| 钻孔多参量指标预测冲击地压危险性的试验研究 |
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| 引用本文： | 郝志勇,王率领,潘一山.钻孔多参量指标预测冲击地压危险性的试验研究[J].煤田地质与勘探,2018,46(6):203-211. |
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| 作者姓名： | 郝志勇 王率领 潘一山 |
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| 基金项目： | 国家自然科学基金项目（51674133）；国家重点研发计划项目（2017YFC0804208） |
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| 摘 要： | 为准确预测预报冲击地压危险性，提出一种通过监测钻孔过程中钻杆推力、钻杆扭矩与钻屑量等钻孔多参量指标变化规律来预测冲击危险性的方法。利用自主研制的钻孔多参量一体化测试装置，在实验环境下对不同煤体应力状态下的多参量指标进行测试分析，发现钻杆扭矩与钻屑量均随着煤体应力的增大而增大，钻杆推力随着钻进时间的增加呈现先增大再减小，并出现波谷随后增大最后减小的规律。在相同钻机及钻具条件下，进行井下原位钻孔试验，结果表明:随着钻进深度增大，钻杆扭矩与钻屑量变化规律呈现较好一致性，在5 m深度前均先增大随后减小；钻杆推力在1~4 m内呈上升趋势，在5 m处下降至波谷位置，随后推力值再次上升，最后呈稳定趋势。对此区域应力分布带情况进行划分，可确定应力峰值点大致在孔深5 m处，并利用SPSS数据分析软件初步确定此试验点钻杆推力临界指标为7.5 kN，钻杆扭矩临界指标为50.0 N·m。研究结果可为冲击地压等煤矿动力灾害危险性的预测预报提供理论基础与工程指导。
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| 关 键 词： | 冲击地压 钻孔多参量指标 煤体应力 临界指标 |
| 收稿时间： | 2018-05-08 |
Experimental study on prediction of rock burst risk by multi-parameter indexes of borehole |
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| Abstract: | In order to accurately predict the danger of rock burst, a method for predicting impact risk by monitoring the variation law of drilling parameters such as drill rod thrust, drill rod torque and drill cutting quantity during drilling was proposed. Using self-developed integrated testing device of multi-parameters of borehole, test and analysis of multi-parameters of different coal stress state under laboratory environment, it was found that the drilling rod torque and drilling cutting quantity increased with the increase of the stress of the coal body. As the drilling time increased, the drilling rod thrust firstly increased and then decreased, showed a trough of wave, and then increased and finally decreased. Under the same drilling and drilling tool conditions, in-situ experiment drilling was carried out in mine. The results indicate that with the increase of drilling depth, the change regulation of drilling rod torque and drilling cutting quantity showed a high degree of consistency, before 5 m depth, all of them first increased and then decreased. The thrust of drilling rod is on the rise in 1-4 m, down to the trough of wave at 5 m, then the thrust value rised again, and finally showed a steady trend. The distribution of stress in this area was divided, it could be determined that the stress peak point was approximately at 5 m deep in the hole. And the SPSS data analysis software was used to preliminarily determine that the critical thrust index of the drill rod of this test point was 7.5 kN, the critical index of drilling rod torque was 50 N·m. The research results can provide theoretical basis and engineering guidance for prediction of coal mine dynamic disaster risk such as rock burst. |
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