College of Energy and Mining Engineering, Shandong University of Science and Technology
Shandong Energy Group Luxi Mining Co., Ltd.
Shandong Tangkou Coal Co., Ltd.

钻屑法是煤矿常用的冲击地压危险性检测方法，钻孔煤粉量的高效准确采集是工程现场比较关注的技术难点，直接影响检测评价效率和结果。基于钻孔排粉特征及流体质量称重原理，自主研发了一套适用于不同孔径钻孔的煤粉量自动测量装置，该装置由集粉装置、称重装置、数据处理系统和固定机构组成，可根据钻孔排出煤粉的流动质量及标定函数获得煤粉实际质量，通过室内试验和现场测试，检验了该方法的测量准确性。研究表明：根据煤粉流动质量–时间曲线可以有效辨识钻杆钻进及接杆工序；每米钻孔的煤粉流动质量累加值与实际质量呈明显的线性关系，标定函数与称重装置的称重滑道倾角、采样频率等装置测试参数相关；与常规称重法相比，煤粉自动测量方法的实验室测量误差最大值小于6.5%，现场测试平均误差为5.13%，误差小于10%的数据占比86.91%，装置测试参数和钻孔煤粉流量、粒径等不可控的工程因素对测量结果准确性影响很小；在保证准确性的同时，常规孔径钻屑法的接杆工序时长减少了25.16%，施工效率提升了11.84%。大直径钻孔浅部煤粉分布规律与常规孔径钻屑法一致，同时可获得更深处巷帮煤粉量分布。所提出的煤粉自动测量方法，提高了大直径钻孔钻屑法的施工操作性，可实现大直径钻孔的强排粉卸压–煤粉测量同步作业。

Drilling-cutting method is a commonly used coal bump risk detection method in coal seams. The efficient and accurate acquisition of the quality of drilling-cuttings is a technical difficulty in engineering site, which could directly affect the risk detection efficiency and results. Based on the discharging characteristics of drilling-cuttings and the principle of fluid quality weighing, an automatic measuring device for drilling-cuttings suitable for different diameter boreholes is developed. This device consists of cuttings collecting unit, weighing unit, data processing system and fixing unit. It can measure the quality of the drilling-cuttings according to the flow-quality of drilling-cuttings discharged from the borehole and the calibration function. The measurement accuracy of this method is verified by laboratory test and field test. Research shows that the drilling process and drilling pipe installation process can be easily identified based on the drilling cuttings’ flow quality – time curve. The accumulated flow-quality of drilling-cuttings per meter has positive linear correlation with its actual quality, and the calibration function is related to the device measurement parameters, such as the dip angel of the weighing slideway and the sampling frequency. Compared with the conventional weighing method, when measuring the drilling-cuttings by using the automatic measurement device, the maximum measurement error of the laboratory test is less than 6.5%, and the average error of the field test is 5.13%, while the data with error less than 10% account for 86.91%. The device measure parameters and the engineering factors, such as drilling-cuttings flow velocity and particle size, have little effect on the measurement accuracy. In the construction of conventional-diameter drilling-cutting borehole, the drilling pipe installation process time is reduced by 25.16%, and the construction efficiency is increased by 11.84%. The distribution law of drilling-cuttings in the shallow part of the large-diameter destressing borehole is consistent with that of the conventional-diameter drilling-cutting borehole, and the distribution of drilling-cuttings in deeper roadway side can be obtained. The proposed automatic measurement method of drilling-cuttings can improve the construction operability of large-diameter drilling-cutting method, and can realize the synchronous operation of pressure relief and drilling-cuttings measurement.

山东省自然科学基金重大基础研究资助项目(ZR2019ZD13)；国家自然科学基金资助项目(52074167)；泰山学者工程专项经费资助项目(tstp20221126)

尹延春，郑武威，赵同彬，等. 煤层钻孔钻进煤粉自动测量方法及试验研究[J]. 煤炭科学技术，2023，51（11）：23−32.

YIN Yanchun，ZHENG Wuwei，ZHAO Tongbin，et al. Automatic measurement method of drilling-cuttings of boreholes in the coal seam and test study[J]. Coal Science and Technology，2023，51（11）：23−32.