDING EMPTY HOLES ON THE BLASTING VELOCITY AND DAMAGED ZONES[J]. Engineering Mechanics, 2020, 37(11): 127-134. DOI: 10.6052/j.issn.1000-4750.2019.12.0790
Citation: MAN Ke, LIU Xiao-li. THE EFFECT OF SURROUNDING EMPTY HOLES ON THE BLASTING VELOCITY AND DAMAGED ZONES[J]. Engineering Mechanics, 2020, 37(11): 127-134. DOI: 10.6052/j.issn.1000-4750.2019.12.0790

周边空孔效应对爆破振速及围岩损伤的影响研究

THE EFFECT OF SURROUNDING EMPTY HOLES ON THE BLASTING VELOCITY AND DAMAGED ZONES

  • 摘要: 基于光面爆破施工方法,设计了甘肃北山坑探设施项目光面爆破施工的爆破参数,研究了周边孔在空孔间隔情况下的炮眼布置方案。进而,从爆破原理出发,对装药孔与空孔之间的相互爆破作用进行了分析计算,认为在应力集中区与破裂区相互重合状态下的空孔间距是最适宜的间距,通过计算获得其间距值约为30 cm。进一步的实施了在空孔间隔布设周边孔情况下的光面爆破试验,根据爆破后的炮孔利用率及半孔率,发现在采用空孔间隔的左帮位置处,光面爆破效果良好,验证了通过上述方法计算得到的空孔间距是合理的。同时,对爆破过程中和爆破后分别实施了爆破振动监测及围岩损伤测试,爆破振动测试结果显示:空孔间隔侧的最大振速(12 cm/s)小于普通药包侧的最大振速(20 cm/s)。围岩损伤测试结果表明:空孔间隔装药处爆破导致的围岩损伤范围(22 cm)也较普通药包处小(27 cm)。需指出的是,钻爆施工涵盖多种不同的爆破参数,影响因素众多,该文爆破试验获取的爆破数据仅仅是对周边孔布设空孔时产生空孔效应的初步探索,该研究可对后续工程开挖提供相应的试验数据与理论支撑,其对于深部地下工程的爆破开挖及高放废物的深地质处置,有一定的理论指导意义。

     

    Abstract: The blasting parameters of the Beishan Exploration Tunnel were designed based on the smooth blasting method. The smooth blasting which was influenced by the empty holes was studied in detail. From the blasting theory and the stress intensification principle, the distance of the surrounding empty holes was calculated to be 30 cm. Blasting was conducted under surrounding holes with empty holes to verify the calculated value. According to the hole utilization and the half hole ratio after blasting, the empty hole setting was considered to be more suitable. Moreover, the blasting vibration monitoring and the excavation damaged zone (EDZ) detection were separately approved. From the blasting vibration monitoring, the maximum blasting velocity of the empty hole setting cycle (12 cm/s) was much lower than that of the usual cycle (20 cm/s). From the EDZ detection, the damaged area of the empty hole setting side (22 cm) was also lower than that of the other side (27 cm). The blasting method includes many blasting parameters that interact with each other. The above blasting parameters were obtained for the empty hole effect of the surrounding hole. The results and the theoretical knowledge could be applied to the blasting and excavation of the deep geo-engineering and the HLW geo-disposal.

     

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