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衬砌指的是为防止围岩变形或坍塌
衬砌指的是为防止围岩变形或坍塌，沿隧道洞身周边用水泥混凝土等材料修建的永久性支护结构。
Lining refers to the permanent support structure constructed with cement concrete and other materials around the tunnel body to prevent deformation or collapse of surrounding rock.
衬砌技术通常是应用于隧道工程、水利渠道中。
Lining technology is usually used in tunnel engineering and water conservancy channel.
衬砌简单说来就是内衬，常见的就是用砌块衬砌，可以是预应力高压灌浆素混凝土衬砌。
The lining is simply called lining, and the common lining is block lining, which can be prestressed high-pressure grouting plain concrete lining.
二次衬砌就是指一次衬砌不能达到使用要求时，就在一次衬砌内侧再再一次衬砌。通俗的比喻，像是衣服的里衬一样，比如磨损严重的地方里衬就要加厚些。
The secondary lining means that when the primary lining can not meet the service requirements, it will be lined again inside the primary lining. Popular metaphor, like the lining of clothes, for example, the lining should be thickened in places with serious wear and tear.
Lining refers to the permanent support structure constructed with cement concrete and other materials around the tunnel body to prevent deformation or collapse of surrounding rock.
衬砌技术通常是应用于隧道工程、水利渠道中。
Lining technology is usually used in tunnel engineering and water conservancy channel.
衬砌简单说来就是内衬，常见的就是用砌块衬砌，可以是预应力高压灌浆素混凝土衬砌。
The lining is simply called lining, and the common lining is block lining, which can be prestressed high-pressure grouting plain concrete lining.
二次衬砌就是指一次衬砌不能达到使用要求时，就在一次衬砌内侧再再一次衬砌。通俗的比喻，像是衣服的里衬一样，比如磨损严重的地方里衬就要加厚些。
The secondary lining means that when the primary lining can not meet the service requirements, it will be lined again inside the primary lining. Popular metaphor, like the lining of clothes, for example, the lining should be thickened in places with serious wear and tear.
