通过岩矿的抗压强度和自然矿块破断力力学试验研究，找到了降低粗磨机钢球尺寸的理论依据。

Theoretical reason of reducing ball size of coarse grinding has been found through tests on compressive strength of rock and rupture stress of natural ore lump.

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通过井下实例进行了锚杆预紧力控制的试验，锚杆破断现象基本消失，取得了很好的支护效果。

With the underground mine cases, a test of the bolt pre-tension control was conducted and the bolt broken phenomenon was basically eliminated with excellent effect.

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