Case Histories of Four Extremely Intense Rockbursts in Deep Tunnels

Zhang, Chuanqing; Feng, Xia‐Ting; Zhou, Hui; Qiu, Shili; Wu, Wenzhong

doi:10.1007/s00603-011-0218-6

Cited by 286 publications

(83 citation statements)

References 8 publications

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“…4 shows other tunnel failures induced by intense strainbursts. Based on the characteristics and mechanisms of these strainbursts, four typical events were selected, and their temporal and spatial characteristics were described by Zhang et al (2012b). Other details about the rockbursts in the deep tunnels of the Jinping II project can be found in related references (Chen et al 2015;Li et al 2012a).…”

Section: Strainburst Characteristic Analysis For the Jinping II Projectmentioning

confidence: 99%

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Microseismic Monitoring of Strainburst Activities in Deep Tunnels at the Jinping II Hydropower Station, China

Dai

et al. 2015

Rock Mech Rock Eng

119

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Rockbursts were frequently encountered during the construction of deep tunnels at the Jinping II hydropower station, Southwest China. Investigations of the possibility of rockbursts during tunnel boring machine (TBM) and drilling and blasting (D&B) advancement are necessary to guide the construction of tunnels and to protect personnel and TBM equipment from strainburst-related accidents. A real-time, movable microseismic monitoring system was installed to forecast strainburst locations ahead of the tunnel faces. The spatiotemporal distribution evolution of microseismic events prior to and during strainbursts was recorded and analysed. The concentration of microseismic events prior to the occurrence of strainbursts was found to be a significant precursor to strainbursts in deep rock tunnelling. During a 2-year microseismic investigation of strainbursts in the deep tunnels at the Jinping II hydropower station, a total of 2240 strainburst location forecasts were issued, with 63 % correctly forecasting the locations of strainbursts. The successful forecasting of strainburst locations proved that microseismic monitoring is essential for the assessment and mitigation of strainburst hazards, and can be used to minimise damage to equipment and personnel. The results of the current study may be valuable for the construction management and safety assessment of similar underground rock structures under high in situ stress.

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Section: Strainburst Characteristic Analysis For the Jinping II Projectmentioning

confidence: 99%

“…Location and layout of tunnels in the Jinping II hydropower station (reproduced fromLi et al 2011Li et al , 2012aZhang et al 2012b;Xu et al 2011) N. W.Xu et al …”

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confidence: 99%

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Microseismic Monitoring of Strainburst Activities in Deep Tunnels at the Jinping II Hydropower Station, China

Dai

et al. 2015

Rock Mech Rock Eng

119

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“…For instance, it was found that pillar bursts occurred after blasting in some deep gold mines in South Africa (Malan 1999). Some extremely intense rockbursts occurred when actually there were no excavation activities at the tunnel face at Jinping II hydropower station in China (Li et al 2012;Zhang et al 2012). For instance, 38 delayed rockbursts were recorded and the longest delayed rockburst was recorded 163 d after the excavation .…”

Section: Introduction Introduction Introduction Introductionmentioning

confidence: 99%

Influence of strain energy released from a test machine on rock failure process

Cai

2018

Can. Geotech. J.

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Abstract AbstractRock instability occurs if the energy supplied to the rock failure process is excess. The theoretical analysis on the energy transfer in rock failure process revealed that the rock failure process is a result of the strain energy released from the test machine or the surrounding rock masses of wall rock, plus the additional energy input from an external energy source if the deformation of the rock is continued and driven by the external energy source. The strain energy released from the test machine is focused in this study because it is responsible for some of the unstable rock failures in laboratory testing. A FEM-based numerical experiment was carried out to study the strain energy released from test machines under different loading conditions of LSS.The modeling results demonstrated that depending on the LSS of a test machine, the strain energy Accumulative energy input from an external energy source at peak load E r Accumulative energy consumed in a rock specimen at peak load E t Strain energy stored in a test machine at peak load E in * Accumulative energy input from an external energy source at post-peak deformation stage E r * Accumulative energy consumed in a rock specimen at post-peak deformation stage E t * Strain energy stored in a test machine at post-peak deformation stage ∆E in Energy input from an external energy source during post-peak deformation stage ∆E r Energy consumed in a rock specimen during post-peak deformation stage ∆E t Strain energy released from a test machine during post-peak deformation stage ∆E r B Energy item ∆E r under the ideal loading condition E p Post-peak stiffness of a rock specimen in stress-strain curve H Height of a column-shaped structure k Longitudinal stiffness of a column-shaped structure λ Post-peak stiffness of a rock specimen (absolute value)

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“…During the tunneling of the headrace tunnels at the Jinping II hydropower station, a large amount of intense rockbursts occurred not only causing casualties and equipment troubles, but also resulting in many problems like project delays [10]. As is well known, rockbursts have extremely complicated evolution mechanisms [11][12][13].…”

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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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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Case Histories of Four Extremely Intense Rockbursts in Deep Tunnels

Cited by 286 publications

References 8 publications

Microseismic Monitoring of Strainburst Activities in Deep Tunnels at the Jinping II Hydropower Station, China

Microseismic Monitoring of Strainburst Activities in Deep Tunnels at the Jinping II Hydropower Station, China

Influence of strain energy released from a test machine on rock failure process

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

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