Abstract

To combat the uncertainty of the multiple factors affecting roadway surrounding rock stability, five initial indexes are selected for reduction according to concept lattice theory: rock quality designation (RQD), uniaxial compressive strength (Rc), the integrity coefficient of rock mass, groundwater seepage, and joint condition. The aim of this study is to compute correlation coefficients among various indexes and verify the effectiveness of lattice reduction. Alpha stable distribution is used to replace the commonly used Gauss distribution in probabilistic neural networks. A prediction model for the stability of roadway surrounding rock is then established based on a concept lattice and improved probabilistic neural network. 100 groups of training sample data are plugged into this model one by one to examine its rationality. The established model is employed for engineering application prediction with ten indiscriminate sample groups from the Jianlinshan mining area of the Daye iron mine, revealing accuracy of up to 90%. This demonstrates that our prediction model based on a concept lattice and improved probabilistic neural network has high reliability and applicability.

Highlights

  • With the gradual improvement in global economic development, the prices of mineral products have increased markedly whilst ore demand has remained stable

  • Mineral resources stored in shallow areas have been declining

  • The stability of the roadway surrounding rock is closely related to mine safety and efficient production [6]

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Summary

Introduction

With the gradual improvement in global economic development, the prices of mineral products have increased markedly whilst ore demand has remained stable. The consumption of mineral resources has forced people to mine deeper underground, where high ground stress, high karst water pressure, and high ground temperatures are more apparent. Mining underground involves frequent disasters, including rock bursts, water inrush, roof cave-ins, surface collapse, and roadway deformation or collapse [2,3,4,5]. The stability of the roadway surrounding rock is closely related to mine safety and efficient production [6]. Though rock bolts have been often used to increase structural stability [7,8,9], data show that the deformation, cave-in, and collapse of mine roadways occur frequently in China; in the last

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