Multiscale hierarchical analysis of rock mass and prediction of its mechanical and hydraulic properties

Liu, Xiao Li; Han, Guoqing; Wang, Enzhi; Wang, Sijing; Kumar, Nagesh

doi:10.1016/j.jrmge.2018.04.003

Cited by 60 publications

(21 citation statements)

References 27 publications

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“…e peak strain of the measuring points under different confining pressures in Figure 19 is fitted by (5), which reaches the conclusion that when the confining pressure is increased from 0 to 3 MPa, the physical attenuation coefficients of the cylindrical wave are 0.657, 0.601, 0.586, and 0.749, respectively. Similarly, according to the above method, the physical attenuation coefficients of cylindrical wave in the T2 test sample are 0.641, 0.623, 0.539, and 0.776, respectively.…”

Section: Effect Of Confining Pressurementioning

confidence: 72%

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Model Test Study on Cylindrical Blasting Stress Wave Propagation across Jointed Rock Mass with Different Initial Stresses

Dong

Huang

2020

Advances in Civil Engineering

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In the drilling and blasting excavation of underground rock mass, the stress wave produced by the blasting holes usually propagates in the form of cylindrical wave, while the rock mass surrounding the underground engineering is initially subjected to the in situ stress. To explore the propagation and attenuation law of cylindrical stress wave in the in situ stressed rock mass, a model test of cylindrical blasting stress wave propagation across the intact and jointed rock mass under different initial stresses was carried out. First, the attenuation law of the cylindrical stress wave in the intact rock mass under different confining pressures is analysed, and then the influence of the confining pressure scales, the angle, and the number of joints on the propagation law of the cylindrical blast wave in the jointed rock mass is studied. The experimental results show that the physical attenuation of the cylindrical wave in the intact rock mass decreases and then increases as the confining pressure increases from zero. Under zero confining pressure, the transmission coefficient of the cylindrical wave in the jointed rock mass decreases with the increase of joint angle, and the transmission coefficient increases with the increase of the joint angle under confining pressure. As the confining pressure increases from zero, the transmission coefficient shows a trend of increasing firstly and then decreasing.

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Section: Effect Of Confining Pressurementioning

confidence: 72%

“…e natural rock mass contains a large number of joints which have a great impact on the mechanical properties of rock mass and the propagation of stress wave [1][2][3][4][5][6][7][8]. At present, most of the rock mass excavation involved in underground engineering still adopts the drilling and blasting method.…”

Section: Introductionmentioning

confidence: 99%

Model Test Study on Cylindrical Blasting Stress Wave Propagation across Jointed Rock Mass with Different Initial Stresses

Dong

Huang

2020

Advances in Civil Engineering

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“…In fact, during construction and operation of major engineering projects, e.g., civil engineering, mining engineering, hydraulic engineering, bridge engineering and petroleum engineering, the structures built in or on rock mass not only bear the complex in situ conditions, e.g., stress, seepage, faulting, thermal and chemical coupling, but also often encounter a variety of dynamic disturbances during engineering construction and operation periods (e.g., blasting, TBM excavation, hydraulic fracturing, geological drilling and rockburst during engineering construction, natural earthquakes, driving loads, sequential explosions or even military attacks during engineering operation), whose strain rate is over the threshold value (Meyers 1994;Zhang and Zhao 2014a). Besides, the major engineering projects after construction are no longer built in or on the natural intact surrounding rocks, but located in or on the disturbed and deteriorated rock masses (Li et al 2013a, b;Deng et al 2014;Liu et al 2018). As a result, the mechanical responses of major engineering become more complicated due to the coupled impact of the dynamic disturbances and in situ conditions.…”

Section: Introductionmentioning

confidence: 99%

Conceptualization and preliminary study of engineering disturbed rock dynamics

Xie

Zhu

Zhou

et al. 2020

Geomech. Geophys. Geo-energ. Geo-resour.

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Many large engineering projects, e.g., the Sichuan–Tibet Railway, inevitably cross the earthquake active areas and the geology complicated zones, facing the challenges of dynamic disturbances and disasters. In view of this, the conceptualization of engineering disturbed rock dynamics is proposed in this paper, aiming to systematically study the rock dynamic behavior and response subjected to engineering disturbances, to establish the 3D rock dynamic theory, and to develop the disaster prevention and control technical measures. The classification standards of rock loading states based on strain rate are summarized and analyzed. The engineering disturbed rock dynamics is defined as the theoretical and applied science of rock dynamic behaviors, dynamic responses and their superposition caused by dynamic disturbances during engineering construction and operation periods. To achieve the goals of the proposed engineering disturbed rock dynamics, a combined methodology of theoretical analysis, laboratory experiment, numerical simulation and in situ tests is put forward. The associated research scopes are introduced, i.e., experimental and theoretical study of engineering disturbed rock dynamics, wave propagation, attenuation and superposition in rock masses, rock dynamic response of different loading conditions, dynamic response of engineering projects under construction disturbance and disaster mitigation techniques, and dynamic response of major engineering projects under operation disturbance and safety guarantee measures. Some theoretical, experimental and field preliminary studies were performed, including dynamic behavior of disturbed rock at varied depth and strain rates, dynamic response of rock mass subjected to blasting excavation disturbance and dynamic drilling disturbance, and disturbance of rock mass subjected to TBM excavation. Preliminary results showed that the rock masses are significantly disturbed by dynamic disturbances during construction and operation periods of engineering projects. The innovative conceptualization of engineering disturbed rock dynamics and the expected associated outcomes could facilitate establishing the 3D rock dynamic theory and offering theoretical fundamentals and technical guarantees for safety and reliability of the design, construction and operation of modern large engineering.

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“…Some researchers considered rockburst as microseismic events that result in severe damage to rock mass structure with sudden or intensive acoustic emissions [25][26][27]. Microseismic monitoring technology has been widely used in rock mechanics and provides a feasible way to predict or prewarn rockburst [28][29][30][31]. Feng et al proposed a neural network prediction model based on the microseismic monitoring information [1].…”

Section: Introductionmentioning

confidence: 99%

Decision Tree Model for Rockburst Prediction Based on Microseismic Monitoring

Zhao

Chen

Zhu

2021

Advances in Civil Engineering

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Rockburst is an extremely complex dynamic instability phenomenon for rock underground excavation. It is difficult to predict and evaluate the rank level of rockburst in practice. Microseismic monitoring technology has been adopted to obtain microseismic events of microcrack in rock mass for rockburst. The possibility of rockburst can be reflected by microseismic monitoring data. In this study, a decision tree was used to extract the knowledge of rockburst from microseismic monitoring data. The predictive model of rockburst was built based on microseismic monitoring data using a decision tree algorithm. The predictive results were compared with the real rank of rockburst. The relationship between rockburst and microseismic feature data was investigated using the developed decision tree model. The results show that the decision tree can extract the rockburst feature from the microseismic monitoring data. The rockburst is predictable based on microseismic monitoring data. The decision tree provides a feasible and promising approach to predict and evaluate rockburst.

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Multiscale hierarchical analysis of rock mass and prediction of its mechanical and hydraulic properties

Cited by 60 publications

References 27 publications

Model Test Study on Cylindrical Blasting Stress Wave Propagation across Jointed Rock Mass with Different Initial Stresses

Model Test Study on Cylindrical Blasting Stress Wave Propagation across Jointed Rock Mass with Different Initial Stresses

Conceptualization and preliminary study of engineering disturbed rock dynamics

Decision Tree Model for Rockburst Prediction Based on Microseismic Monitoring

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