超大断面硬岩巷道光面爆破技术研究

发布时间：2018-03-07 21:11

本文选题：超大断面　切入点：复式楔形　出处：《金属矿山》2017年08期 　论文类型：期刊论文

【摘要】：为满足地下水封石油洞库工程的特殊要求及解决爆破开挖存在的诸多问题,结合前期施工经验,在理论分析与工程类比的基础上设计了中深孔全断面一次光面爆破技术,采用3.7~3.9 m的中深炮孔,三级复式楔形掏槽,崩落孔分层爆破,周边孔光面爆破,毫秒延迟起爆。现场试验表明,炮孔利用率高达90%,破碎块度适中,周边眼半孔率约为80%,超挖量控制在15 cm以内,巷道成型良好,围岩损伤小,开挖质量很好地满足了施工要求,为超大断面硬岩巷道全断面爆破开挖找到了高效可行的光面爆破方案。复式楔形掏槽技术能够获得理想的掏槽效果,为后续爆破创造了自由面及岩石碎胀空间。同时,该光面爆破技术可为其他类似的硬岩大断面、超大断面地下工程提供借鉴与参考,促进大断面硬岩巷道掘进爆破工艺水平的发展与提升。
[Abstract]:In order to meet the special requirements of underground water sealing oil reservoir and to solve many problems existing in blasting excavation, combined with the previous construction experience, based on theoretical analysis and engineering analogies, the primary smooth blasting technology for the whole section of medium and deep hole is designed. In this paper, the medium and deep gunhole with 3.7m 3.9m, three-stage compound wedge cutting, layered blasting of caving hole, smooth blasting of peripheral hole, millisecond delay blasting are adopted. Field test shows that the utilization ratio of the hole is as high as 90% and the degree of fragmentation is moderate. The half-hole rate of the peripheral eye is about 80, the overdigging amount is controlled within 15 cm, the roadway is well formed, the surrounding rock damage is small, and the excavation quality meets the construction requirements very well. In this paper, an efficient and feasible smooth blasting scheme is found for the full-section blasting excavation of super-large section hard rock roadway. The double wedge cutting technology can obtain ideal cutting effect and create free surface and rock dilatation space for subsequent blasting. At the same time, The smooth blasting technology can provide reference and reference for other similar hard rock large section and large section underground engineering, and promote the development and upgrading of blasting technology level of large section hard rock roadway.
【作者单位】：东北大学资源与土木工程学院;广东锡源爆破工程有限公司;
【基金】：国家自然科学基金项目(编号:51474049,51674062) 辽宁省自然科学基金项目(编号:2014020040)
【分类号】：TD235.374

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