Mechanical behavior of structurally reconstructed irregular columnar jointed rock mass using 3D printing

Xia, Yingjie; Zhang, Chuanqing; Zhou, Hui; Hou, Jirui; Su, Guoshao; Gao, Yang; Liu, Ning; Kumar, Singh Hemant

doi:10.1016/j.enggeo.2020.105509

Cited by 57 publications

(14 citation statements)

References 51 publications

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“…The density of microseismic events represents the number of microseismic events per unit volume, which directly reflects the clustering degree of microseismic events and the damage degree of rock micro-fracture (Liu et al, 2013;Yang et al, 2013;Xia et al, 2020;Zheng et al, 2021). According to the size, concentration degree, and density of micro-fracture, it is possible to infer the development trend of rock micro-fracture.…”

Section: Microseismic Event Densitymentioning

confidence: 99%

Multivariate Early Warning Method for Rockburst Monitoring Based on Microseismic Activity Characteristics

Zhao

Xia

et al. 2022

Front. Earth Sci.

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The monitoring of rockburst is one of the worldwide problems in underground engineering and how to effectively predict and early warn the occurrence of rockburst disasters has become an urgent problem to be solved. In this article, the high rockburst occurrence section of the deep diversion tunnel of Jinping Hydropower Station on the yalong River is taken as the research object. Based on the microseismic monitoring technology and combined with the principle of seismology with qualitative analysis and quantitative calculation, the distribution law of “time, space, and intensity” of microseismic activity and the change law of source parameters time series are used as the precursor characteristics of rockburst early warning. Based on these, the internal relationship between the microseismic activity and the rockburst micro-fracture was studied. The monitoring results show that the rockburst occurred before has obvious micro-fracture precursors. The microseismic activity is a self-organizing process from spatial disordered dispersion to ordered concentration. The abnormal changes in source parameters such as density of microseismic events, seismic energy density, the cumulative volume, energy index, 3S index, and b values can be used as a warning identification of rockburst. Therefore, the multivariate early warning method for rockburst monitoring based on the comprehensive analysis of source parameters in the deep tunnel is proposed. The prediction accuracy of this method is up to 80.6%, and it can provide reference for the rockburst prediction, warning, and safe construction of such tunnel engineering.

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Section: Microseismic Event Densitymentioning

confidence: 99%

Multivariate Early Warning Method for Rockburst Monitoring Based on Microseismic Activity Characteristics

Zhao

Xia

et al. 2022

Front. Earth Sci.

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“…Zhu et al (2021) studied the mechanical properties and failure characteristics of CJRM specimens under 3D stress through physical model tests. Xia et al (2020b) reconstructed irregular CJRMs using 3DP technology and then carried out uniaxial compression tests to analyze the fracture characteristics of irregular CJRMs. However, the above physical tests cannot reflect the progressive fracture process of the specimens.…”

Section: Effects Of Different Model Boundaries and Confining Pressures On The Fracture Mechanism Of Jointed Rock Massmentioning

confidence: 99%

“…Through uniaxial compression tests, the strength characteristics and failure modes of irregular CJRMs were studied. Xia et al (2020b) proposed a suitable method to accurately reconstruct the structure of irregular CJRMs using three-dimensional printing (3DP) and similarity constant. Uniaxial compression tests were carried out on the reconstructed specimens, and the test results were compared with the field test results.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Fracture Mechanisms and Energy Evolution Characteristics of Columnar Jointed Basalts With Different Model Boundaries and Confining Pressures

2021

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To reveal the mechanical mechanisms and energy release characteristics underlying progressive failure of columnar jointed basalts (CJBs) with various model boundaries and confining pressures, by combining the meso-damage mechanics, statistical strength theory, and continuum mechanics, inhomogeneous CJB models with different dip angles to the column axis are constructed. In the cases of plane stress, plane strain, and between plane stress and plane strain, the gradual fracture processes of CJBs are simulated under different confining pressures and the acoustic emission (AE) rules are obtained. The results show that: 1) in the case of plane stress, the fracture process of CJBs along direction I orthogonal to the column axis: at the initial stage of loading, the vertical joints and the transverse joints in the CJB specimen are damaged. Then, more columns in the upper middle part are cracked; 2) in the case between plane stress and plane strain, the fracture process of CJBs along the direction parallel to the column axis: at the initial stage of loading, the columnar joints are damaged. Then, the area of the damaged and broken columns at the top of the specimen increases and the crushing degree intensifies; 3) for the case between plane stress and plane strain, the AE energy accumulation before the peak stress is higher than the plane strain state along the direction orthogonal to the column axis. Meanwhile, along the direction parallel to the column axis, this value becomes larger when changing from the state between plane stress and plane strain to the plane strain state. These achievements will certainly improve our understanding of the fracture mechanism and energy evolution of CJBs and provide valuable insights into the instability precursor of CJBs.

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“…As an emerging technology, 3D printing is also used in the research of jointed rock masses. Xia et al [29] proposed and verified a new method to accurately reconstruct an irregular CJRM structure using 3D printing. This method can be used in the design of irregular CJRM in rock engineering.…”

Section: Introductionmentioning

confidence: 99%

Research on the Deformation Law of Jointed Surrounding Rock during Tunnel Excavation Based on Hydromechanical Coupling

Wang

2021

Geofluids

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The coupling of the joint network and groundwater in rock under bias conditions has a significant impact on the deformation and failure of the surrounding rock due to tunnel excavation. This paper studies the deformation and failure of surrounding rock after tunnel excavation under different joint network and groundwater conditions. A finite element-based composite joint network modeling method is proposed in this paper, and the typical parameters of the surrounding rock, such as the plastic zone size, vertical displacement, and lateral displacement, are analyzed and compared through numerical calculations. According to the different stratum and hydraulic conditions considered, four numerical models under four different working conditions are established and studied. The deformation and failure laws of the surrounding rock during tunnel excavation are obtained. The results show that with a single joint network, when there is no influence of groundwater, the surrounding rock mainly undergoes shear failure at the arch crown after tunnel excavation. When the influence of groundwater is considered, there are differences in the mode of damage between the left and right sides of the tunnel. The stratum approximately 1 m from the invert breaks, and the right sidewall fails approximately 1 m from the measuring point. In rock with a composite joint network, when groundwater is not considered, two kinds of failures occur in the surrounding rock near the tunnel; however, the surrounding rock far from the tunnel is dominated by shear failure. The stratum approximately 3.5 m from the arch crown fractures and the surrounding rock within approximately 5.5 m from the measurement point on the right sidewall undergoes separation failure. Under the dual effects of joints and groundwater, soft rock deforms considerably. The total hydraulic gradient decreases from left to right before and after tunnel excavation. The total hydraulic gradient of the composite joint network strata is generally smaller than that of the single joint network. In the composite joint network strata, the total hydraulic gradient near the tunnel changes dramatically. This research can provide a reference for tunnel engineering under similar conditions.

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Mechanical behavior of structurally reconstructed irregular columnar jointed rock mass using 3D printing

Cited by 57 publications

References 51 publications

Multivariate Early Warning Method for Rockburst Monitoring Based on Microseismic Activity Characteristics

Multivariate Early Warning Method for Rockburst Monitoring Based on Microseismic Activity Characteristics

Numerical Investigation on Fracture Mechanisms and Energy Evolution Characteristics of Columnar Jointed Basalts With Different Model Boundaries and Confining Pressures

Research on the Deformation Law of Jointed Surrounding Rock during Tunnel Excavation Based on Hydromechanical Coupling

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