# Study on Failure Mechanism of Mudstone Based on Digital Core and Digital Volume Correlation Method  
[PERSON]  
1 College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China 12 Key Laboratory of In-Situ Property-Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China 2  
meso-damage. [PERSON] et al. [6] studied the freeze-thaw rock damage variables of mesoscopic pores.  
The physical experiment method is to use a high-power optical microscope, electron microscope, and CT to directly scan the rock samples to construct digital cores. [PERSON] et al. [7] found the relationship between three kinds of pores and mineral composition by electron microscope and CT scanning. [PERSON] et al. [8] also conducted related studies. Many scholars obtained the law of fracture changing with stress and found that the CT scanning technique can better evaluate the spatial attribute, distribution, and connectivity of macropores [9; 10; 11]. On the basis of a high-resolution 3D CT scanning system, it is widely used to automatically identify the main mineral composition in rock and analyze the law of fracture propagation in rock [12; 13; 14]. The influence of mineral composition and microstructure on rock mechanical properties is discussed by constructing digital cores [15; 16; 17; 18; 19].  
It is impossible to analyze the internal dynamic strain of rock only with the help of digital core. The digital volume image correlation method provides the possibility for this. [PERSON] et al. [20] found that DIC technology can effectively characterize the strain evolution and crack formation and propagation of materials. [PERSON] et al. [21] extended the digital image correlation method and proposed the continuous field 3D digital volume image correlation method DVC. [PERSON] et al. [22] revealed the strain evolution characteristics and failure mechanism of glass fiber composites by the DVC method.  
The failure of rock has an extremely important relationship with its internal microstructure, main diagenetic composition, and spatial distribution of diagenetic composition. In order to study the failure mechanism of rock, it is necessary to explore the process of crack propagation and development and stress failure zone distribution from macro and micro angles. It is well known that rock is a kind of complex heterogeneous material. The composition and distribution of main components and pore space distribution in rock have an important influence on the mechanical properties of rock. The way in which to accurately describe the composition and spatial distribution of the main diagenetic minerals and the spatial distribution of primary pores and cracks in the rock, as well as the way to establish the diagenetic composition and the relationship between cracks and rock failure is the focus of this article.  
In this paper, the influence of brittle mineral composition on rock failure was studied by establishing a pore network model based on digital core by using the CT scanning method in a physical experiment, combined with XRD and SEM analysis results. The quantitative analysis of minerals and pores from the aspects of content and distribution characteristics can comprehensively master the microstructure information of rock, so as to indirectly evaluate the mechanical properties and failure mechanism of rock.