Abstract
The seepage through dam foundations and abatments reduces the capacity of storage and, furthermore, might cause the failure of dam. It costs very much to reduce seepage by grouting and other water tight procedures.
Lugeon test method is common practice for measuring rock mass permeability in the field of dam construction. However, there was no standard test procedures nor interpretation methods. Therefore, the Ministry of Construction defined tentatively the Manual of Lugeon Test in 1977. Some test procedures are as follows; (a) the borehole diameter should be 66 mm, (b) test section length should be 5m, (c) the maximum pressure at the test section should be over 10kg/cm2 unless ground breaks.
