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为了探明地下水文情况,提出在倾角为20°—30°近似水平钻孔中用钻粒钻进,在7—9级的岩层中,进尺154.99米,其中钢粒钻进占115.7米,台月效率为174米,小时效率为0.79米,平均矿心采取率为90.9%,涌水量超过放水要求。实践证明:在坚硬岩层打缓倾角钻孔,完全可以用钢粒钻进。这样,不仅解决了我队放水试验工作,且不用建筑大型水闸,改用多孔小水闸,既为国家节豹10万元以上的投资,又
In order to ascertain the hydrology of the groundwater, it is proposed that the drilling be drilled in a horizontal hole with an inclination of about 20 ° -30 °. In the rock formations of class 7-9, the footage is 154.99 meters, of which 115.7 meters of steel grain are drilled. Efficiency of 174 meters, hourly efficiency of 0.79 meters, the average mining rate of 90.9%, gushing water discharge requirements. Practice has proved that: slow down the angle of drilling in hard rock, drilling can be completely used steel. In this way, not only solved our team water test, and without the construction of large sluice, switch to porous small sluice, not only for the national festival Leopard 100,000 yuan investment, and