Simulation of the Fracturing Process of Inclusions Embedded in Rock Matrix under Compression

Yu, Chaoyun; Gong, Bin; Wu, Na; Xu, Penglei; Bao, Xiankai

doi:10.3390/app12168041

Cited by 12 publications

(4 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The numerical simulations of the layered shale samples under uniaxial and triaxial compression were carried out using the RFPA method 33‐35 based on the statistical strength theory, damage mechanics and continuum theory. By introducing the heterogeneity coefficient to characterize the heterogeneity of rock material, it can simulate the redistribution of the stress field and the induced creation and evolution of microfractures 36‐38 . It has been applied to numerically reproduce the gradual failure process of rock material by many researchers 39‐41 .…”

Section: Methodsmentioning

confidence: 99%

“…By introducing the heterogeneity coefficient to characterize the heterogeneity of rock material, it can simulate the redistribution of the stress field and the induced creation and evolution of microfractures. [36][37][38] It has been applied to numerically reproduce the gradual failure process of rock material by many researchers. [39][40][41] Compared with the traditional finite element method, the RFPA method has three main characteristics: (I) The heterogeneity of rock material can be considered, and the nonlinear deformation and failure process of rock material can be simulated on the basis of the elastobrittle-plastic constitutive model.…”

Section: Theoretical Principlesmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of the anisotropic mechanical response of layered shales

Gao,

Gong,

Liang

et al. 2023

Energy Science & Engineering

Self Cite

View full text Add to dashboard Cite

Layered shales exist widely and are often encountered during shale gas development. However, the mechanical response of layered shales is significantly affected by the existence of beddings, resulting in the obvious anisotropy characteristics regarding deformation, strength and failure mode. To clarify the underlying mechanisms of shale anisotropy that control the safety of engineering projects, the numerical simulation and theoretical analysis were conducted. The results show that with the growth of confining pressure, the compressive resistance of shales gradually increases, the shear fractures govern the instability and the anisotropy index decreases. Furthermore, several strength criteria for layered rock masses were summarized, and the modified Jaeger strength criterion was proposed by introducing the anisotropic parameter . It can effectively reflect the failure modes and strength features of layered shales under triaxial conditions with a higher accuracy. Besides, the variation of cohesion and internal friction angle of layered shale samples was comprehensively analysed under the triaxial conditions. Clearly, as the inclination angle of bedding planes increases, the cohesion of layered shales first decreases, but then increases under triaxial compression, showing the ‘U’‐shaped changing trend. Additionally, the internal friction angle of layered shales gradually increases with the increase in the inclination of bedding planes.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Theoretical Principlesmentioning

confidence: 99%

Investigation of the anisotropic mechanical response of layered shales

Gao,

Gong,

Liang

et al. 2023

Energy Science & Engineering

Self Cite

View full text Add to dashboard Cite

show abstract

“…Owing to long-term geological activities, rock masses in nature commonly exhibit anisotropy, i.e., foliations, fabrics and bedding planes (Chong and Boresi 1990;Liang et al 2019;Chen et al 2022;Yu et al 2022;Feng et al 2022a). Anisotropy has a substantial influence on rock mechanical behaviors, including the deformability, strength, fracture toughness, and failure patterns, and plays an important role in governing the safety of rock structures when rocks are subject to various loadings (Debecker and Vervoort 2009;Liang et al 2014;Cho et al 2012;Gong et al 2019a;Wang et al 2022a).…”

Section: Introductionmentioning

confidence: 99%

Study of the Dynamic Failure Characteristics of Anisotropic Shales Under Impact Brazilian Splitting

Feng,

Gong,

Liang

et al. 2023

Rock Mech Rock Eng

Self Cite

View full text Add to dashboard Cite

The mechanical behaviors of shales with transversely isotropic characteristics under dynamic loading have great significance for structural instability in geotechnical engineering. To understand the effect of transverse isotropy on the deformability and tensile strength of shales subjected to dynamic loading, a group of impact Brazilian tests were carried out on shale specimens via a split Hopkinson pressure bar (SHPB) testing system. High-speed digital image correlation technology was applied to monitor the fracture process. The experimental results demonstrate that the failure strength has considerable anisotropy as the bedding angle of the embedded layers changes. Moreover, the tensile strength of shales with vertical bedding is usually higher than that of shales with parallel bedding. The observed failure mode is mainly the interaction between tensile and/or shear fractures, and with increasing loading rate, layer-activated fractures tend to occur. Furthermore, five typical failure patterns of transversely isotropic shales characterized by different mechanisms under dynamic Brazilian testing were found. The shales were sensitive to the strain rate when the deformation and fracture response under dynamic loading were assessed. In addition, the modified Nova‒Zaninetti criterion that considers the strain rate effect was proposed according to the Brazilian splitting data and dynamic coordinate system. The established criterion not only properly represents the law of dynamic strength but also provides a new understanding of the effect of strain rate on strength. It has proven to be effective for predicting the dynamic strength characteristics of shales.

show abstract

“…Simultaneously, it has obvious difficulties in reproducing fine fracturing process with satisfactory computational efficiency. Zhu and Tang (2006) proposed an elastic damage-based law which can consider the strain-rate dependency to describe the constitutive law based on the rock failure process analysis (RFPA) method (Liang et al 2015;Yu et al 2022). Meng et al (2021) set up the cohesive zone model to investigate the crack distributions within specimens affected by the number and strength of bedding planes.…”

Section: Introductionmentioning

confidence: 99%

Anisotropy and microcrack-induced failure precursor of shales under dynamic splitting

Feng

Gong

Cheng

et al. 2022

Geomatics, Natural Hazards and Risk

Self Cite

View full text Add to dashboard Cite

The dynamic anisotropy and failure mechanism of shales are greatly affected by bedding surfaces. To reveal the influence of beddings on anisotropic characteristics of shales under dynamic impact, the Brazilian splitting tests were conducted by the split Hopkinson pressure bar system. The fracturing process were monitored by the high-speed camera. Meanwhile, to understand crack initiation and propagation mechanism, the stress buildup, stress shadow and stress transfer were modelled based on the digital image processing and the rock failure process analysis method. The effect of dip angle and bedding spacing on crack initiation, propagation and coalescence was analyzed. Simultaneously, the spatial distribution and energy magnitude of crack-induced acoustic emissions were captured numerically. The results show that the shale discs continue to produce parallel cracks and cambered cracks induced by the high stresses at the tips of initial cracks; the tensile strength under dynamic splitting changes in the U-shaped trend with the bedding dip angle increasing; the cracking percentage of bedding surfaces decreases, and the cracking percentage of rock matrix increases with the bedding dip angle increasing. In addition, the acceleration of crack growth and the rapid growth of AE energy can be regarded as the effective precursors of shale failure.

show abstract

Simulation of the Fracturing Process of Inclusions Embedded in Rock Matrix under Compression

Cited by 12 publications

References 31 publications

Investigation of the anisotropic mechanical response of layered shales

Investigation of the anisotropic mechanical response of layered shales

Study of the Dynamic Failure Characteristics of Anisotropic Shales Under Impact Brazilian Splitting

Anisotropy and microcrack-induced failure precursor of shales under dynamic splitting

Contact Info

Product

Resources

About