下衬 meaning in English

lower gasket

Study on the safety velocity for concrete lining under p wave loading
波作用下衬砌混凝土的爆破安全振动速度研究
3d numerical simulation of the lining structure under high water pressure in mountain tunnel
山岭隧道高水压下衬砌结构三维数值模拟
The change regularities of lining pressure and the failure process of surrounding rocks in permeation which a special sand is used as model materials are successfully simulated . the basic theory is established for the study of same type and the scientific basis for the tunnel prop design in saturation rock is provided
采用特定的河砂作为模型材料成功地模拟了破碎围岩隧道在遇水情况下衬砌的受力变化规律及岩体的破坏过程，为开展同类型研究奠定了基础理论，为饱水岩体隧道开挖支护设计提供了依据。