Deformation and Stability Analysis of Surrounding Rock Mass in Deep Underground Cavern Based on Microseismic monitoring and Numerical Modelling

The large and medium-sized hydropower projects underground cavern group are basically in relatively integrate surrounding rock, so there are few engineering examples in layered surrounding rock with type III surrounding rocks as the main rock, and lack of successful experience. According to rock-bolted crane girder under the layered surrounding rock of a large underground power station, analyzing prototype dynamic monitoring data of the excavation, unloading and load-bearing test .The distribution of the monitoring data conforms to the normal law, and there are no large outliers, under the action of a large number of bolts, rock-bolted crane girder basically forms a good integrity with the layered surrounding rock, and the load-bearing test has no effect on the stress condition and stability condition of surrounding rock.

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Establishment and Application of Microseismic Monitoring System to Deep-Buried Underground Powerhouse

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.838-841.889 ◽

2013 ◽

Vol 838-841 ◽

pp. 889-893

Author(s):

Biao Li ◽

Feng Dai ◽

Nu Wen Xu ◽

Chun Sha

Keyword(s):

Rock Mass ◽

Monitoring System ◽

Wave Velocity ◽

Microseismic Monitoring ◽

Surrounding Rock ◽

P Wave ◽

Monitoring Method ◽

Underground Powerhouse ◽

Geological Conditions ◽

The Stability

The right bank underground powerhouse of Houziyan hydropower station is a typical deep-buried type with high geostress and complicated geological conditions. To monitor and analyze the stability of surrounding rock mass during continuous excavation of the powerhouse excavation and locate the potential failure zones, an ESG (Engineering Seismology Group) microseismic monitoring system manufactured in Canada was installed in April, 2013. The wave velocity of the monitoring system was determined through fixed blasting tests. And the average location error is the minimum while P-wave velocity is 5700m/s, less than 10m and meeting the system request. By combining the temporal and spatial distribution regularity of microseimic events with field excavation, micro-crack clusters and potential instability zones were identified and delineated. The results will provide a reference for later excavations and supports of the underground powerhouse. Furthermore, a new monitoring method can also be supplied for the stability analysis of surrounding rock mass in deep-buried underground powerhouses.

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Stability analysis of underground surrounding rock mass based on block theory

Journal of Central South University ◽

10.1007/s11771-020-4527-3 ◽

2020 ◽

Vol 27 (10) ◽

pp. 3040-3052

Author(s):

Jian-yun Lin ◽

Yu-jun Zuo ◽

Jian Wang ◽

Lu-jing Zheng ◽

Bin Chen ◽

...

Keyword(s):

Rock Mass ◽

Stability Analysis ◽

Surrounding Rock ◽

Block Theory

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Stability Analysis of Surrounding Rock with Two Groups Parallel Joints Using DDARF Method

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.919-921.735 ◽

2014 ◽

Vol 919-921 ◽

pp. 735-739

Author(s):

Hai Ping Ma ◽

Li Ge Wang ◽

Xue Wei Li

Keyword(s):

Stability Analysis ◽

Uniaxial Compression ◽

Surrounding Rock ◽

Discontinuous Deformation Analysis ◽

Deformation Analysis ◽

Compression Tests ◽

Underground Cavern ◽

Excavation Process ◽

Discontinuous Deformation ◽

The Stability

In order to analyze the stability of surrounding rocks with two groups parallel joints under different angles, a new method, DDARF (discontinuous deformation analysis for rock failure) program was adopted to investigate three cases of uniaxial compression tests of two groups parallel joints sample with the angels 30, 45 and 60. The results show the sample with 30 is least prone to be destroyed and the sample with 60 are most likely to be destroyed. Then DDARF program was also applied to investigate the underground cavern excavation process of two groups parallel joints surrounding rocks with the angels 30, 45 and 60. The results show that the stability of underground cavern with joint angel of 60 is worst in the aspect of stability.

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