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Journal of Applied Mathematics
Volume 2013 (2013), Article ID 135467, 9 pages
http://dx.doi.org/10.1155/2013/135467
Research Article

Numerical Simulation and Optimization of Hole Spacing for Cement Grouting in Rocks

China Institute of Water Resources and Hydropower Research, Beijing 100038, China

Received 30 July 2013; Accepted 25 August 2013

Academic Editor: Ga Zhang

Copyright © 2013 Ping Fu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The fine fissures of V-diabase were the main stratigraphic that affected the effectiveness of foundation grout curtain in Dagang Mountain Hydropower Station. Thus, specialized in situ grouting tests were conducted to determine reasonable hole spacing and other parameters. Considering time variation of the rheological parameters of grout, variation of grouting pressure gradient, and evolution law of the fracture opening, numerical simulations were performed on the diffusion process of cement grouting in the fissures of the rock mass. The distribution of permeability after grouting was obtained on the basis of analysis results, and the grouting hole spacing was discussed based on the reliability analysis. A probability of optimization along with a finer optimization precision as 0.1 m could be adopted when compared with the accuracy of 0.5 m that is commonly used. The results could provide a useful reference for choosing reasonable grouting hole spacing in similar projects.