Bearing Capacity and Dynamic Reliability of Surrounding Rock and Supporting Structure in Deep Roadway
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ORIGINAL PAPER
Bearing Capacity and Dynamic Reliability of Surrounding Rock and Supporting Structure in Deep Roadway Weijian Yu
. Fang Zhang . Shufu Yao . Bao Pan
Received: 30 March 2020 / Accepted: 29 May 2020 Ó Springer Nature Switzerland AG 2020
Abstract Due to the complexity of the environment in which the high geostress tectonic rock mass is located and the uncertainty of its influencing factors, the mechanical process and stability of the surrounding rock and the supporting structure are not accurate enough. On the basis of rock mechanics, the principle of joint support of ‘‘anchor and anchor’’ is analyzed, and the theory of force transmission bearing system of superimposed arch is proposed. According to the characteristics of surrounding rock of engineering, the mechanical model of superimposed arch bearing body and reliability theory are combined. Comprehensive consideration of influencing factors, establishes the limit equilibrium equation of the equivalent coupled surrounding rock after the secondary support of the chamber of the crushing station. The comparison and verification of the theory is carried out in combination with the project of Jinchuan III mine crushing station. The results show that the failure probability of chamber engineering support in the Jinchuan III mine crushing station is 5.87%. Monitoring data shows that
W. Yu (&) Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China e-mail: [email protected] W. Yu F. Zhang S. Yao B. Pan School of Resource & Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China
the deformation of surrounding rock supported by overlap arch bearing body trend to be stable, and the convergence speed is less than 0.1 mm/day. Keywords Deep surrounding rock Support structure Bearing body Reliability Stability
1 Introduction High geo-stress has become one of the typical geological features of underground rock mass engineering, which seriously affects the safety and stability of surrounding rock of deep caverns. Due to the complexity of the environment, after the excavation of the rock mass, there are a large number of uncertain factors which lead to the inaccurate analysis of the mechanical process and stability of the surrounding rock and the supporting structure (Hoek 2007; Hadjigeorgiou and Harrison 2011). In view of this, the reliability analysis theory is introduced into the theory of surrounding rock support structure bearing capacity of deep roadway. Many scholars have carried out research on the reliability analysis theory of surrounding rock support, considering the uncertain factors of the bearing capacity of the surrounding rock support structure in deep roadway. For example, in order to study the reliability of roadway bolt support design, Hoek (1998, 2007) presented the probability analysis
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Geotech Geol Eng
of a circular tunnel via the Mon
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