Geomechanics and Engineering

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Numerical investigations on stability evaluation of a jointed rock slope during excavation using an optimized DDARF method

  • Li, Yong (Geotechnical & Structural Engineering Research Center, Shandong University) ;
  • Zhou, Hao (Geotechnical & Structural Engineering Research Center, Shandong University) ;
  • Dong, Zhenxing (Geotechnical & Structural Engineering Research Center, Shandong University) ;
  • Zhu, Weishen (Geotechnical & Structural Engineering Research Center, Shandong University) ;
  • Li, Shucai (Geotechnical & Structural Engineering Research Center, Shandong University) ;
  • Wang, Shugang (Geotechnical & Structural Engineering Research Center, Shandong University)
  • Received : 2016.12.08
  • Accepted : 2017.07.24
  • Published : 2018.02.28
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Abstract

A jointed rock slope stability evaluation was simulated by a discontinuous deformation analysis numerical method to investigate the process and safety factors for different crack distributions and different overloading situations. An optimized method using Discontinuous Deformation Analysis for Rock Failure (DDARF) is presented to perform numerical investigations on the jointed rock slope stability evaluation of the Dagangshan hydropower station. During the pre-processing of establishing the numerical model, an integrated software system including AutoCAD, Screen Capture, and Excel is adopted to facilitate the implementation of the numerical model with random joint network. These optimizations during the pre-processing stage of DDARF can remarkably improve the simulation efficiency, making it possible for complex model calculation. In the numerical investigations on the jointed rock slope stability evaluations using the optimized DDARF, three calculation schemes have been taken into account in the numerical model: (I) no joint; (II) two sets of regular parallel joints; and (III) multiple sets of random joints. This model is capable of replicating the entire processes including crack initiation, propagation, formation of shear zones, and local failures, and thus is able to provide constructive suggestions to supporting schemes for the slope. Meanwhile, the overloading numerical simulations under the same three schemes have also been performed. Overloading safety factors of the three schemes are 5.68, 2.42 and 1.39, respectively, which are obtained by analyzing the displacement evolutions of key monitoring points during overloading.

Keywords

Acknowledgement

Supported by : Shandong Provincial Natural Science Foundation, China, Shandong University, China Scholarship Council

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