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Sains Malaysiana
46(11)(2017): 2019-2028 http://dx.doi.org/10.17576/jsm-2017-4611-01 Study on the Characteristics of
Gas Permeability of Coal under Loaded Stress (Kajian Pencirian
Kebolehtelapan Gas Arang Batu di bawah Beban Tekanan) 1School of Civil Engineering and
Architecture, Wuhan University of Technology, Wuhan, Hubei 430070,
China 2Hubei Key Laboratory of Roadway
Bridge and Structure Engineering, Wuhan University of Technology,
Wuhan Hubei 430070, China 3School of Resources and Environmental
Engineering, Wuhan University of Technology Wuhan
430070, China 4Department of Safety Science &
Engineering, Henan Institute of Engineering, Zhengzhou 451191 China Received:
5 January 2017/Accepted: 20 May 2017 The #3 coal seam of Jinsheng Rundong Ltd. of Jin-Coal
Group in Shanxi Province, China, has high gas content and pressure;
however, it has a low gas permeability, which can easily cause gas
enrichment and may cause accidents of coal and gas outbursts. In
this work, the characteristics of gas seepage were thoroughly studied
by designing and modifying the ‘complete stress-strain tri-axial
servo temperature-controlled test system’. The study was conducted
based on four factors: Axial pressure, confining pressure, effective
stress and gas pressure. We found that the axial pressure has a
weak impact on coal gas permeability, indicated by a linear relationship.
The confining pressure, however, has a strong impact on gas permeability,
showing an exponential relationship. The relationship between permeability
and gas pressure was identified as a second-order polynomial function.
The functional relationship between gas permeability and axial pressure,
confining pressure, effective stress, gas pressure was analyzed.
Investigation into the natural flow rate of gas, concentration of
gas drainage and damping coefficient supported the conclusion from
the experimental study on the characteristics of gas seepage under
loaded stress. Keywords: Field test; gas within coal; load stress; permeability ABSTRAK Lipit arang batu #3 daripada Jinsheng Rundong Ltd.
diperoleh daripada Kumpulan Jin-Coal di Wilayah Shanxi, China mempunyai
kandungan dan tekanan gas yang tinggi; walau bagaimanapun, ia mempunyai
kebolehtelapan gas yang rendah dan dengan mudah boleh menyebabkan
pengayaan gas yang boleh menyebabkan kemalangan arang batu dan letusan
gas. Dalam kajian ini, ciri resapan gas telah dikaji secara teliti
dengan merancang dan mengubah suai ‘sistem pengujian suhu-terkawal
servo tri-paksi tekanan yang lengkap’. Kajian ini dijalankan berdasarkan
empat faktor: Tekanan paksi, tekanan mengekang, tegasan berkesan,
dan tekanan gas. Kami mendapati bahawa tekanan paksi mempunyai kesan
lemah terhadap ketelapan gas arang batu, seperti ditunjukkan pada
hubungan lurus. Walau bagaimanapun, tekanan pengurung mempunyai
kesan yang besar terhadap kebolehtelapan gas, yang menunjukkan hubungan
eksponen. Hubungan antara kebolehtelapan dan tekanan gas dikenal
pasti sebagai fungsi polinomial-tertib kedua. Hubungan fungsi antara
kebolehtelapan gas dan tekanan paksi, tekanan mengekang, tegasan
berkesan dan tekanan gas dianalisis. Kajian kepada kadar aliran
gas semula jadi, kepekatan saliran gas dan pekali redaman menyokong
kesimpulan daripada kajian eksperimen mengenai ciri resapan gas
di bawah beban tekanan. Kata
kunci: Beban tekanan; gas dalam arang batu; kebolehtelapan; ujian
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