Microseismicity Characteristics Before and After a Rockburst and Mechanisms of Intermittent Rockbursts in a Water Diversion Tunnel

2021 ◽  
Author(s):  
Yucheng Wang ◽  
Chun’an Tang ◽  
Liexian Tang ◽  
Shichao Zhang ◽  
Limin Li ◽  
...  
Keyword(s):  
Water Diversion ◽  
Diversion Tunnel ◽  
Before And After

Study on Rockburst Intensity Prediction Based on Efficacy Coefficient Method

2013 ◽  
Vol 353-356 ◽  
pp. 1277-1280 ◽  
Author(s):  
Dao Hong Qiu ◽  
Shu Cai Li ◽  
Le Wen Zhang
Keyword(s):  
Tensile Strength ◽  
Water Diversion ◽  
Hydropower Station ◽  
Energy Index ◽  
Affecting Factors ◽  
Diversion Tunnel ◽  
Evaluation Indexes ◽  
Intensity Prediction ◽  
Efficacy Coefficient Method ◽  
Coefficient Method

Based on the basic principle of the efficacy coefficient method, a model of rockburst intensity prediction was established. Considering the key affecting factors of rockburst, three factors were selected as evaluation indexes including the ratio of maximum tangential stress and rock uniaxial compressive strength, the ratio of compressive and tensile strength of rock and elastic energy index. Finally, the model was applied to the rockburst prediction of water diversion tunnel of Jiangbian hydropower station and the results show that the method is reliable, and it provids a new idea to predict rockburst.

Detecting evolution trends in the recorded runoffs from the major rivers in China during 1950–2010

2013 ◽  
Vol 4 (3) ◽  
pp. 252-264 ◽  
Author(s):  
G. Q. Wang ◽  
X. L. Yan ◽  
J. Y. Zhang ◽  
C. S. Liu ◽  
J. L. Jin ◽  
...  
Keyword(s):  
Water Conservation ◽  
Yellow River ◽  
Sustainable Use ◽  
Kendall Test ◽  
Water Diversion ◽  
Adaptation To Climate Change ◽  
Runoff Series ◽  
Abrupt Changes ◽  
Before And After ◽  
Conservation Projects

Evolution trends as well as abrupt changes in recorded runoffs from the major rivers in China during 1950–2010 were investigated using the Mann–Kendall test and ordered clustering analysis. Results show that the recorded runoff series at ten key hydrometric stations on the major rivers in China are characterized by a general decreasing trend. A significant decrease has occurred at six stations: Yichang, Huayuankou, Guantai, Shixiali, Tieling and Haerbin stations, which are located on the northern major rivers. Abrupt changes in runoff series are detectable for the Yellow River (1986), the Hai River (1965 at Guantai station, 1970 at Shixiali station) and the Liao River (1965). The relationship between runoff and precipitation at these stations is different before and after the abrupt change. Intensive human activities, such as land use change, water conservation projects, water diversion projects and rapid increases in agricultural irrigation, are likely to be among the main causes of the abrupt changes in runoff. Effective strategies for water conservation and adaptation to climate change will be needed to ensure sustainable use of water resources and safeguard economic growth under China's 12th 5-year plan.

Research on Generating Mechanism and Treatment Measures of Concrete Bubbles

2012 ◽  
Vol 174-177 ◽  
pp. 645-650
Author(s):  
Hai Meng ◽  
Zhi Feng Li ◽  
Bi Zhen Chen
Keyword(s):  
Concrete Surface ◽  
Water Diversion ◽  
Common Phenomenon ◽  
Construction Process ◽  
Diversion Tunnel ◽  
Engineering Construction ◽  
Air Bubble ◽  
Treatment Measures ◽  
Concrete Service ◽  
Surface Bubble

Concrete bubble is a common phenomenon in the concrete construction process. Generation and existence of concrete air bubble not only influence the concrete appearance, but also affects concrete service life. Especially for concrete surface with high requirements just as water diversion tunnel, concrete bubble gradually raises concern of engineering construction parties. Engineering technical personnel take a number of measures to eliminate concrete surface bubble in project practice. Based on analysis of many bubble elimination methods, generating mechanism and treatment measures of concrete bubble are discussed, providing reference for eliminating concrete bubbles.

scholarly journals Santa Giusta Lagoon (Sardinia): phytoplankton and nutrients before and after waste water diversion

2001 ◽  
Vol 60 (2) ◽  
Author(s):  
Nicola SECHI ◽  
Fatima FIOCCA ◽  
Antonietta SANNIO ◽  
Antonella LUGLIÈ
Keyword(s):  
Waste Water ◽  
Water Diversion ◽  
Before And After

Shallow lake water exchange process before and after water diversion projects as affected by wind field

2021 ◽  
Vol 592 ◽  
pp. 125785
Author(s):  
Fangjun Peng ◽  
Kefeng Li ◽  
Ruifeng Liang ◽  
Xintong Li ◽  
Peng Zhang ◽  
...  
Keyword(s):  
Lake Water ◽  
Shallow Lake ◽  
Wind Field ◽  
Water Exchange ◽  
Exchange Process ◽  
Water Diversion ◽  
Before And After

Researches on the Stability of Deeply-Buried Water Diversion Tunnel Based on Strength Reduction Method

2013 ◽  
Vol 303-306 ◽  
pp. 2876-2879
Author(s):  
He Jun
Keyword(s):  
Safety Factor ◽  
Reduction Method ◽  
Relative Displacement ◽  
Scientific Basis ◽  
Strength Reduction ◽  
Water Diversion ◽  
Strength Reduction Method ◽  
Diversion Tunnel ◽  
The Stability ◽  
Coulomb Criterion

In view of the complexity of the deeply-buried water diversion tunnel and adopting the advantage of slope strength reduction method, this research takes advantage of strength reduction method to study the stability of diversion tunnel. Based on the instance of Jinping II hydropower, this paper analyzes Yantang Formation III surrounding rocks buried 2500m deep below the ground, adopts the Mohr-Coulomb criterion, takes the cavern displacements or relative displacement as buckling critical criterion, and finally concludes that the safety factor is 1.5 in this instance, not far from 1.2 in the norm. It is thus reasonable to use strength reduction method to study the stability of the deeply-buried water diversion tunnel. The method can get safety factor easily and objectively and can provide scientific basis for evaluating the deeply-buried water diversion tunnel and the design for the supporting structure.

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