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

林地土壤因子调查的结果是混交林内土壤的通气性、透水性及总孔隙度均好于纯林。

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.

分析了基坑降水引起坑周边地面沉降的机理、影响范围，探讨了基坑降水引起地面沉降的影响因素及减少地面沉降的措施。

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.

透水水泥路面混凝土具有良好的透水性，能够缓解公路积水和城市环境问题，是一种环保型的混凝土。