%0 Journal Article %T Numerical method for estimating void spaces of rock joints and the evolution of void spaces under different contact states %A Xia,, Caichu %A Gui,, Yang %A Wang,, Wei %A Du,, Shigui %J Journal of Geophysics and Engineering %V 11 %N 6 %@ 1742-2132 %D 2014-12-01 %I Oxford Academic %~ DeepDyve