›› 2018, Vol. 39 ›› Issue (1): 287-296.doi: 10.16285/j.rsm.2016.0049

• Geotechnical Engineering • Previous Articles     Next Articles

Classification of rock mass structure of dam foundation based on 3D joint network simulation

NI Wei-da1, 2, SHAN Zhi-gang1, LIU Xiao3   

  1. 1. PowerChina Huadong Engineering Corporation Limited, Hangzhou, Zhejiang 310014, China; 2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 3. Three Gorges Research Center for Geohazard, Ministry of Education, China University of Geosciences, Wuhan, Hubei 430074, China
  • Received:2016-01-06 Online:2018-01-10 Published:2018-06-06
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (41572279).

Abstract: Based on the 3D joint network simulation, the structure classification was carried out on the left bank dam foundation in Baihetan hydropower station on Jinsha River. Firstly, the dam foundation was separated into several statistical homogeneous subsections, according to the group distribution and density distribution of joints. Then, a 3D joint network model was established for each subsection by considering the statistics and probability theory. Secondly, uniform angle rotating measuring-lines were arranged on the positive, side and top surfaces of the model, respectively. Subsequently, a certain RBI value of each line and 3 rose diagrams for each orthogonal surface were obtained. Finally, the mean value of these RBIs from 54 measuring-lines was defined as 3D equivalent rock mass block index RBI3D. Moreover, the RBI3D, as an evaluation index, was used to classify the structure of dam foundation. Results showed that the integrity of No.10 bench in the left bank was relatively good. It was found that the ratios of the whole blocky structure, blocky structure and sub-blocky structure were 53.3%, 26.7% and 20.0%, respectively. The analytical results agreed well with the actual situation. Therefore, the presented method has been proven to be scientific rationality and engineering practicability, as the space anisotropy of joint distribution was fully considered and a single quantitative evaluation index was employed to determine the rock mass structure type.

Key words: rock mechanics, dam foundation, network simulation, block index, rock mass structures

CLC Number: 

  • P 642

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