Characterizing rockbursts and analysis on frequency-spectrum evolutionary law of rockburst precursor based on microseismic monitoring

Liang, Zheng Zhao; Xue, Ruixiong; Xu, Nuwen; Li, Wanrun

doi:10.1016/j.tust.2020.103564

Cited by 65 publications

(16 citation statements)

References 31 publications

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“…Similar to earthquakes, there is a complex activity process which is accompanied by the formation of microcracks and the release of elastic energy inside the rock mass before a rockburst (Li et al, 2016;Zhang et al, 2019;Huang et al, 2020;Huang et al, 2021). It is possible to capture precursory information by using MS monitoring equipment (Ma et al, 2018;Liang et al, 2020;Xiang Li et al, 2021;Xue et al, 2021).…”

Section: Microseismic Monitored the Energy Characteristics Of Typical...mentioning

confidence: 99%

Mechanism and Inducing Factors of Rockburst Events of Roadways Under Ultrathick Strata

2022

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The overlying strata of the Yima coalfield are ultrathick conglomerate. Aiming at the problem of frequent occurrence of rockburst events in the central Yima coalfield during 2006–2015, the characteristics of rockburst events, microseismic (MS) monitoring, and rockburst event-inducing factors were analyzed through data mining and field investigation methods. The results showed that the rockburst events in roadways mainly occurred during mining of the working face, and they occurred at a large buried depth and were within the influence of mining stress, accompanied by an abrupt energy release. The occurrence of rockburst in roadways was accompanied by a sudden release of energy. The ultrathick strata and the fault nearby were the key influence factors of rockburst events. The stress field of roadway surrounding rocks was changed because of the mining disturbance, roadway repair and maintenance, and blasting, which would change the regional stress fields in the surrounding rocks and induce roadway rockburst events. The characteristics of rockburst events were floor heave, sharp convergence of two side walls, severe damage of the supporting body, and even closure of the roadway. The occurrence of rockburst can be prevented by reducing the mining speed and injecting water into coal seam.

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Section: Microseismic Monitored the Energy Characteristics Of Typical...mentioning

confidence: 99%

Mechanism and Inducing Factors of Rockburst Events of Roadways Under Ultrathick Strata

2022

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“…They found that as the stress increased, the AE signal gradually changed from high frequency and low amplitude to low amplitude and high frequency. Liang et al [37] applied the wavelet transform to decompose the frequency of a complex microseismic waveform and to analyze precursor information related to rockbursts. The energy distribution of the microseismic frequency band shifted to the low frequency before rockburst occurrence.…”

Section: Frequency-domain Characteristics Of Microseismic Waveformsmentioning

confidence: 99%

Review on Early Warning Methods for Rockbursts in Tunnel Engineering Based on Microseismic Monitoring

et al. 2021

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Due to the different geological conditions and construction methods associated with different projects, rockbursts in deep-buried tunnels often present different precursor characteristics, bringing major challenges to the early warning of rockbursts. To adapt to the complexity of engineering, it is necessary to review the latest advancements in rockburst early warning and to discuss general early warning methods. In this article, first, microseismic monitoring and localization methods applicable under tunneling construction are reviewed. Based on the latest engineering examples and research progress, the microseismic evolution characteristics of the rockburst formation process are summarized, and the formation process and mechanism of structure-type and delayed rockbursts are analyzed. The different methods for predicting the risk and level of rockbursts using microseismic indices are reviewed, and the implementation methods and application cases for predicting potential rockburst areas and rockburst probability based on a mechanical model are expounded. Finally, combined with the new practice in early warning methods, development directions for the early warning of rockbursts are put forward.

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“…At present, a large number of techniques such as microseismic monitoring and the stable electric field method have been used to interpret and characterize the propagation morphology of hydraulic fractures. However, these monitoring methods need to pay huge human and economic costs for the arrangement, use, and maintenance of equipment, and the data accuracy of monitoring results still cannot well meet the needs of fracture parameter design (Cai et al, 2018;Liang et al, 2020). Fracture propagation simulation technology is a computer numerical calculation method developed based on the basic theories of fracture mechanics, elasticity, rock mechanics, and seepage mechanics.…”

Section: Introductionmentioning

confidence: 99%

Simulation Study on Interactive Propagation of Hydraulic Fractures and Natural Fractures in Shale Oil Reservoir

et al. 2022

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Natural fractures are developed in the shale oil reservoir, and the hydraulic fracture (HF) morphology is complex. The fracture shape can be inverted by using fracture propagation numerical simulation technology, which provides guidance for fracturing parameter design and fracturing process optimization. However, the existing models still have many deficiencies in the interactive propagation mechanism of HF and natural fracture (NF). Based on the three interactive modes of HF and NF (HF propagation without NF, HF propagation with full NF, and HF propagation with half NF), this work establishes the fracture propagation model and puts forward the simulation calculation method. The Brinkman equation is used to modify the leakage model based on Darcy’s law, and G1701H well is taken as an example to simulate the fracture propagation law under different interaction modes. The research shows that there is a transition region between the HF wall and rock matrix. The greater the porosity and permeability of the rock matrix, the more significant the influence of the transition region on leakage. The NF zone will change the propagation direction of the main fracture. When there are multiple clusters of fractures in the same fracturing section, only some HFs meet with natural fractures, and it is easy to form a “T”-shaped fracture network. The results improve the existing hydraulic fracturing model and provide help for fracturing parameter design and fracture parameter inversion of the shale oil reservoir.

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Characterizing rockbursts and analysis on frequency-spectrum evolutionary law of rockburst precursor based on microseismic monitoring

Cited by 65 publications

References 31 publications

Mechanism and Inducing Factors of Rockburst Events of Roadways Under Ultrathick Strata

Mechanism and Inducing Factors of Rockburst Events of Roadways Under Ultrathick Strata

Review on Early Warning Methods for Rockbursts in Tunnel Engineering Based on Microseismic Monitoring

Simulation Study on Interactive Propagation of Hydraulic Fractures and Natural Fractures in Shale Oil Reservoir

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