Rockburst characteristics and microseismic monitoring of deep-buried tunnels for Jinping II Hydropower Station

Ma, Tianhui; Tang, Chun An; Tang, Liexian; Zhang, W.D.; Wang, L.

doi:10.1016/j.tust.2015.04.016

Cited by 184 publications

(64 citation statements)

References 18 publications

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“…It is really a tough task to distinguish the MS signals from the complex signals. Di erent types of signals such as electric current, knocking, rock drilling machine, TBM, ventilating fan, locomotive horn, blasting, MS event, and rockburst were recorded by MS monitoring system listed in Table 2 [35]. Based on wave features in the time domain and frequency domain, the waveform recognition was implemented, and the various undesired noise signals were ltered to obtain the signals of MS events and rockbursts.…”

Section: Waveform Recognition and Noisementioning

confidence: 99%

“…Chen et al [34] selected the radiated energy obtained by MS monitoring as an index for the intensity evaluation of rockbursts and put forward a new set of criteria to classify the rockburst intensity quantitatively by utilizing the radiated energy and surrounding rock damage severity. Ma et al [35] investigated the spatial and temporal evolution of the associated MS activities along with the rockbursts which was encountered at the Jinping II hydropower station through the parameter of MS event density. Using cumulative number and cumulative energy of MS events, Feng et al [36] studied the MS time-sequences accompanying rockburst development processes at the Jinping deep-buried tunnels.…”

Section: Introductionmentioning

confidence: 99%

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Microseismic Monitoring of Energy Changes in Deep Tunnels during the TBM Tunneling of the Jinping II Hydropower Station

Zhuang

Tang

et al. 2018

Advances in Civil Engineering

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e TBM tunneling at the Jinping II hydropower station in Southwest China has received extensive concerns around the world because of its large engineering scale and the high rockburst risks faced in the tunnel advancement. e associated energy changes of rockbursts and control method for safe TBM tunneling are to be further investigated. A movable microseismic (MS) monitoring system was established to capture the MS events and rockbursts when the TBM excavated the headrace tunnel #1 at the Jinping II hydropower station. e spatial and temporal patterns of the energy changes in the tunnel rock masses were studied. Meanwhile, the evolution of a rockburst encountered in front of the TBM excavation face was revealed, and the performance of the top pilot tunnel method on the reduction of the rockburst risks in the headrace tunnel #1 was evaluated based on the energy changes of the surrounding rock masses. It can be concluded that energy accumulation and energy release firstly occurred in the surrounding rock masses at the southern end of the top pilot tunnel section of the headrace tunnel #1. en, energy transference of the rock masses took place from the southern end to northwest of the top pilot tunnel giving rise to the occurrence of a moderate rockburst about 30 m in front of the tunnel. However, no rockbursts appeared when the TBM excavated through the top pilot tunnel section of the headrace tunnel #1. erefore, the top pilot tunnel method really works in reducing the risks of rockbursts during the TBM tunneling in deep tunnels.

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Section: Waveform Recognition and Noisementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microseismic Monitoring of Energy Changes in Deep Tunnels during the TBM Tunneling of the Jinping II Hydropower Station

Zhuang

Tang

et al. 2018

Advances in Civil Engineering

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“…Rockburst is the most prominent deep rock mechanics problem for deep and long tunnels. Rockburst not only destroys underground structures and equipment, but also threatens human safety [16].…”

Section: Introductionmentioning

confidence: 99%

A Review of the Transient Process and Control for a Hydropower Station with a Super Long Headrace Tunnel

Guo

Zhu

2018

Energies

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The hydropower station with a super long headrace tunnel is a significant development type for hydropower energy. By constructing a super long headrace tunnel, the huge natural water fall head can be utilized to generate more electricity. With the development of hydropower energy, a hydropower station with a super long headrace tunnel becomes more and more competitive. Compared with a hydropower station with a short headrace tunnel, the transient process and control for a hydropower station with a super long headrace tunnel is much more complicated and becomes an intractable challenge. It is well known that the transient process and control is the basis of the design and operation of a hydropower station. To overcome the challenge of the transient process and control, much research has been carried out. This paper provides a systematic review on the latest research progress of the transient process and control for hydropower stations with a super long headrace tunnel. Firstly, two key issues for the transient process and control, i.e., hydraulic design optimization of the surge tank and operation control of unit, are illuminated. Secondly, for both single surge tanks and surge tanks with special types or combinations, the hydraulic design optimization methods are described. The most disadvantageous design and advantageous operation of surge tanks under combined operating conditions are discussed. Thirdly, the stability and regulation quality of the hydro-turbine governing system under isolated and grid-connected operation conditions are presented. Finally, some trends and recommendations for future research directions are made. A research thought for establishing the complete theory and application system of the transient process and control for hydropower stations with a super long headrace tunnel from the perspective of multi-slice and multi-scale is proposed.

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“…Microseismic monitoring was also employed along the left bank slope of the Jinping-I Hydropower Station to analyse the stability of the slope and investigate the deformation of deep rock masses in particular [17]. Furthermore, Ma et al [18] utilized microseismic monitoring technology to reveal the spatial and temporal variations in microseismic and rockburst activities in deepburied tunnels for the Jinping-II Hydropower Station.…”

Section: Introductionmentioning

confidence: 99%

Research on the Law of Large-Scale Deformation and Failure of Soft Rock Based on Microseismic Monitoring

Chen

Tang

et al. 2018

Advances in Civil Engineering

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Based on the existing Canadian ESG microseismic monitoring system, a mobile microseismic monitoring system for a soft rock tunnel has been successfully constructed through continuous exploration and improvement to study the large-scale nucleation and development of microfractures in the soft rock of the Yangshan Tunnel. All-weather, continuous real-time monitoring is conducted while the tunnel is excavated through drilling and blasting, and the waveform characteristics of microseismic events are analysed. rough the recorded microseismic monitoring data, the variation characteristics of various parameters (e.g., the temporal, spatial, and magnitude distributions of the microseismic events, the frequency of microseismic events, and the microseismic event density and energy) are separately studied during the process of large-scale deformation instability and failure of the soft rock tunnel. e relationship between the deterioration of the rock mass and the microseismic activity during this failure process is consequently discussed. e research results show that a microseismic monitoring system can be used to detect precursors; namely, the microseismic event frequency and energy both will appear "lull" and "active" periods during the whole failure process of soft rock tunnel. Two peaks are observed during the evolution of failure. When the second peak occurs, it is accompanied by the destruction of the surrounding rock. e extent and strength of the damage within the surrounding rock can be delineated by the spatial, temporal, and magnitude distributions of the microseismic events and a microseismic event density nephogram. e results of microseismic analysis confirm that a microseismic monitoring system can be used to monitor the largescale deformation and failure processes of a soft rock tunnel and provide early warning for on-site construction workers to ensure the smooth development of the project.

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Rockburst characteristics and microseismic monitoring of deep-buried tunnels for Jinping II Hydropower Station

Cited by 184 publications

References 18 publications

Microseismic Monitoring of Energy Changes in Deep Tunnels during the TBM Tunneling of the Jinping II Hydropower Station

Microseismic Monitoring of Energy Changes in Deep Tunnels during the TBM Tunneling of the Jinping II Hydropower Station

A Review of the Transient Process and Control for a Hydropower Station with a Super Long Headrace Tunnel

Research on the Law of Large-Scale Deformation and Failure of Soft Rock Based on Microseismic Monitoring

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