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New Austrian Tunneling Method (NATM) was first introduced by NATR method in the early 1960s by the Ravicewicz, Austria.&#8221;,&#8221;subtitle&#8221;:&#8221;&#8221;,&#8221;extra&#8221;:&#8221;&#8221;},{&#8220;component&#8221;:&#8221;repeater_item&#8221;,&#8221;id&#8221;:&#8221;PFUL7&#8243;,&#8221;image_link&#8221;:&#8221;&#8221;,&#8221;title&#8221;:&#8221;The previous tunnel method requires the support material to bear the load generated by the excavation around the excavation surface, which requires a lot of space between the ground and the support.&#8221;,&#8221;subtitle&#8221;:&#8221;&#8221;,&#8221;extra&#8221;:&#8221;&#8221;},{&#8220;component&#8221;:&#8221;repeater_item&#8221;,&#8221;id&#8221;:&#8221;n5Qvr&#8221;,&#8221;image_link&#8221;:&#8221;&#8221;,&#8221;title&#8221;:&#8221;As time goes by, the ground is relaxed, and the heavy load acts on the support, resulting in many ground deformations.&#8221;,&#8221;subtitle&#8221;:&#8221;&#8221;,&#8221;extra&#8221;:&#8221;&#8221;}],&#8221;style&#8221;:&#8221;style_2&#8243;,&#8221;animation&#8221;:&#8221;&#8221;,&#8221;show_images&#8221;:false}]},{&#8220;component&#8221;:&#8221;hc_text_list&#8221;,&#8221;id&#8221;:&#8221;F681L&#8221;,&#8221;css_classes&#8221;:&#8221;&#8221;,&#8221;custom_css_classes&#8221;:&#8221;&#8221;,&#8221;custom_css_styles&#8221;:&#8221;&#8221;,&#8221;rows&#8221;:[{&#8220;component&#8221;:&#8221;repeater_item&#8221;,&#8221;id&#8221;:&#8221;qCn3R&#8221;,&#8221;image_link&#8221;:&#8221;&#8221;,&#8221;title&#8221;:&#8221;The basic principle of NATM is to use rock self-supporting force to fix with Rock Bolt and reinforce with Shotcrete and support material to stabilize the ground and excavate tunnel.&#8221;,&#8221;subtitle&#8221;:&#8221;&#8221;,&#8221;extra&#8221;:&#8221;&#8221;},{&#8220;component&#8221;:&#8221;repeater_item&#8221;,&#8221;id&#8221;:&#8221;l7rIf&#8221;,&#8221;image_link&#8221;:&#8221;&#8221;,&#8221;title&#8221;:&#8221;This method is economical compared to the previous method, has the advantage of suppressing the deformation of the surrounding ground due to the excavation, it is mainly used as the construction method of the downtown tunnel because it can determine the safety by continuous 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