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Geomechanics and Engineering
  Volume 12, Number 4, April 2017, pages 595-609
DOI: http://dx.doi.org/10.12989/gae.2017.12.4.595
 


Field monitoring of splitting failure for surrounding rock masses and applications of energy dissipation model
Zhi-shen Wang, Yong Li, Wei-shen Zhu, Yi-guo Xue, Bei Jiang and Yan-bo Sun

 
Abstract
    Due to high in-situ stress and brittleness of rock mass, the surrounding rock masses of underground caverns are prone to appear splitting failure. In this paper, a kind of loading-unloading variable elastic modulus model has been initially proposed and developed based on energy dissipation principle, and the stress state of elements has been determined by a splitting failure criterion. Then the underground caverns of Dagangshan hydropower station is analyzed using the above model. For comparing with the monitoring results, the entire process of rock splitting failure has been achieved through monitoring the splitting failure on side walls of large-scale caverns in Dagangshan via borehole TV, micro-meter and deformation resistivity instrument. It shows that the maximum depth of splitting area in the downstream sidewall of the main power house is approximately 14 m, which is close to the numerical results, about 12.5 m based on the energy dissipation model. As monitoring result, the calculation indicates that the key point displacement of caverns decreases firstly with the distance from main powerhouse downstream side wall rising, and then increases, because this area gets close to the side wall of main transformer house and another smaller splitting zone formed here. Therefore it is concluded that the energy dissipation model can preferably present deformation and fracture zones in engineering, and be very useful for similar projects.
 
Key Words
    high geostress; underground cavern group; splitting failure; in-situ monitoring; energy dissipation; opening displacement
 
Address
(1) Zhi-shen Wang, Yong Li, Wei-shen Zhu, Yi-guo Xue, Bei Jiang:
Geotechnical & Structural Engineering Research Center, Shandong University, No. 17923 Jingshi Rd., Jinan, Shandong Province, P.R. China;
(2) Yong Li:
School of Civil Engineering, Shandong University, No. 17922 Jingshi Rd., Jinan, Shandong Province, P.R. China;
(3) Yan-bo Sun:
Shandong Luqiao Group CO. LTD, No. 330 Jingwu Road Jinan, P.R. China.
 

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