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一、病害原因及概况目前我国修建的铁路隧道,按铁路工程技术规范和部颁标准图中的规定,除围岩压力很大或有可能出现底压力的情况,隧道底部和设仰拱外,其余均以10cm厚110号混凝土铺底。由于隧道通过地层的地质条件不同,在软质围岩地段铺底强度不够,且隧道施工时铺底均在主体工程基本完成之后进行,往往受不到应有的重视。在铺底混凝土与围岩间夹有松散弃碴层的情况是屡见不鲜的。
First, the cause of the disease and overview At present, China’s construction of railway tunnels, railway engineering specifications and ministerial standards according to the provisions of the chart, in addition to the surrounding rock pressure is great or there may be the end of pressure conditions, the bottom of the tunnel and set aside the arch, The rest are 10cm thick 110 concrete laying. Due to the different geological conditions of the tunnel through the strata, the strength of the bottom of the soft surrounding rock is not enough, and the bottom of the tunnel is basically finished after the main works are completed, often fail to receive due attention. It is not uncommon to find loose ballast beds between the concrete floor and the surrounding rock.