A true 3D physical model test study on the stability of an underground cavern group in Shuangjiangkou Hydropower Station

Weishen Zhu, Lei Zhang, Li Yong, Qianbing Zhang

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

Abstract

Taking the underground caverns of Shuangjiangkou (SJK) Hydropower Station as an engineering background, a large-scale true 3D physical model test is performed to study the stability of the enclosing rock masses, including the analogous material, the steel structure frame, fabrications of rock bolts and cables, development of the measuring techniques, fabrication of the physical model, excavations and the overload test. The developed steel structure can simulate the complicated circumstances just like high in-situ stress and high overburden depth. It also can apply the true 3D loading on six surfaces of the physical model. Many combinational ball sliding blocks are installed between model surface and the structural wall to reduce the friction between the contact surfaces. During the model construction, precast blocks are used and monitoring holes are predefined before the analogous material is piled up. A unique grouting technique and prestressed cables are adopted in the model test. A digital photogrammetric technique, displacement sensing bars based on Fiber Bragg Gratings (FBG) technology, and mini extensometers are developed and adopted for measuring the deformation in the process of excavations. The overload tests are accomplished under the conditions of different overburden depths. The results of this research will make certain guiding significance to the practical engineering.

Original languageEnglish
Title of host publicationFourth International Conference on Experimental Mechanics
Volume7522
DOIs
Publication statusPublished - 2010
Externally publishedYes
EventInternational Conference on Experimental Mechanics 2009 - Singapore, Singapore
Duration: 18 Nov 200920 Nov 2009
Conference number: 4th
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/7522.toc (Proceedings)

Conference

ConferenceInternational Conference on Experimental Mechanics 2009
Abbreviated titleICEM 2009
Country/TerritorySingapore
CitySingapore
Period18/11/0920/11/09
Internet address

Keywords

  • Measuring techniques
  • Overloading test
  • Physical model test
  • Steel structural frame
  • Underground cavern group

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