U形衬砌渠道
the lining of U Canal
U-shape canal with concrete lining
衬砌选型
selected type of lining structure
衬砌外水压力
external water pressure on lining
衬砌损坏原因
reason of damage of channel’s brickwork
衬砌渠道
channel with concrete lining
canal with concrete lining
衬砌破坏因素
damaging factors for lining