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Research and Application of Shaft Excavation by Deep Hole One-Time Blasting Technology

机译：深孔一次爆破开挖竖井技术研究与应用

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摘要

In the construction of subway, tunnel, mining and other underground projects, in order to speed up the construction progress, it is often necessary to excavate a shaft first and then dig at both ends of tunnel at the same time. The shaft excavation is a difficult problem in underground engineering. At present, the shaft excavation construction mainly adopts upward construction method and downward construction method, which are characterized by high labor intensity, high risk coefficient and slow construction speed. In order to realize the efficient excavation of vertical shafts, this paper presents a technology of deep hole one-time blasting into wells. Based on theoretical analysis and practical shaft engineering, the blasting parameters of the deep hole one-time blasting technology are given, such as hole diameter, spacing, layout, charge structure and blasting sequence of each hole, and the technical scheme is formed finally. The technology is applied in a shaft excavation construction in Changping District, Beijing of China and good results are obtained, which proves that the technique is feasible.
机译：在地铁，隧道，矿山等地下工程建设中，为了加快施工进度，经常需要先开挖竖井，然后在隧道的两端同时挖。竖井开挖是地下工程中的难题。目前，竖井开挖施工主要采用向上施工法和向下施工法，具有劳动强度大，风险系数高，施工速度慢的特点。为了实现竖井的有效开挖，本文提出了一种深孔一次性爆破技术。在理论分析和实际井筒工程的基础上，给出了深孔一次性喷砂技术的爆破参数，包括各孔的孔径，间距，布局，装药结构和爆破顺序，最终形成了技术方案。该技术在北京昌平区的竖井开挖施工中得到了应用，取得了良好的效果，证明了该技术的可行性。

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