Double-shell coupling supporting method of deep soft rock tunnel

• Main Authors: ZHANG LIANYING, WU RUI, LI MING, LI CHONG, XU JINHAI, ZHOU BAOJING, LU AIHONG, WAN SHIWEN, LI KAI
• Format: Patent
• Language: Chinese; English
• Published: 03.08.2011
• Subjects: EARTH DRILLING; FIXED CONSTRUCTIONS; GALLERIES; LARGE UNDERGROUND CHAMBERS; MINING; SHAFTS; TUNNELS

The invention relates to a double-shell coupling supporting method of a deep soft rock tunnel, which comprises the following steps: carrying out overall-length anchoring and reinforcement on surrounding rocks of the tunnel by adopting a prestressed short anchor rod to ensure that the surrounding rocks at shallow parts of the tunnel form a rock shell with the thickness being not less than 1m, and fully transforming high-stress energy and expanded deformation energy at deep parts by utilizing enough space of a reversed deformation layer; and furthest exerting the bearing capacity of a plastic zone. In the deformation process of the tunnel, prestressed anchor cable supports are installed at zones firstly generating discontinuous deformation or destroy, and the optimal time of the anchor cable supports is judged by monitoring and analyzing surface displacement of the tunnel. A stress centralizing zone is transferred to the deep parts of the surrounding rocks through the action of the anchor cable supports, thereb