Research and application of comprehensive detection methods for geological structural planes in drill and blast tunnels

IF 2.2 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
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Abstract

At present, the detection of geological structural plane that give rise to rockburst is a complex problem. A large number of rockburst cases show that the geological structural plane influence the boundary of rockburst, especially the slip-type rockburst of structural plane. However, there is no set of comprehensive geological prediction methods at home and abroad for the detection of geological structural plane that give rise to rockburst, or low accuracy and high workload. Therefore, a method that can effectively detect geological structural plane is needed. Based on the analysis of regional engineering geological characteristics and geostress, this paper puts forward that based on the characteristics of rockburst cases in high geostress area and the rockburst prone to occur in the position with large geostress difference, the method of “combination of long and short geophysical prospecting method first, drilling and engineering geological analysis combination” is adopted to detect geological structural plane finely. The results show that: (1) Under the background of regional engineering geological survey and geostress inversion, the comprehensive geological prediction is carried out to detect the geological structural plane. The TSP has the detection accuracy of 10 m to meters, the ground penetrating radar has the detection accuracy of meters to decimeters, and the borehole imaging has the observation accuracy of centimeters. The combination of the three can multi-scale clearly reflect the distribution of geological structural plane compared with the previous single geological prediction. (2) Due to the complex distribution of surrounding rock mass interface and geological structural plane, the collapse phenomenon will also appear in the rockburst area on site, and the collapse causes a number of structural plane, which means that these structural plane becomes an important factor in slip-type rockburst of structural plane. In short, accurate detection of geological structural plane has certain reference significance for predicting the boundary of slip-type rockburst of structural plane and collapse.

钻爆隧道地质结构平面综合探测方法的研究与应用
目前,引起岩爆的地质构造面的探测是一个复杂的问题。大量岩爆案例表明,地质构造面影响岩爆边界,尤其是构造面滑移型岩爆。然而,目前国内外还没有一套完整的地质预测方法来检测引发岩爆的地质构造面,或精度低、工作量大。因此,需要一种能够有效探测地质构造面的方法。本文在分析区域工程地质特征和地应力的基础上,根据高地应力地区岩爆案例的特点和地应力差较大位置易发生岩爆的特点,提出采用 "长短结合地球物理勘探方法先行,钻探与工程地质分析相结合 "的方法精细探测地质构造面。结果表明(1)以区域工程地质调查和地应力反演为背景,进行综合地质预测,探测地质构造面。TSP 的探测精度为 10 米至米,探地雷达的探测精度为米至分米,钻孔成像的观测精度为厘米。与以往单一的地质预测相比,三者的结合可以多尺度清晰地反映地质构造面的分布。(2)由于围岩体界面和地质结构面分布复杂,现场岩爆区也会出现崩塌现象,而崩塌又会造成多个结构面,这就意味着这些结构面成为结构面滑移型岩爆的重要因素。总之,地质构造面的准确探测对于预测构造面滑动型岩爆与崩塌的边界具有一定的参考意义。
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来源期刊
Journal of Applied Geophysics
Journal of Applied Geophysics 地学-地球科学综合
CiteScore
3.60
自引率
10.00%
发文量
274
审稿时长
4 months
期刊介绍: The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.
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