基于多因素试验的凿岩参数影响规律研究

Influence law of rock drilling parameters based on multi-factor test

为掌握凿岩棒水下破岩特点,明确深中通道沉管隧道基槽岩石处理凿岩参数,采用多因素正交试验的方式,研究提升高度、凿击次数、排距、位距分别对平均块度、不均匀系数、分形维数以及清礁厚度影响的规律。结果表明,平均块度与提升高度、排距、位距呈正相关,与凿击次数呈负相关;不均匀系数与提升高度、排距、位距呈正相关,与凿击次数呈负相关;分形维数与凿击次数呈正相关,与提升高度、排距、位距呈负相关;清礁厚度与提升高度和凿击次数呈正相关,与排距和位距呈负相关。基于多因素试验结果,凿岩参数设置为凿岩棒提升高度27 m、凿击次数3次、凿岩点排距2.5 m、位距1.7 m,岩石破碎块度适当,清礁难度小,取得较好的施工效果。

To master the underwater rock breaking characteristics of rock drill rod and clarify the rock drilling parameters of foundation trench rock treatment of deep and medium channel immersed tunnel,we apply the multi-factor orthogonal test to study the effects of lifting height,chiseling times,row spacing and bit spacing on average fragmentation,non-uniformity coefficient,fractal dimension and reef clearing thickness.The results show that the average block size is positively correlated with the lifting height,row spacing and bit spacing,and negatively correlated with the number of chisels;The non-uniformity coefficient is positively correlated with lifting height,row spacing and bit spacing,and negatively correlated with chiseling times;The fractal dimension is positively correlated with the number of chiseling,and negatively correlated with the lifting height,row spacing and bit spacing;Reef clearing thickness is positively correlated with lifting height and chiseling times,and negatively correlated with row spacing and bit spacing.Based on the results of multi-factor test and research,the on-site rock drilling parameters are set as follows.the lifting height of rock drilling rod is 27 m,the number of chisels is 3 times,the row spacing of rock drilling points is 2.5 m,the spacing is 1.7 m,thus the rock fragmentation is appropriate and reef cleaning is not difficult.Overall,good construction results are achieved.