A Strain-Softening Constitutive Model of Heterogeneous Rock Mass Considering Statistical Damage and Its Application in Numerical Modeling of Deep Roadways

Li, Guang; Ma, Feifei; Liu, Gang; Zhao, Haijun; Guo, Jie

doi:10.3390/su11082399

Cited by 26 publications

(12 citation statements)

References 29 publications

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“…Even for the same rock material, the difference in loading or unloading patterns results in varying mechanical properties for rocks. Universal constitutive models ignore these influences, meaning applications of these universal constitutive models and failure criteria results in large modeling errors, especially under complex loading conditions or stress paths because most universal constitutive models and failure criteria are established based on simple uniaxial loading tests [27]. In this paper, damage factors along the maximum and minimum principle stresses were added into consideration and a constitutive model considering anisotropic damage was proposed.…”

Section: A Constitutive Model and Failure Criterion Of Surrounding Romentioning

confidence: 99%

Supporting Design Optimization of Tunnel Boring Machines-Excavated Coal Mine Roadways: A Case Study in Zhangji, China

et al. 2020

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Tunnel Boring Machines (TBMs) are a cutting-edge excavating equipment, but are barely applied in underground coal mines. For TBM excavation projects involving the Zhangji coal mine, the surrounding rock properties, stress field, cross section geometry, as well as the excavation-induced stress path of TBM-excavated coal mine roadways are different from those of traditional tunnels or roadways. Consequently, traditional roadway supporting technologies and experiences cannot be relied on for this project. In order to research an appropriate supporting pattern for a TBM-excavated coal mine roadway, first of all, the constitutive model of roadway surrounding rocks was derived, and a rock failure criterion was proposed based on rock mechanical tests. Secondly, a three-dimension finite element model was established and computer simulations under three different supporting patterns were conducted. Stress redistribution, roadway convergence, and excavation damage zone ranges of surrounding rocks under three different support patterns were analyzed and an optimal support design of the TBM-excavated roadway was made based on simulation results. During roadway excavation, convergence gauge and rock bolt dynamometers were installed for monitoring roadway convergence and the axial forces of rock bolts. The in-situ monitoring results verified the validity of roadway supporting designs.

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Section: A Constitutive Model and Failure Criterion Of Surrounding Romentioning

confidence: 99%

Supporting Design Optimization of Tunnel Boring Machines-Excavated Coal Mine Roadways: A Case Study in Zhangji, China

et al. 2020

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“…The usage of strain softening model is very important for the simulation of tensile-shear bands. The strain softening model was used to qualitatively and quantitatively analyze the failure of roadway (Cao et al 2019; Guan et al 2020;Li et al 2019;Kang et al 2021;Zhou et al 2009), which showed that the strain softening model can better simulate the dynamic failure characteristics of surrounding rock of roadway. Lu et al (2010) obtained the softening law of post-peak mechanical parameters of weak rock through establishing the subsequent yield surface model of weak rock characterized by two state parameters (generalized cohesion and generalized internal friction angle).…”

Section: Introductionmentioning

confidence: 99%

Study on Mechanical Behavior and Failure Network of Deep Roadway under Different Lateral Pressure Coefficients

Luo

Guo

et al. 2021

Preprint

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The failure and instability of roadway is a main disaster with the highest frequency in coal mines. The development of surrounding rock control technology is an important way to ensure mine safety. In order to obtain the failure characteristics of surrounding rock and optimize the support method of the roadway, the numerical simulation and physical simulation were used to investigate the mechanical behavior of deep roadway under different lateral pressure coefficients. The evolution mechanism of meso tensile-shear cracks in excavation damaged zone (EDZ) were deeply revealed. The results show that the shear bands which are basically in the form of sliding spiral extends from the two sidewalls to the roof and floor with the increase of lateral pressure coefficient, and develop to the deep surrounding rock. The “crescent-shaped” tensile failure zones generate in the roof and floor when λ < 1, and gradually decrease with the increase of horizontal stress. When λ = 1, the failure pattern around the arch and right angle sides are different influenced by the shape of different side. Under the special stress environment of high deviatoric stress, the pattern of plastic zone will lead to butterfly-like failure mode induced by the stress relief of excavation. Judged from the curves of tangential and deviatoric stress, the surrounding rock in the two sidewalls, the roof and floor are greatly damaged under λ < 0.75 and λ > 1.5 respectively. The verification of the numerical simulation experiment is proved by the similar material simulation experiment.

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“…Qin [15] used the method of theoretical analysis and numerical simulation to systematically study the distribution characteristics of the roof bearing structure of the deep soft rock roadway and finally proposed and successfully applied the roof reinforcement scheme of the deep dynamic soft rock roadway. Li [16] analyzed the strain-softening behavior, damage, and heterogeneity of rock masses of the deep roadway, established the strain-softening model of heterogeneous jointed rock mass considering the statistical damage, and successfully applied the model to the engineering practice. Through numerical simulation and similar material test, Qi [17] studied the influence of roof presplitting and rock mass filling on the stability of roadway surrounding rock of deep high stress roadway.…”

Section: Introductionmentioning

confidence: 99%

Long High-Performance Sustainable Bolt Technology for the Deep Coal Roadway Roof: A Case Study

et al. 2020

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High-efficiency maintenance and control of the deep coal roadway roof stability is a reliable guarantee for safe production and sustainable development of a coal mine. With belt haulage roadway 3108 in MenKeqing coal mine as the research background, in situ investigation, theoretical analysis, numerical simulation, and engineering practice were carried out to reveal the law of improving the bearing state of bolts by increasing the thickness of the roof anchoring layer. Also, the mechanism of the high-efficiency and long anchoring of the roof is revealed. Results show that increasing thickness of the roof anchorage layer could mobilize deep rock mass to participate in the bearing and promote the bolt to increase the resistance in a timely manner to limit the deformation of rock mass. Through the close link between shallow soft rock mass and deep stable rock mass, the deformation of the shallow rock mass is well controlled and so are the development and expansion of the roof separated fissures from shallow to deep. Long high-performance sustainable bolt technology for roof are proposed and carried out to control the stability of the deep roadway roof. Engineering practice indicates that deformations of roof could be efficiently controlled. The maximum deformations of the roof and sidewall-to-sidewall are 17 mm and 24 mm, respectively. No obvious separation fissures are found in the anchoring range of roof. This study provides a reference for roof stability control of deep roadway under similar conditions.

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A Strain-Softening Constitutive Model of Heterogeneous Rock Mass Considering Statistical Damage and Its Application in Numerical Modeling of Deep Roadways

Cited by 26 publications

References 29 publications

Supporting Design Optimization of Tunnel Boring Machines-Excavated Coal Mine Roadways: A Case Study in Zhangji, China

Supporting Design Optimization of Tunnel Boring Machines-Excavated Coal Mine Roadways: A Case Study in Zhangji, China

Study on Mechanical Behavior and Failure Network of Deep Roadway under Different Lateral Pressure Coefficients

Long High-Performance Sustainable Bolt Technology for the Deep Coal Roadway Roof: A Case Study

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