Evaluation of rock slope stability for Yujian River dam site China by block theory analyses

P. H.S.W. Kulatilake, L. Q. Wang, H. M. Tang, Y. Liang

Research output: Contribution to conferencePaperpeer-review


Lithological information, rock mass fracture data and discontinuity shear strength obtained through field investigations have been used to conduct block theory analyses for the rock slopes that exist in the dam site to evaluate the stability of the slopes. The analyses were performed using mean discontinuity set orientations for each rock mass region under gravitational loading to calculate the maximum safe slope angles (MSSA) for different cut slope directions. The following conclusions have been made based on the block theory analysis results: (1) The final MSSA range between 30° and 47°, 44° and 70°, 47° and 69°for cut slope dip directions of 20°-30°, 105°-210°, and 270°-355°, respectively; (2) For cut slope dip directions of 105°-210° and 270°-355°, wide ranges of values have been obtained for the final MSSA reflecting the influence of variability of fracture orientations on MSSA; (3) Apart from the region R-d-1 for slope dip directions in the range 20°-30°, rest of the regions at the dam site seem to be stable for slope angles less than 40°.

Original languageEnglish (US)
StatePublished - 2011
Externally publishedYes
Event45th US Rock Mechanics / Geomechanics Symposium - San Francisco, CA, United States
Duration: Jun 26 2011Jun 29 2011


Other45th US Rock Mechanics / Geomechanics Symposium
Country/TerritoryUnited States
CitySan Francisco, CA


  • Block theory analysis
  • Dam site
  • Discontinuity shear strength
  • Rock discontinuities
  • Rock slope stability
  • Yujian River

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics


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