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(2) the existence of dominant driving pathway was tested and the way kept almost fixed. The pathway is apt to exist in the edge of coal samples where pore and fracture fully develop;

(3) the variation of water flow determines the transport velocity of leading edge of water driving and it has lag effect;

(4) the effectiveness of the first driving is better than the second driving;

and (5) the subsequence of water driving gas are from trunk fractures to branch fractures, then to branch pores. Key words Mining engineering;

NMRI;

Coal seam;

Gas-water two-phase;

Water driving gas 通讯作者: 潘一山 panyish_cn@sina.com 作者个人主页: 潘一山1 ;

唐巨鹏1?2 ;

李成全1