GROUNDWATER ANALYSIS OF UNDERGROUND CAVERN BY MEANS OF ROCK BLOCK MODEL

With respect to the groundwater analysis involving tunnels and caverns in rock, most papers have presented the problems on the basis of the assumption that the porous media were undeformable. Because of the dynamic deformation between fissures and rock masses due to water pressure, the groundwater motion will be affected by the deformable medium in addition to the excavation of underground structures.This paper aims at an examination of hydraulic behavior and the analysis of groundwater flow by a rock block model which behaves as an elastic body affected by the dynamic change of fissure water pressure. A new equation, which takes the vertical distribution of permeability into consideration is proposed based on both theory and field investigations. By this equation, the groundwater movement around the cavern is analyzed by the rock block model in a confined stratum of fractured rock. Results obtained from the finite difference method are examined by some laboratory experiments, which were carried out by using a rock block model composed of a number of cubic blocks and a cavern. Comparing their numerical and experimental results, it is found that the seepage flow analysis of the underground cavern by means of the rock block model may be valid for not only the analysis of flow around the cavern but also the hydraulic modelling of seepage motion in rock masses.rights: 社団法人地盤工学会rights: 本文データは学協会の許諾に基づきCiNiiから複製したものであるrelation: IsVersionOf: http://ci.nii.ac.jp/naid/110003914840