Zonal bolt-grouting support device and method for cataclastic rock mass large deformation of high-stress tunnel

A zonal bolt-grouting support device for cataclastic rock mass large deformation of a high-stress tunnel, comprising:

• a high-strength prestressed anchor bolt (1);
• an expansion anchoring agent (2);
• a decoupling element (3);
• a grouting steel pipe;
• and
• a reverse anti-skid device (7);
• wherein the expansion anchoring agent (2) is placed in a head, a middle, and a tail of the anchor bolt (1) respectively;
• the decoupling element (3) is continuously wound in the middle of the anchor bolt (1) and passes through the expansion anchoring agent (2) at the middle of the anchor bolt (1), to prevent the anchor bolt from being broken when a surrounding rock has a large deformation;
• the grouting steel pipe is arranged side by side with the anchor bolt (1) in a drill hole;
• the grouting steel pipe comprises a shallow grouting steel pipe (4) and a deep grouting steel pipe (5), both of which insert the expansion anchoring agent (2);
• a grouting stop valve is installed at an end of the grouting steel pipe, and 3 to 5 grouting holes (6) are drilled in a middle and a tail of the grouting steel pipe;
• and
• the reverse anti-skid device (7) is arranged at the tail of the anchor bolt (1).