What is NATM? What is difference between RMR and Q-value? what is the procedure for portal stability? What are different type of rock bolts?

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Accepted Answer

NATM is a tunneling method that uses the surrounding rock mass to support the tunnel. RMR and Q-value are rock mass classification systems. Portal stability is the stability of the entrance to a tunnel. Rock bolts are used to reinforce the rock mass.

NATM stands for New Austrian Tunneling Method and is a tunneling method that relies on the strength of the surrounding rock mass to support the tunnel.
RMR (Rock Mass Rating) and Q-value are both rock mass classification systems used to assess the quality of the rock mass and its ability to support a tunnel.
Portal stability refers to the stability of the entrance to a tunnel and is important for ensuring the safety of workers and equipment.
Rock bolts are used to reinforce the rock mass and come in various types, including mechanical, grouted, and frictional bolts.
The procedure for portal stability involves assessing the quality of the rock mass, determining the appropriate support system, and installing the necessary reinforcement.
Examples of rock bolt types include expansion shell bolts, split set bolts, and resin bolts.

What is NATM? What is difference between RMR and Q-value? what is the procedure for portal stability? What are different type of rock bolts?

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