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李建林,薛 杨,王心义,等. 基于模糊综合评价的导水通道超前探查判识技术[J]. 煤炭科学技术,2024,52(7):178−186. doi: 10.12438/cst.2023-1269
引用本文: 李建林,薛 杨,王心义,等. 基于模糊综合评价的导水通道超前探查判识技术[J]. 煤炭科学技术,2024,52(7):178−186. doi: 10.12438/cst.2023-1269
LI Jianlin,XUE Yang,WANG Xinyi,et al. Judgment technique for over-exploration of water-conducting channel based on process analysis and fuzzy comprehensive evaluation[J]. Coal Science and Technology,2024,52(7):178−186. doi: 10.12438/cst.2023-1269
Citation: LI Jianlin,XUE Yang,WANG Xinyi,et al. Judgment technique for over-exploration of water-conducting channel based on process analysis and fuzzy comprehensive evaluation[J]. Coal Science and Technology,2024,52(7):178−186. doi: 10.12438/cst.2023-1269

基于模糊综合评价的导水通道超前探查判识技术

Judgment technique for over-exploration of water-conducting channel based on process analysis and fuzzy comprehensive evaluation

  • 摘要: 华北型煤田地质条件复杂,煤层底板受构造切割形成大量导水通道,其探查判识一直是水害防治中的重点和难点。以多分支定向长钻孔超前探查为基础,构建了基于流程分析与模糊综合评价相结合的导水通道判识技术。首先在超前探查过程中,选取钻时录井、钻井液消耗量、γ录井、岩屑录井、压水试验、可注性6个评判指标,将施工过程分为16种工况,依此建立综合分析流程图,对样点是否导水进行定性判识;其次采用钻速、钻井液消耗量、γ值、非灰岩占比、单位压注量和注浆量对6个指标进行量化分级,利用超标加权法确定指标权重,基于模糊理论和最大隶属度原则对样点是否导水进行三级定量判识;最后利用该技术对赵固一矿15031工作面13个点位进行综合流程分析和模糊综合评价,其中10个点位导水可能性高,3个点位导水可能性低;在此基础上,结合工程实际成功标定了3条导水通道的具体位置。该技术构建了导水通道的判识指标体系,并对其进行量化分级与综合评估,提高了煤层底板导水通道的判识度。

     

    Abstract: The geological conditions of the North China-type coalfields are complicated, and a large number of water-conducting channels are formed by the tectonic cutting of the coal seam base plate, whose detection and identification have always been the key point and difficulty in water damage prevention and control. Based on the multi-branch directional long drilling overrun investigation, the water-conducting channel identification technology combining process analysis and fuzzy comprehensive evaluation was constructed. Firstly, in the process of overpassing exploration, six evaluation indexes were selected, named drilling time recording, drilling fluid consumption, γ recording, rock chip recording, water pressure test and injectability and the construction process was divided into 16 working conditions, according to which a comprehensive analysis flowchart was set up to make a qualitatively judgement on whether the sample points were water-conducting. Secondly, the six indicators are quantified and graded by drilling speed, drilling fluid consumption, γ value, non-tuff proportion, unit grouting volume, and grouting volume, the weights of the indicators were determined by using the over-weighting method, and a three-level quantitative identification was made based on the fuzzy theory and the maximum membership principle to determine whether the sample point was water-conducting. Lastly, the technique was used to carry out a comprehensive process analysis and fuzzy comprehensive evaluation of 13 points in the 15031 working face of Zhaogu No.1 mine, of which 10 points had a high probability of water conduction and 3 points had a low probability of water conduction. This technique constructed a system of indicators for identifying water-conducting channels, and carried out quantitative grading and comprehensive evaluation, which improved the identification of water-conducting channels in the coalbed base plate.

     

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