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Transverse Cracks Cause Analysis on Rock-Anchored Beam During the Construction Process of Hydropower Station Underground Powerhouse

Conference paper
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Part of the Sustainable Civil Infrastructures book series (SUCI)

Abstract

The different size of transverse cracks was appeared on the upper surface of rock-anchored beam in the process of excavation of underground powerhouse of hydropower station. Detailed cause analysis of these cracks was made based on the in situ geological condition, construction process, monitoring data, geophysical survey and numerical simulation. The results showed that the layered rock and faults are the premise of differential deformation of surrounding rock. Monitoring data and geophysical test results indicated that sidewall surficial surrounding rock was cracked by the blasting excavation which promoted the differential deformation of surrounding rock, easy to the generation of transverse crack on rock-anchor beam. Numerical analysis results revealed that differential vertical deformation of surrounding rock is the most important reason for the rock-anchored beam transverse cracks while the lithological differences as well as the existence of the faults are the main reason for the differences on the vertical deformation. The procedure of excavation and the nearby cavern excavation which resulted stress redistribution and differences on the deformation also leaded to another cause of rock-anchored beam transverse crack.

Keywords

Transverse Cracks Surrounding Rock Geophysical Tests Main Powerhouse Bolt Stress 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

The financial supports from the National Natural Science Foundation of China (No. 41602320) are gratefully acknowledged. We also like to acknowledge the reviewers for their constructive remarks.

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2019

Authors and Affiliations

  1. 1.State Key Laboratory of Geomechanics and Geotechnical EngineeringInstitute of Rock and Soil Mechanics, Chinese Academy of ScienceWuhanChina
  2. 2.Northwest Engineering Corporation LimitedXianChina
  3. 3.Huaneng Lancang River Hydropower Corporation LimitedKunmingChina

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