Geomechanical Model Test and Energy Mechanism Analysis of Zonal Disintegration in Deep Surrounding Rock

Gao, Qiang; Zhang, Qiangyong; Zhang, Xutao; Zhang, Longyun

doi:10.3390/geosciences8070237

Cited by 11 publications

(5 citation statements)

References 22 publications

(25 reference statements)

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“…With its advantages of visualization, intuition and realism, the geomechanical model test is of great significance to the study of damage mechanism of underground caverns (Chen et al 2013a(Chen et al , 2013b(Chen et al and 2013cZhang et al 2013 andGao et al 2018). The method can also simulate excavation and unloading under real three-dimensional high ground stress conditions, reproduce the damage pattern of the cavern, and capture the variations in deformation and stress (Zhang et al, 2019a(Zhang et al, , 2019b.…”

Section: Introductionmentioning

confidence: 99%

Failure Mechanism and Numerical Simulation of Splitting Failure for Deep High Sidewall Cavern Under High Stress

Zhang

Wen

et al. 2021

Geotech Geol Eng

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With the increase of the depth of the underground engineering, the phenomenon of splitting failure of the deep rock will appear, which is very different from the shallow cavern. In order to reveal the formation mechanism of splitting damage, mechanical model tests and numerical simulations of splitting damage were carried out respectively. Using the Pubugou Hydropower Station as the engineering background, a three-dimensional (3D) geomechanical model test was conducted relying on a high stress three-dimensional load test system. The splitting damage phenomenon of high sidewall cavern was observed, and the oscillation variations of displacement and stress were measured. Based on strain gradient theory and continuum damage mechanics, an elastic-plastic damage softening model for splitting damage was established. The relationship between rock damage and energy dissipation was analyzed. Based on the strain energy density theory, the splitting damage criterion based on the strain gradient is established. A numerical analysis method for splitting damage was proposed, and a regional disintegration calculation program was developed based on a commercial finite element code. The numerical simulation results are in basic agreement with the 3D geomechanical model test.

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Section: Introductionmentioning

confidence: 99%

Failure Mechanism and Numerical Simulation of Splitting Failure for Deep High Sidewall Cavern Under High Stress

Zhang

Wen

et al. 2021

Geotech Geol Eng

Self Cite

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“…In order to investigate the failure features of the surrounding rock and the rationality of supporting methods accurately, many similar simulation tests and numerical experiments were conducted in the past few years [13][14][15][16][17][18]. Gao et al [16] studied the oscillation law of rock displacement under excavation unloading through a 3D geomechanical model test and proposed a new energy failure criterion. Lin et al [17] researched the deformation, stress, and failure of roadway surrounding rock under the high geostress through a geomechanical model test and found that local rockburst occurred within the roadway.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Deformation and Acoustic Emission Characteristics of Arch Roadway under Different Unloading Rates

Hou

Liang

Jing

et al. 2020

Advances in Civil Engineering

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The essence of roadway excavation is a process of unloading at the periphery, and the influence of unloading paths on surrounding rock damage is directly related to the selection of support design and construction technology. The real stress state of surrounding rock is often affected by different excavation conditions in the actual construction process. Therefore, a testing system of excavation and unloading model was developed to simulate the unloading process of the arch roadway under different excavation conditions. Small hollow cylindrical specimens used in this experiment were made of cement mortar. The load at the inner cavity of specimens was removed under the constant action of external pressure and axial force to simulate the real excavation unloading process. The deformation, the failure modes, and the acoustic emission evolution characteristics at the inner of specimens were obtained under unloading conditions using the strain and acoustic emission monitoring systems. The experimental results indicate that deformation laws of surrounding rock were similar under different unloading rates and initial geostresses, but failure modes and acoustic emission characteristics were quite different. Compared with that of slow unloading, the damage of surrounding rock under rapid unloading mainly accumulated after unloading, and it is easier to induce rockburst after unloading. As initial geostress increased, the occurring time of the main fracture may be delayed relatively, and the phenomenon that the distribution range of peak frequency expanded and the amplitude rose gradually can be regarded as the precursor information of the main fracture occurring. This study can be used to provide experimental support for the failure and supporting design of surrounding rock in deep underground engineering.

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“…Structural features such as faults, joints, interlayer slippage zones, and pelletization dissection are usually well developed and are considered to be other types of main structure plane in red beds, such as the interlayer slippage zone (a structurally related feature) of red beds located in southwestern China [26] and faults or fractures at the depth of red beds in the South Georgia Rift (SGR) basin [27]. It is well known that rock mass structures play a dominant role in the stability of a rock mass [11,16,28]. The characteristics of slope failures in red beds are summarized from field investigations and case studies as follows:…”

Section: Introductionmentioning

confidence: 99%

“…It is well known that rock mass structures play a dominant role in the stability of a rock mass [11,16,28]. The characteristics of slope failures in red beds are summarized from field investigations and case studies as follows:…”

Section: Introductionmentioning

confidence: 99%

Classification of Red-Bed Rock Mass Structures and Slope Failure Modes in South China

et al. 2019

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Red beds are Meso–Cenozoic continental sedimentary strata that are mainly composed of gravel stone, sandstone, siltstone, mudstone, and shale and occasionally have interlayers of limestone, halite, and gypsum. As a typical rock mass, red beds are widely distributed throughout South China. In a typical tropical and subtropical continental environment, red beds are the product of multiple sedimentary cycles, which have resulted in complicated rock mass structures that play an important role in rock mass stability. It is thus of great significance to investigate the influence of different rock mass structures on the stability of red-bed slopes. In this paper, the geological formation history of red beds in South China is described. The main features of red-bed rock mass slopes in South China are discussed. The main combinations of inner geomechanical structures comprise: (1) mega-thick soft rock structures; (2) mega-thick hard rock structures; (3) thick hard rock structures with weak intercalation; and (4) soft–hard interbedded structures. In addition, the features of slope failure are analyzed, and four common failure modes are identified from the statistical data: (a) weathering spalling and scouring; (b) rock falls; (c) landslides; and (d) tensile dumping.

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Geomechanical Model Test and Energy Mechanism Analysis of Zonal Disintegration in Deep Surrounding Rock

Cited by 11 publications

References 22 publications

Failure Mechanism and Numerical Simulation of Splitting Failure for Deep High Sidewall Cavern Under High Stress

Failure Mechanism and Numerical Simulation of Splitting Failure for Deep High Sidewall Cavern Under High Stress

Experimental Study on Deformation and Acoustic Emission Characteristics of Arch Roadway under Different Unloading Rates

Classification of Red-Bed Rock Mass Structures and Slope Failure Modes in South China

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