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中文摘要：
采取有效技术手段进行煤矿采空区调查已成为矿区生态环境治理、矿井安全生产和重大工程建设项目选址中亟需解决的问题。本文以频率域电磁法基本原理为基础,对比分析EH-4电导率成像系统和可控源音频大地电磁法(CSAMT)的方法特点,通过数值模拟探讨不同介质充填采空区的电性响应特征,并结合典型工程实例对EH-4电导率成像系统和可控源音频大地电磁法探测煤矿采空区的实际应用效果进行分析。数值模拟结果和工程实践表明,煤矿采空区相对围岩具有显著的电性差异,以此为物性基础采用频率域电磁法进行采空区探测可以取得较为理想的效果。频率域电磁法在探测煤层采空区方面是一种行之有效的方法,可以成为煤矿防治水和采空区地质灾害调查的有效技术方法。
英文摘要：
Detecting coal mined?out areas with effective measures has been major issue to be addressed in mining area environment management, mine safe production and major construction projects site selection. Based on the fundamental principle of frequency do?main electromagnetic method (FDEM), method characteristics of EH?4 and CSAMT was compared and analyzed, electrical character?istic of mined?out area filled with different materials was analyzed through numerical modeling, and practical detecting effect was dis?cussed by typical project cases of EH?4 and CSAMT. Numerical modeling result and engineering practice prove that compared with sur?rounding rock mined?out area has prominent electrical difference, and base on this physical property mined?out area detecting with FDEM can obtain ideal effect. FDEM is an effective method in detecting coal mined?out area and it has already been an effective tech?nological means in coal mine water prevention and control and geological disaster survey of mined?out area.
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North China Lower Coal Surrounding Rock Failure Characteristics Study Based on FLAC3D and Fiber Brag
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