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.
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.
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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