Research on Multijoint Rock Failure Mechanism Based on Moment Tensor Theory

Chai, Jinfei

doi:10.1155/2020/6816934

Cited by 8 publications

(4 citation statements)

References 23 publications

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“…The moment tensor method [76] decomposes the moment tensor into dual force couples, isotropic components, and compensated linear vector dipoles, and divides the microcrack cracking modes based on the proportion of pure shear fracture components. Wu et al [77] analyzed the source mechanism of microseismic events in the Heilingen mining area of Germany using the moment tensor inversion method and conducted research on early warning and prevention of rock engineering disasters. Chai [78] analyzed microseismic events in mining rock masses and calibrated the fracture risk zone using the moment tensor inversion method, source type plot method, and fracture orientation map method.…”

Section: Current Research Status Of Concrete Damage Identification Me...mentioning

confidence: 99%

Research progress in monitoring hydraulic concrete damage based on acoustic emission

Su,

Xu,

Zuo

et al. 2023

Journal of Intelligent Construction

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Section: Current Research Status Of Concrete Damage Identification Me...mentioning

confidence: 99%

Research progress in monitoring hydraulic concrete damage based on acoustic emission

Su,

Xu,

Zuo

et al. 2023

Journal of Intelligent Construction

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“…Han et al [6] developed a treatment technology for optimizing the stress state of railway tunnel bottom structure. Chai [7,8] analyzed the dynamic response characteristics for basement structure of heavy-haul railway tunnel with defects and researched the multijoint rock failure mechanism based on moment tensor theory.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of the Lining Reinforcement Structure of a Double-Track Heavy-Haul Railway Tunnel

Ma,

Chai,

et al. 2023

Advances in Civil Engineering

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An increasing number of railway tunnels are afflicted with railway tunnel lining diseases. Through on-site detection of lining diseases in double-track railway tunnels, this paper analyzed its causative factors and developed a section steel arch frame lining reinforcement. Through a simulation of its mechanical performance, both the steel plate and concrete met the tensile strength code requirements for railway tunnel design (TB 10003-2016). It effectively repaired the damage from lining diseases under narrow-site and short maintenance “window” time conditions without affecting the normal operation of catenary and power supply facilities. This reinforcement has great practical significance and broad application prospects.

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“…Yu et al studied the virtual hybrid simulation method for underground structures subjected to seismic loadings [26,27]. Based on the Least Square Method, some scholars have analyzed different cases [28][29][30][31][32][33][34][35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Research on Dynamic Response Characteristics for Basement Structure of Heavy Haul Railway Tunnel with Defects

Chai

2021

Mathematics

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Based on the basic principle of thermodynamics, an elastoplastic damage constitutive model of concrete is constructed in this paper. The model is realized and verified in FLAC3D, which provides a solid foundation for the study of dynamic response and fatigue damage to the base structure of a heavy haul railway tunnel. The dynamic response and damage distribution of the base structure of a heavy-duty railway tunnel with defects were numerically simulated by the concrete elastic-plastic damage constitutive model. Then, by analyzing the response characteristics of the tunnel basement structure under different surrounding rock softening degrees, different foundation suspension range and different foundation structure damage degree are determined. The results show the following: (1) The elastoplastic damage constitutive model of concrete can well describe the stress–strain relationship of materials, especially with the simulation results of post peak softening being in good agreement with the test results, and the simulation effect of the unloading–reloading process of the cyclic loading and unloading test also meet the requirements. (2) The initial stress field and dynamic response of the tunnel basement structure under the action of train vibration load are very different from the ideal state of the structure design when the surrounding rock of the base is softened, the base is suspended, or the basement structure is damaged. With the surrounding rock softening, basement hanging, or basement structure damage developing to a certain extent, the basement structure will be damaged. (3) The horizontal dynamic stress amplitude increases with the increase in the softening degree of the basement surrounding rock. The horizontal dynamic stress of the measuring point increases with the increase in the width of the hanging out area when the hanging out area is located directly below the loading line. When the degree of damage to the basement structure is aggravated, the horizontal dynamic tensile stress of each measuring point gradually decreases. (4) The maximum principal stress increment increases with the increase in the fracture degree of the basement structure, while the minimum principal stress increment decreases with the increase in the fracture degree of the basement structure, but the variation range of the large and minimum principal stress increments is small. The research results have important theoretical and practical significance for further analysis of the damage mechanism and control technology of the foundation structure of a heavy haul railway tunnel with defects.

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Research on Multijoint Rock Failure Mechanism Based on Moment Tensor Theory

Cited by 8 publications

References 23 publications

Research progress in monitoring hydraulic concrete damage based on acoustic emission

Research progress in monitoring hydraulic concrete damage based on acoustic emission

Stability Analysis of the Lining Reinforcement Structure of a Double-Track Heavy-Haul Railway Tunnel

Research on Dynamic Response Characteristics for Basement Structure of Heavy Haul Railway Tunnel with Defects

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