孔间电阻率监测在注浆效果检测的应用研究

王程; 李博凡; 吴璋; 鲁晶津

doi:10.13272/j.issn.1671-251x.2022110089

孔间电阻率监测在注浆效果检测的应用研究

doi: 10.13272/j.issn.1671-251x.2022110089

中煤科工西安研究院（集团）有限公司，陕西西安　710077

基金项目: 陕西省自然科学基础研究计划（面上）项目（2023-JC-YB-271）；天地科技股份有限公司科技创新创业资金专项资助项目（2020-TD-QN11）。

详细信息

作者简介:
王程（1986—），男，湖北荆州人，副研究员，研究方向为电磁法勘探，E-mail：wangchen@cctegxian.com

中图分类号: TD265
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出版历程
- 收稿日期: 2022-11-24
- 修回日期: 2023-10-18
- 网络出版日期: 2023-10-23

Research on the application of inter hole resistivity monitoring in grouting effect detection

CCTEG Xi'an Research Institute(Group) Co., Ltd., Xi'an 710077, China

摘要

摘要: 华北型煤田煤层底板岩溶水害防治的主要技术手段是对含水岩层进行注浆改造，目前注浆效果检测的手段主要是对注浆前后岩性特征进行分析，缺少对注浆全过程的跟踪动态监测，很难对注浆效果进行准确评价。针对上述问题，引入孔间电阻率监测系统对注浆改造岩层的电阻率变化特征进行全过程监测，以实现浆液扩散范围的精准探测。首先，采用改进电极和线缆装置将电阻率监测系统置于煤层底板长定向钻孔内，实现孔间的电阻率监测；然后，构建浆液扩散的地质模型，采用三维电阻率反演对模拟数据进行处理解释；最后，在煤矿井下注浆层位开展注浆全过程的孔间电阻率监测工程试验。模拟结果表明：孔间电阻率监测能识别浆液异常的扩散范围，根据电阻率随时间的变化趋势可推测浆液扩散范围，随着浆液逐渐扩散，异常区范围逐渐变大，异常强度逐渐增强。工程试验结果表明：通过钻孔将电阻率监测系统布置于注浆层位进行动态监测，监测数据经三维反演成像后能成功捕捉到浆液扩散导致的注浆层位电阻率变化特征，为煤矿注浆效果检测提供一种可行的技术方案。
- 煤层底板长定向孔 /
- 孔间电阻率监测 /
- 超前区域注浆改造 /
- 注浆效果检测 /
- 浆液扩散 /
- 电阻率三维反演
Abstract: The main technical means for preventing and controlling karst water damage in the coal seam floor of North China type coal fields are grouting transformation of the water-bearing rock layer. Currently, the main method for testing the grouting effect is to analyze the lithological features before and after grouting. There is a lack of tracking and dynamic monitoring of the entire grouting process, making it difficult to accurately evaluate the grouting effect. In order to solve the above problems, an inter hole resistivity monitoring system is introduced to monitor the entire process of resistivity changes in grouting transformed rock layers, in order to achieve precise detection of the slurry diffusion range. Firstly, an improved electrode and cable device is used to place the resistivity monitoring system in a long directional borehole on the coal seam floor, achieving resistivity monitoring between boreholes. Secondly, a geological model of slurry diffusion is constructed, and the simulated data is processed and interpreted using three-dimensional resistivity inversion. Finally, engineering tests are conducted on the inter hole resistivity monitoring of the entire grouting process at the injection layer underground in the coal mine. The simulation results indicate that inter hole resistivity monitoring can identify the diffusion range of slurry anomalies. Based on the trend of resistivity changes over time, the diffusion range of slurry can be inferred. As the slurry gradually diffuses, the range of anomalous areas gradually increases and the intensity of anomalies gradually increases. The engineering test results show that the resistivity monitoring system is arranged on the grouting layer through drilling for dynamic monitoring. After three-dimensional inversion imaging of the monitoring data, the features of resistivity changes in the grouting layer caused by slurry diffusion can be successfully captured. It provides a feasible technical solution for detecting the grouting effect in coal mines.
- long directional holes in the coal seam floor /
- monitoring of inter hole resistivity /
- advance area grouting transformation /
- grouting effect testing /
- slurry diffusion /
- three-dimensional resistivity inversion

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图 1 工作面电阻率监测系统结构

Figure 1. Working face resistivity monitoring system architecture

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图 2 孔中线缆电极布置

Figure 2. Cable electrode layout in the hole

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图 3 注浆工程电阻率监测模型

Figure 3. Resistivity monitoring model of grouting engineering

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图 4 浆液扩散范围的孔间电阻率监测反演成像

Figure 4. Inter hole resistivity monitoring for slurry diffusion range inversion imaging

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图 5 定向钻孔及孔间电阻率监测布置

Figure 5. Directional holes and inter hole resistivity monitoring layout

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图 6 底板下30 m层位电阻率监测反演成像

Figure 6. Inverse imaging of resistivity monitoring at 30 m horizon under the floor

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