Tomographic Imaging of Rock Conditions Ahead of Mining Using the Shearer as a Seismic Source—A Feasibility Study
Tomographic Imaging of Rock Conditions Ahead of Mining Using the Shearer as a Seismic Source—A Feasibility Study
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DOI：
10.1109/tgrs.2009.2018445
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发表时间：
2009-05
影响因子：
8.2
通讯作者：
Xun Luo;A. King;M. V. D. Werken
中科院分区：
文献类型：
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作者：
Xun Luo;A. King;M. V. D. Werken
由于煤炭长壁面板岩石状况不佳而导致的顶板塌陷可能会威胁矿工的生命并导致矿山生产严重中断。人们需要能够在工作面前方且不中断生产的情况下对长壁煤矿开采中的岩石状况进行成像的技术。开展了可行性研究，研究了连续采煤机（采煤机）产生并由工作面前方部署的检波器阵列记录的地震信号特征，以实现开采前顶板岩层状况的地震层析成像。使用两个地震检波器阵列在煤矿进行了两项实验。实验表明，长壁采煤机可产生强低频 (~ 40 Hz) 地震能量，部署在沿巷道浅井中距工作面 300 m 的地震检波器可以充分检测到这些能量。使用噪声过滤和信号互相关技术，可以可靠地确定与采煤机切割相关的地震到达时间。它证明了在采矿过程中可以使用断层扫描技术绘制工作面前方速度变化的概念。
Roof falls due to poor rock conditions in a coal longwall panel may threaten miner's life and cause significant interruption to mine production. There has been a requirement for technologies that are capable of imaging the rock conditions in longwall coal mining, ahead of the working face and without any interruption to production. A feasibility study was carried out to investigate the characteristics of seismic signals generated by the continuous coal cutter (shearer) and recorded by geophone arrays deployed ahead of the working face, for the purpose of seismic tomographic imaging of roof strata condition before mining. Two experiments were conducted at a coal mine using two arrays of geophones. The experiments have demonstrated that the longwall shearer generates strong and low-frequency ( ~ 40 Hz) seismic energy that can be adequately detected by geophones deployed in shallow boreholes along the roadways as far as 300 m from the face. Using noise filtering and signal cross correlation techniques, the seismic arrival times associated with the shearer cutting can be reliably determined. It has proved the concept that velocity variations ahead of the face can be mapped out using tomographic techniques while mining is in progress.