Brittle failure due to excavation induced stress change – a case study of Jinping II Hydropower Station

2010 ◽  
pp. 589-594 ◽  
Author(s):  
C Cheng ◽  
X Sun
Keyword(s):  
Brittle Failure ◽  
Stress Change ◽  
Hydropower Station ◽  
Induced Stress ◽  
Jinping Ii Hydropower Station

Rock mass damage induced by rockbursts occurring on tunnel floors: a case study of two tunnels at the Jinping II Hydropower Station

2013 ◽  
Vol 71 (1) ◽  
pp. 441-450 ◽  
Author(s):  
Chuanqing Zhang ◽  
Xia-Ting Feng ◽  
Hui Zhou ◽  
Shili Qiu ◽  
Yanshuang Yang
Keyword(s):  
Rock Mass ◽  
Hydropower Station ◽  
Jinping Ii Hydropower Station

Characteristics of Microseismicity during Breakthrough in Deep Tunnels: Case Study of Jinping-II Hydropower Station in China

2020 ◽  
Vol 20 (2) ◽  
pp. 04019163 ◽  
Author(s):  
Guang-Liang Feng ◽  
Xia-Ting Feng ◽  
Bing-Rui Chen ◽  
Ya-Xun Xiao ◽  
Guo-Feng Liu ◽  
...  
Keyword(s):  
Hydropower Station ◽  
Jinping Ii Hydropower Station

scholarly journals Rockburst Prediction From the Perspective of Energy Release: A Case Study of a Diversion Tunnel at Jinping II Hydropower Station

2021 ◽  
Vol 9 ◽  
Author(s):  
Yong Fan ◽  
Xianze Cui ◽  
Zhendong Leng ◽  
Junwei Zheng ◽  
Feng Wang ◽  
...  
Keyword(s):  
Rock Mass ◽  
Energy Release ◽  
Brittle Failure ◽  
Strain Energy ◽  
Hydropower Station ◽  
Deep Tunnel ◽  
Local Energy ◽  
Diversion Tunnel ◽  
Jinping Ii Hydropower Station

As a man-made engineering hazard, it is widely accepted that the rockbursts are the result of energy release. Previous studies have examined the unloading of in-situ stress resulting from deep tunnel excavation as a quasi-static process but the transient stress variation during excavation has received less attention. This research discusses rockbursts that happened during the construction of a diversion tunnel at Jinping II hydropower station. The brittle-ductile-plastic (BDP) transition property of Jinping marble was numerically described by the Hoek-Brown strength criterion, and the dynamic energy release process derived from the transient unloading of in-situ stress was studied using an index, local energy release rate. Studies have shown that, due to transient unloading, the strain energy of the surrounding rock mass goes through a dynamic process of decreasing at first, increasing second, then reducing before finally stabilizing. The first decrease of strain energy results from elastic unloading waves and does not cause brittle failure in rock masses, which is consistent with the elastic condition but the secondary reduction of strain energy is because the accumulated strain energy in rock masses exceeds the storage limit, which will inevitably trigger the brittle failure in the rock mass. Thus, the shorter the distance to the tunnel wall the bigger and more intense the energy release. Finally, a relationship between the average value of the local energy release rate and the rockburst intensity was established to assess the risk of rockburst induced by the blasting excavation of a deep tunnel.

scholarly journals The Tale of an Intake Vortex and Its Mitigation Countermeasure: A Case Study from Akkats Hydropower Station

Water ◽  
2018 ◽  
Vol 10 (7) ◽  
pp. 881 ◽  
Author(s):  
James Yang ◽  
Patrik Andreasson ◽  
Carl-Maikel Högström ◽  
Penghua Teng
Keyword(s):  
Hydropower Station
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