Concrete linings are considered not to be subjected to any load, since shotcrete and rock bolts are generally used as support members for mountain tunnels. Since stringent construction conditions and environmental conditions have been imposed on mountain tunneling methods in recent years, however, in some cases the concrete lining is also made to hold a part of the load and provide support for the tunnel. In such cases the concrete lining becomes an important aspect as part of the support structure of the tunnel.
展开▼
