When rotation speed is low, factors effecting soil delivering resistance are the soil volume carried by the vane and the spiral angle of drill.

采用两种不同螺旋角钻具对粘土进行输土实验，对比阻力结果证明了理论的正确性。

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The results showed that forest harvesting resulted in increase in soil volume weight, lessening porosity, and decline in function of water holding.

结果表明：森林采伐后土壤容重增大，孔隙度减小，土壤持水性能降低。

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Mainly used in roadway construction, excavation rock and soil volume, opencast working, blom up holes of explosion & pre-intensity, for water conservancy projects.

主要用于道路建设、土石方开挖及露天开采，水利工程爆破孔、预烈孔的凿岩工序，是理想的高效穿凿设备。

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