(1) Pervious cement pavement concrete is of good perviousness, it can release the problems of highway seeper and urban environment, so it is a sort of environmental protection concrete.

(2) Investigation of the soil factors showed that the aeration and water perviousness of mixed forest were better than that of pure forest.

(3) According to the problems of WZ-C bell-less top charging equipment such as high temperature and perviousness of distributor. The causes are analyzed. The water cooling and block system are modified.

(4) The maximum depth of the pit is mainly related to the inflow angle, unit discharge and the perviousness of the dike etc. with the maximum impact from the Unit discharge.

(5) The article analyses the mechanism and affected range of surface settlement around by excavation perviousness, and discusses the affecting factors and the measures to control it.