With the field survey of rock mass structural faces as the basis, the discrete mediator permeation model is set up, a calculation of the REV(Representative Element Volume) equivalent permeation tensor is conducted, and the boundary element method is used to simulate and investigate the underground drainage effectiveness of different permeation tensor conditio.

The application of high-density polythene double-wall corrug ated pipes in drainage projects;

It also approaches the possibility of glass steel pipes with sand in the drainage project of Pudong International Airport.

So subgrade drainage project,especially concealed drainage works,need to be detected to guarantee the quality,give full play to its project results,and timely find problems at running highway.