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Assessment of Mine Subsidence in an Area with a Major Pillar Crushing Event - Newcastle, Australia

机译：澳大利亚纽卡斯尔纽卡斯尔的一个地区矿井沉降评估

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This paper demonstrates the use of historical and 'new' information to develop a model for pillar strength and subsidence analyses using empirical and numerical methods. The subsidence assessment was for a 4ha (10 ac) multi-storey redevelopment site along Newcastle Harbour. The 6m (20.3ft) thick Borehole Coal Seam was mined using the room and pillar method in the 1880's and 1890's, approximately 70m (230ft) beneath the harbour. The mined height was approximately 5m (16ft) and the pillars were approximately 5.5m (18ft) wide; thus, resulting in marginally stable pillars. Soon after mining was completed in one area in 1896, pillar failure occurred. It probably failed due to the fall of the 1.2m (4ft) thick roof coal layer, which had been left inplace, further increasing the height of the pillars. An approximately 25ha (60 ac) crushed area with up to 1.2m (4ft) of trough subsidence resulted. The workings were not flooded and the colliery closed in 1905 and allowed to flood. The investigation targeted pillars with boreholes to assess their condition and coal thickness. A downhole geophysical survey was also performed to confirm the coal thickness. The amount of crushing was determined by comparing the coal thickness in a borehole in a pillar with the thickness of coal in a borehole in an unmined location. The site is within a Mine Subsidence Board (MSB) district and the MSB is the referral authority for any improvement. In order to gain approval for development, it is necessary-to
机译：本文展示了使用历史和“新”信息，利用经验和数值方法开发柱强度和沉降分析的模型。陷入纽卡斯尔港的4HA（10 AC）多层重建地点。在1880年代和1890年，在港口下方约70米（230英尺）的房间和支柱方法中，采用6M（20.3英尺）厚的钻孔煤层。开采的高度约为5米（16英尺），柱约为5.5米（18英尺）;因此，导致柱状稳定的柱子。在1896年在一个领域完成开采后，发生了Pillar失败。由于1.2米（4英尺）厚的屋顶煤层的下降，它可能失败了，该层厚的屋顶煤层，进一步增加了柱的高度。大约25Ha（60个AC）碎裂区域，高达1.2米（4英尺）的低谷沉降。这些工作没有被淹没，煤矿在1905年结束，允许洪水。调查有针对性柱的钻孔，以评估其病症和煤厚度。还进行了井下地球物理调查以确认煤厚度。通过将柱子中的钻孔中的煤厚度与未在线位置的钻孔中的煤的厚度进行比较来确定粉碎量。该网站位于矿井沉降局（MSB）区，MSB是任何改进的推荐机构。为了获得批准的发展，是必要的

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