Drilling operations are extensively used for underground excavation, and their efficiency has a direct impact on project duration and expense. Adjusting the operational parameters during the drilling process is important for improving drilling efficiency. In this study, the sensitivity of drilling efficiency to operational parameters was investigated. Full-scale drilling tests for a dolomite block were conducted using a hydraulic drifter, and the ‘measurement while drilling’ system was used to record the drilling data. Orthogonal schemes were designed to arrange the tests, and the penetration rate, specific energy and rate–energy ratio were regarded as evaluation indices to assess the drilling efficiency. The sensitivity of the evaluation indices to operational parameters was analysed using both range analysis and variance analysis. Results show that the optimal combination of parameters within the test range was determined to be the propelling pressure of 8.5 MPa, percussive pressure of 17.5 MPa and rotary speed of 250 r/min to obtain the maximum drilling efficiency. The sensitivity sequence of the rate–energy ratio was propelling pressure, percussive pressure and rotary speed, with weights of 54.0, 38.7 and 7.3%, respectively. These findings can provide a valuable reference for adjusting the operational parameters of hydraulic drifters to optimise drilling efficiency.

中文翻译：

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钻井效率对凿岩机作业参数的敏感性研究

钻孔作业广泛用于地下开挖，其效率直接影响项目工期和费用。钻井过程中调整作业参数对于提高钻井效率具有重要意义。在这项研究中，研究了钻井效率对操作参数的敏感性。使用液压凿岩机对白云石块体进行了全尺寸钻探试验，并使用“随钻测量”系统记录钻探数据。设计正交方案安排试验，以钻速、比能、速率-能量比作为评价指标，评价钻井效率。采用极差分析和方差分析相结合的方法分析评价指标对运行参数的敏感性。结果表明，在试验范围内确定最佳参数组合为推进压力8.5 MPa、冲击压力17.5 MPa、转速250 r/min，以获得最大钻进效率。速率能量比的敏感性顺序为推进压力、冲击压力和转速，权重分别为54.0%、38.7%和7.3%。这些研究结果可为调整液压凿岩机作业参数、优化钻井效率提供有价值的参考。