From the theoretical analyses of data in several practical projects of gypsum stacks

a new disposal scheme for drainage and anti-permeance system of tailings dam is proposed. By setting a drainage layer under the gypsum stack

it differs from traditional drainage plans so that it can improve the drainage efficiency at the bottom of the stack and depress saturation line level. The new scheme not only improves the security of the gypsum stack

but also reduces its running cost. Furthermore

it has been put into practice in several tailings dam projects and has achieved outstanding effect. It not only provides an efficient theoretical foundation for the design of gypsum stack

but also gives important guidance for the anti-permeance design of other kinds of industrial residue deposit.