岩巷掘进准直眼掏槽爆破模型试验研究

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Abstract In order to better apply the technique of quasi-parallel cutting blast，based on similarity theory，the similarity criterion of model test of quasi-parallel cutting is established. The physical model tests of quasi-parallel cutting are carried out. Taking the face spacing，array pitch and angle of main cut holes as the key factors，the orthogonal tests are conducted. The results of range analysis show that：(1) The face spacing of main cut holes has the maximum effect on cut depth，next is the angle，and the minimum is the array pitch. (2) For cavity volume，the face spacing of main cut holes has the maximum effect，next is the array pitch，and the minimum is the angle. The results of variance analysis show that：(1) The face spacing of main cut holes has a very significant effect on cut depth，the angle has a significant effect on cut depth，while the array pitch has no effect on cut depth. (2) The three factors all have very significant effects on cavity volume. Besides，the model tests are conducted under the condition that the angle of main cut holes is greater than 85°. The test results show that the influence of angle of main cut holes on quasi-parallel cutting blast is very apparent. Meantime，the test results prove the analysis of corner span between quasi-parallel hole and the free face. The optimization blast parameters of model test are obtained as following：the face spacing of main cut holes is 150 mm；the array pitch of holes is 70 mm and the angle of main cut holes is 83°. The good blast effects are achieved by using the transformation scheme from the above scheme in field engineering.

Key words： mining engineering blast engineering rock drivage quasi-parallel cutting model test

Received: 12 July 2011

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https://rockmech.whrsm.ac.cn/EN/Y2012/V31/I2/256

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