Cosserat ordinary state-based peridynamic model and numerical simulation of rock fracture

Zhou, Luming; Zhu, Shu; Zhu, Zhende

doi:10.1016/j.compgeo.2022.105240

Cited by 10 publications

(3 citation statements)

References 45 publications

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“…The Coulomb slip joint constitutive model based upon elastic stiffness, frictional, cohesive and tensile strength properties, and dilation characteristics common to rock joints simulating displacement-weakening of the joint by loss of cohesive and tensile strength at the onset of shear or tensile failure can better reflect the sliding failure and tension of joint surfaces, providing a linear representation of joint stiffness and yield limit, which is very suitable for complex rock masses with multiple joint surfaces such as CJRM. Therefore, this joint model [37,38] was used in this paper, and the schematic diagram of the contact surface constitutive model is shown in Figure 5. According to the geological survey report and related numerical simulation studies of CJRM [25,39], the numerical model parameters are listed in Tables 2 and 3.…”

Section: Establishment Of Numerical Modelmentioning

confidence: 99%

A Case Study on Tunnel Excavation Stability of Columnar Jointed Rock Masses with Different Dip Angles in the Baihetan Diversion Tunnel

Wang

Zhu

et al. 2023

Symmetry

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Columnar jointed rock mass (CJRM) formed by intact rock divided by special symmetrical columnar joints is a special type of rock with poor mechanical properties, strong anisotropy, and weak self-supporting ability, severely affecting the excavation safety and stability of underground tunnels. In this study, taking the Baihetan hydropower station as the engineering background, CJRM geological numerical models with different dip angles that combined well with the natural CJRM were generated based on the geological statistical parameters of the engineering site and were verified to have high rationality and accuracy. Tunnel excavation and overloading tests were carried out on these numerical models, and the results showed that the stress and displacement distributions after excavation exhibited strong anisotropic characteristics under different dip angles, and the positions where engineering safety problems are most likely to occur are the side walls, which are prone to stress-structure-controlled failure mode. The self-supporting ability at different dip angles after excavation from weak to strong are 45°, 60°, 75°, 90°, 30°, 0°, and 15°. The safety factors assessed by overloading for CJRM with dip angles of 0–90° degrees were 2.5, 2.6, 2.6, 1.8, 2.1, and 2.2, respectively, providing a valuable reference for the construction safety and support measures of CJRM excavation.

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Section: Establishment Of Numerical Modelmentioning

confidence: 99%

A Case Study on Tunnel Excavation Stability of Columnar Jointed Rock Masses with Different Dip Angles in the Baihetan Diversion Tunnel

Wang

Zhu

et al. 2023

Symmetry

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“…The combination of deep learning solutions and traditional mining engineering problems provides a scientifically effective method and means for the design of coal pillar widths [17,18]. The LSTM network model has a good predictive performance on non-time series data, with special gating units and decent non-linear mapping capabilities [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Construction and Application of an Intelligent Prediction Model for the Coal Pillar Width of a Fully Mechanized Caving Face Based on the Fusion of Multiple Physical Parameters

Yan,

Wang,

et al. 2024

Sustainability

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The scientific and reasonable width of coal pillars is of great significance to ensure safe and sustainable mining in the western mining area of China. To achieve a precise analysis of the reasonable width of coal pillars in fully mechanized caving face sections of gently inclined coal seams in western China, this paper analyzes and studies various factors that affect the retention of coal pillars in the section, and calculates the correlation coefficients between these influencing factors. We selected parameters with good universality and established a data set of gently inclined coal seams based on 106 collected engineering cases. We used the LSTM algorithm loaded with a simulated annealing algorithm for training, and constructed a coal pillar width prediction model. Compared with other prediction algorithms such as the original LSTM algorithm, the residual sum of squares and root mean square error were reduced by 27.2% and 24.2%, respectively, and the correlation coefficient was increased by 12.6%. An engineering case analysis was conducted using the W1123 working face of the Kuangou Coal Mine. The engineering verification showed that the SA-CNN-LSTM coal pillar width prediction model established in this paper has good stability and accuracy for multi-parameter nonlinear coupling prediction results. We have established an effective solution for achieving the accurate reservation of coal pillar widths in the fully mechanized caving faces of gently inclined coal seams.

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“…With the further development of rock mechanics and engineering, to establish constitutive relationships and failure criteria that truly reflect the behavior of rocks, it is necessary to understand the mechanisms of crack initiation, nucleation, propagation, coalescence, and evolution leading to failure within the rocks. This is because rock failure occurs when localized microcracks propagate to macroscopic cracks, develop into coalescence, and eventually reach overall instability [ 19 ]. Solving this problem requires experimental research that reproduces the deformation and strength degradation patterns of rocks in complex environments, as well as the process of crack propagation and coalescence.…”

Section: Introductionmentioning

confidence: 99%

Research Progress and Hot Spot Analysis of the Propagation and Evolution Law of Prefabricated Cracks in Defective Rocks

Zhu

Wang

2023

Materials

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The generation of rock mass disasters in underground engineering essentially arises from the disruption of the original three-dimensional stress equilibrium of the rock mass caused by excavation and other activities, leading to the redistribution of stress fields. During the excavation process, the engineering rock mass undergoes complex dynamic stress equilibrium processes involving loading and unloading. This equilibrium process promotes the nucleation, initiation, and propagation of pre-existing cracks in the surrounding rock, resulting in changes in the internal structure of the rock mass and a weakening of its strength. Eventually, this localized cracking extends to global failure. In order to understand the current status better and study the development trends in the study of crack propagation and evolution in defective rock, this study conducts a bibliometric analysis of 288 articles from the Web of Science Core Collection database using CiteSpace software (version 6.1.R4). The results indicate an increasing trend in the annual publication output, characterized by two phases of emergence and rapid development. The countries of China, the United States, and Iran have the highest publication output in this field. The most frequently cited journals include INT J ROCK MECH MIN, ENG FRACT MECH, and ROCK MECH ROCK ENG. This study provides a comprehensive analysis of the current status and development trends in the research on the propagation and evolution of pre-existing cracks. This study enhances the comprehension of crucial aspects of crack propagation and evolution in rock materials with defects. Moreover, it opens up new possibilities for future investigations and holds promising implications for researchers and practitioners in the field.

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Cosserat ordinary state-based peridynamic model and numerical simulation of rock fracture

Cited by 10 publications

References 45 publications

A Case Study on Tunnel Excavation Stability of Columnar Jointed Rock Masses with Different Dip Angles in the Baihetan Diversion Tunnel

A Case Study on Tunnel Excavation Stability of Columnar Jointed Rock Masses with Different Dip Angles in the Baihetan Diversion Tunnel

Construction and Application of an Intelligent Prediction Model for the Coal Pillar Width of a Fully Mechanized Caving Face Based on the Fusion of Multiple Physical Parameters

Research Progress and Hot Spot Analysis of the Propagation and Evolution Law of Prefabricated Cracks in Defective Rocks

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