Study on Shape Characteristics of Plastic Zone in Heterogeneous Roadway-Surrounding Rock

Jun Li, Zheng Wu, Wenlong Zhang, Nianjie Ma and Shuying Guo
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Jun Li: School of Energy & Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Zheng Wu: School of Energy & Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Wenlong Zhang: School of Energy & Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Nianjie Ma: School of Energy & Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Shuying Guo: School of Computer Science, North China Institute of Science and Technology, Langfang 065201, China

Sustainability, 2022, vol. 14, issue 15, 1-18

Abstract: Aiming at the surrounding rock failure of heterogeneous and unequal pressure circular roadways, the approximate analytical algorithm of the plastic zone is proposed. Through the comparison of analytical calculations and numerical simulation, the shape characteristics and evolution law of the surrounding rock’s plastic zone are studied, and the relative error of the two calculation methods is analyzed. The results show the following: (1) With an increase or decrease in the lateral pressure coefficient, the shape of the plastic zone of the roadway-surrounding rock presents a circular-ellipse-butterfly shape change law, and the outer edge of the plastic zone presents a scattered shape, without a continuous boundary. (2) In the butterfly-shaped plastic zone, the butterfly leaf always lies between the maximum confining pressure and the minimum confining pressure and rotates with the pressure. (3) There is a certain amount of error between the maximum value of the plastic zone solved by an analytical algorithm and numerical simulation, and the relative error is positively related to the burial depth and lateral pressure coefficient of the roadway and negatively related to the strength of the surrounding rock. (4) In addition, the relative error of the plastic zone calculation of the multi-layer heterogeneous combination roadway is larger than that of the single heterogeneous roadway.

Keywords: mining roadway; shape characteristics of plastic zone; heterogeneous surrounding rock; error analysis (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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