基于地质雷达的矽卡岩型铜铁矿巷道松动圈研究

金属矿山 ›› 2021, Vol. 50 ›› Issue (03): 46-53.

基于地质雷达的矽卡岩型铜铁矿巷道松动圈研究

于庆磊,蒲江涌,勒治华,褚吉祥,姜兆阳,郜晓龙

1. 东北大学岩石破裂与失稳研究所，辽宁沈阳110819；2. 安徽太平矿业有限公司，安徽淮北235115

出版日期:2021-03-15 发布日期:2021-03-17
基金资助:
“十三五”国家重点研发计划项目（编号：2016YFC0801602）；国家自然科学基金面上项目（编号：52074060）

Study on the Broken Rock Zone of Roadway in Skarn Copper-iron Mine Based on Geological Radar

YU Qinglei,PU Jiangyong,LE Zhihua,CHU Jixiang,JIANG Zhaoyang,GAO Xiaolong

1. Center for Rock Instability and Seismicity Research，Northeastern University，Shenyang 110819，China； 2. Anhui Taiping Mining Co.，Ltd，Huaibei 235115，China

Online:2021-03-15 Published:2021-03-17

摘要/Abstract

摘要： 测量巷道松动圈有助于提高巷道支护设计的针对性和有效性。但对于矽卡岩型金属矿床，常由于变质作用的差异，导致矽卡岩物理力学性质空间变异大、强度低、遇水膨胀，给矽卡岩巷道松动圈的测量带来了很大困难。针对矽卡岩型金属矿床井下巷道松动圈测量存在的问题，以太平矿业矽卡岩型铜铁矿床为例，介绍了采用地质雷达探测巷道围岩松动圈的研究成果，分析了巷道围岩松动圈的分布特征，讨论了不同岩石类型对地质雷达探测巷道松动圈的影响。研究表明：太平矿业井下巷道围岩复杂多变，松动圈厚度差异很大，破碎大理岩巷道松动圈主要在1.75 m范围内，而蚀变闪长岩巷道和矽卡岩巷道松动圈分布宽泛，分别在 1.25~3.25 m和1.75~3.50 m范围内变化；巷道断面尺寸越大，松动圈范围越大；地质雷达探测的精度取决于松动圈内围岩和外部塑性区围岩之间介电常数的差异，围岩性质越差，地质雷达图像显示的巷道松动圈边界越不明显；在锚网喷支护巷道中，金属网片对雷达的电磁波有屏蔽作用，当网片网度较小时，会影响地质雷达的探测结果。上述地质雷达测量巷道围岩松动圈的相关分析成果可为同类地质条件的矿山提供借鉴。

关键词: 地质雷达, 巷道围岩松动圈, 矽卡岩型矿床, 支护设计

Abstract: The determination of broken rock zone of roadway can improve the pertinence and effectiveness of roadway support design. However， for skarn deposit， due to the difference of metamorphism，it results in great spatial variety of skarn physical and mechanical properties. Low strength and swelling in water of skarn rock brings difficulty for the determination of broken rock zone of roadway. Aiming at the problem of underground roadway support in weak skarn deposit， using geological radar to detect the broken rock zone of surrounding rock of roadway was introduced in the skarn copper-iron deposit of Taiping Mine. The distribution characteristics of broken rock zone of surrounding rock mass were analyzed and the influence of rock mass quality on the detected results was discussed.The study results show that the properties of the surrounding rock mass of roadway in Taiping Mine are complicated and the differences of the broken rock zones in the roadway are large. The thickness of broken rock zone of crushed marble roadway is mainly within 1.75 m， while the thickness of broken rock zones of altered diorite roadways and skarn roadways are widely distributed in the range of 1.25~3.25 m and 1.75~3.50 m respectively.The bigger the size of roadway is， the thicker the broken rock zone of roadway. The detecting accuracy of the geological radar for the broken rock zones of surrounding rock mass of roadway depends on the difference in dielectric constant of surrounding rock mass between in the broken rock zone and in the outer plastic zone and the weaker the quality of the rock mass is， the less obvious the border of the broken rock zones of roadway on the radar image is. When detecting the broken rock zone in the roadway supported by bolt-mesh-shotcrete， the metal mesh has a shielding effect on the electromagnetic wave of the radar.When the mesh grid is small enough， it will affect the detection result of the geological radar. This work that using geological radar detects the broken rock zone of surrounding rock mass of roadway provides a reference experience for the mines with similar geological conditions.

Key words: geological radar, broken rock zone of roadway, skarn deposit, support design

于庆磊, 蒲江涌, 勒治华, 褚吉祥, 姜兆阳, 郜晓龙. 基于地质雷达的矽卡岩型铜铁矿巷道松动圈研究[J]. 金属矿山, 2021, 50(03): 46-53.

YU Qinglei, PU Jiangyong, LE Zhihua, CHU Jixiang, JIANG Zhaoyang, GAO Xiaolong. Study on the Broken Rock Zone of Roadway in Skarn Copper-iron Mine Based on Geological Radar[J]. Metal Mine, 2021, 50(03): 46-53.

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