管道排泄系统的存在使边坡具有良好的渗透性，能有效减小坡体中的渗透力和潜在滑面的孔隙水压力；
When GPDS developed in DCS, the permeability of soil mass would become dramatically larger, and the seepage force of groundwater and pore water pressure on sliding surface would reduce;
若土体中粘粒含量高，则形成管道排泄系统所需的时间长，土体的渗透性也相对较低，反之则所需的时间短且渗透性高；
The higher the clay particle content in DCS was, the longer the time needed for the development of GPDS was, and the worse the permeability of soil mass was;
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