Abstract
The structural planes existing in natural rock mass can control the failure process of rock mass. Based on the progressive response-stability failure process of a single fracture interface, the relationship between progressive response and material failure of composite rock mass is discussed. The method of friction contact plane analysis in PANDAS numerical analysis software is applied to explore the correlation between the movement and mechanical properties of composite rock mass under external forces. The motion index is mainly represented by the sliding speed and distance of the contact surface, while the mechanical properties are mainly explained by the normal contact force, the friction of the contact surface, the friction coefficient and the material damage. The relationship between these six variables illustrates the progressive response relationship during the movement of the composite rock mass. Based on the static and progressive characteristics of the progressive response process of deep rock mass engineering, the failure evolution law and energy dissipation law of composite rock mass loading process and the synergistic failure characteristics of composite rock mass are discussed. The scientific problems that need to be studied in the structure, deformation and failure of deep rock mass are put forward. The reference is provided for the failure law of fractured rock mass in water inrush process under the influence of mining, as well as fault plate material and the study of mechanical state of rock mass in fault fracture zone.
Highlights
There are many kinds of contact interfaces in deep underground rock mass and underground engineering, such as different lithostratigraphic structural interfaces, geological fissures of the same lithology, and contact structural planes formed by other natural factors such as fracture zones and joints
In the study of mechanical properties of rock mass with structural planes, Chen (Tan.1982, Tan and Kang.1991) realized that rock mass deformation consists of rock medium deformation in rock blocks and deformation of rock blocks in the vicinity of boundary planes and weakening areas of rock masses, and carried out theoretical and experimental studies based on rheological viewpoints (Wang et al.2020, Guo et al.2001).Mu (Mu et al.2013) analyzed the evolution law of physical parameters such as displacement, acceleration, stiffness and energy of each part of rock-coal-rock assemblage during loading
Liu (Liu et al.2004) studied the mechanical properties and progressive failure characteristics of coal-rock assemblages with different height ratios through uniaxial tests. studied the overall strength and failure mechanism of monolithic coal, rock and coal-rock assemblages with 0 degree dip under uniaxial and triaxial loads were studied (Mohammadi and Tavakoli.2015; Panaghi et al.2015)
Summary
The energy accumulation, dissipation and transfer process at the interface occurs under the influence of these contact planes. Studying the friction effect of the contact interface during the motion of the composite and the transient sliding and block failure characteristics of the interface are of great significance for studying the progressive instability process of the underground rock mass. Liu (Liu et al.2004) studied the mechanical properties and progressive failure characteristics of coal-rock assemblages with different height ratios through uniaxial tests. In order to explore the mechanism of instability and failure of multi-fractured rock masses, scholars have conducted a lot of research: (Wang et al.2007) studied the characteristics of failure movement of multi-fractured rock mass in near-fault mining, and analyzed the risk of progressive disasters. In order to study the corresponding relationship between fault and time, the development process of the damage factor, and the difficulty of monitoring the physical speed in the composite rock mass, such as monitoring speed and friction, computer simulation technology has become the most effective monitoring method. Get the main control and correlation between progressive response and material damage
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