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Issue:ISSN 1006-5539
          CN 51-1183/TE

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    Your Position ：Home->Past Journals Catalog->2012 Vol.5

    Application of NAT M Tunnel Method in Gas Pipeline Crossing Tunnel and its Optimization
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    Author's Workplace：
    Key Words： NAT M tunnel method； Tunnel； Gas pipeline； Experiment； Process optimization； Drilling； Angle
    Abstract：The rock of Jiajia Ridge Tunnel is of hard texture， if New Austrian Tunneling Method （NAT M） is applied， its construction is very difficult and require a lot of labor and cost. In order to speed up construction progress， many trials are conducted and construction techniques are optimized. Selected is wedge cut and optimized are materials and types of drill rod and boring bit and priming system. Meanwhile， such measures are taken as drill hole sealing， adjustment of drill hole layout and angles， control of drilling cut hole angle to 40°  ～50°and expansion of free face of tunnel face. Work efficiency is improved obviously， the construction progress is accelerated and construction costs are reduced greatly after construction techniques are optimized.

     

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