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Abstract Tangshan Mine Y484 goaf water exploration adopted long distance drilling and short distance drilling, overcame soft coal strata collapse hole such as serious difficulties, with long construction period and large working force, long distance goaf water exploration and discharge drilling trajectory deflecting factors were analyzed, geological factor was the objective factor in drilling site, technical factors and technological factors could offset or promote the deflection caused by geologic factors, operating staff technical quality was also the key factor.
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