Longwall mining has existed in Utah for more than half a century. Much of this mining occurred at depths of cover that significantly exceed those encountered by most other US longwall operations. Deep cover causes high ground stress, which can combine with geology to create a coal burst hazard. Nearly every longwall mine operating within the Utah’s Book Cliffs coalfield has been affected by coal bursts. Pillar design has been a key component in the burst control strategies employed by mines in the Book Cliffs. Historically, most longwall mines employed double-use two-entry yield pillar gates. Double-use signifies that the gate system serves first as the headgate, and then later serves as the tailgate for the adjacent panel. After the 1996 burst fatality at the Aberdeen Mine, the inter-panel barrier design was introduced. In this layout, a wide barrier pillar protects each longwall panel from the previously mined panel, and each gate system is used just once. This paper documents the deep cover longwall mining conducted with each type of pillar design, together with the associated coal burst experience. Each of the six longwall mining complexes in the Book Cliffs having a coal burst history is described on a panel-by-panel basis. The analysis shows that where the mining depth exceeded 450 m, each design has been employed for about 38000 total m of longwall panel extraction. The double-use yield pillar design has been used primarily at depths less than 600 m, however, while the inter-panel barrier design has been used mainly at depths exceeding 600 m. Despite its greater depth of use, the inter-panel barrier gate design has been associated with about one-third as much face region burst activity as the double-use yield pillar design.

长壁开采在犹他州已经存在了半个多世纪。这种开采的大部分发生在覆盖深度，大大超过了美国其他大多数长壁开采作业所遇到的深度。深层覆盖会导致较高的地面应力，而地面应力又可能与地质现象结合在一起，造成煤爆危险。犹他州Book Cliffs煤田内几乎所有经营的长壁煤矿都受到煤爆的影响。立柱设计一直是Book Cliffs矿山采用的爆破控制策略的关键组成部分。从历史上看，大多数长壁矿山都使用两用两入口屈服式闸门。重复使用表示该门系统首先用作顶板，然后用作相邻面板的后板。1996年在阿伯丁矿山炸死后，采用了面板间屏障设计。在这种布局中 宽阔的防护柱保护每个长壁面板免受先前开采的面板的侵害，每个门系统仅使用一次。本文记录了采用每种支柱设计进行的深层长壁开采，以及相关的压煤经验。具有逐壁爆裂历史的《断崖》中的六个长壁开采综合体中的每一个均以逐个面板的形式进行描述。分析表明，在采矿深度超过450 m的情况下，每种设计均采用了总计约38000 m的长壁板开采。双重使用的屈服支柱设计主要用于小于600 m的深度，但是面板间屏障设计主要用于超过600 m的深度。尽管使用深度更大，