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References

Tunnel Rock Bolts Using Case: Mt Erlang Tunnel of the Sichuan-Tibet Highway
Tunnel Rock Bolts Using Case: Mt Erlang Tunnel of the Sichuan-Tibet Highway
Mt Erlang Tunnel was excavated by the new Austrian Tunneling method (NATM / SEM).
      
The designed maximum horizontal stress was 50MPa and the measured value was 32.7MPa.
   
It is located in National Road No.318 line. Mt Erlang Tunnel, at 2,948 meters (9,672 feet) was the longest, deepest buried, highest geostress tunnel at that time.

       
Shotcrete- bolt support is the main method in the construction of Mt Erlang Tunnel. It requires a lot of high-quality rock bolts to shore up the rock and soil. As the essential component of NATM, the anchor bolts are chosen depending on the rock quality designation and the type of excavation.
        
Mt Erlang Tunnel is one of the typically projects ONTON participated. The rock anchor bolts are timely supplied and its good performance ensured the smooth implementation of the tunneling.
        
This tunnel construction won the Tien-yow Jeme Civil Engineering Prize, which is the biggest prize in Chinese Civil Engineering.
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