Author:
Ma Bailong,Zhang Kai,Xiao Fangyuan,Yu Bosong,Xue Xinran,Jiang Tao,Zhang Houquan,Zhang Zhanrong
Abstract
AbstractGrouting reinforcement is an effective method for controlling fractured rock in the deeply buried roadways of coal mines. However, quantitatively evaluating the strength of grouted rock masses remains a challenge. The design of grouting reinforcement is primarily based on empirical knowledge. Consequently, this study proposes a real-time in-situ method for evaluating grouting quality using measure while drilling (MWD) based on a roofbolter. Initially, we validated the method through a numerical study using the discrete element method. Several 3D rock samples with varying crack densities were established and drilled numerically, demonstrating that the strength of fractured rock masses can be better estimated using the rock drillability index rather than drilling specific energy. Therefore, a model, known as the Pd–Rc model, was established to estimate rock strength based on the rock drillability index. Subsequently, an in-situ validation was conducted using a self-developed MWD testing system to assess the grouting quality in fractured rock masses. The results show that the strength of the rock mass increases by 38%, 56.0%, and 49.7%, respectively, after grouting, as observed in three boreholes. This method allows for quantitative estimation of grouting quality.
Funder
Graduate Innovation Program of China University of Mining and Technology
Postgraduate Research & Practice Innovation Program of Jiangsu Province
National Natural Science Foundation of China
Publisher
Springer Science and Business Media LLC
Subject
Economic Geology,General Energy,Geophysics,Geotechnical Engineering and Engineering Geology
Cited by
2 articles.
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