根据七台河矿区具体情况，对各种条件下的防水煤岩柱的留设原则及计算方法进行论述。
Based on the state of Qitaihe mine area, approaches the set rules and calculation methods of water_proof pillar at different conditions.
该研究表明，在富水性较强的古河道发育位置，要合理留设防水煤岩柱，才能保证煤矿安全生产。
Through above research, in the old river channel where water-abundance is good, the pillar must be suitably left for the safe of mining.
该研究表明，在富水性较强的古河道发育位置，要合理留设防水煤岩柱，才能保证煤矿安全生产。
Through above research, in the old river channel where water-abundance is good, the pillar must be suitably left for the safe of mining.
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