sand filled drainage layer 排水砂垫层
leachate drainage layer 渗滤污水排水层
radial drainage layer 横向排水层
pervious drainage layer 多孔排水层
internal drainage layer 内部排水层
crushed stone drainage layer 碎石排水层
drainage protected layer 排水保护层
As landfill site working, biochemical process and seepage of leachate always affect and change drainage layer permeability.
垃圾填埋场运行过程中，渗滤液的渗流和生物化学作用，不断影响和改变着排水层的渗透性能。
By dewatering of foundation pit, the points above the drainage layer all have a considerable influence and the shorter distance with the subgrade surface the more influence.
但随着基坑降水的进行，排水层以上各点均受较大影响，并且距离路基表面越近影响越大。
Closure cover system is one of important parts of landfill site construction, it includes landfill gas discharge guiding layer, geotechnical film, drainage layer and plant cover surface soil layer.
封场覆盖系统是垃圾卫生填埋场建设的重要组成部分，覆盖系统包括气体导排层、土工膜、排水层、植被表土层。
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