Excavation compensation method for tunnelling in deep rock engineering

An excavation compensation method for tunnelling in deep rock engineering, wherein, comprising:

• acquiring an engineering geological information of the tunnelling in deep rock engineering;
• determining an engineering hazard type based on the engineering geological information;
• determining an excavation compensation support strategy for a surrounding rock of the tunnelling in deep rock engineering based on the engineering hazard type, wherein the excavation compensation support strategy is configured to reduce a difference value between a radial stress of the surrounding rock of the tunnelling in deep rock engineering and an original surrounding rock stress to within a preset approximate value range, and is configured to prevent a stress concentration occurred in a tangential stress;
• and
• performing a supplementary support control on the surrounding rock of the tunnelling in deep rock engineering based on the excavation compensation support strategy;
• wherein the engineering geological information comprises a geological structure information, a hydrogeological information, a surrounding rock lithological information, a physical and mechanical property information, and/or a surrounding rock integrity;
• wherein the engineering hazard type comprises a super meter level soft rock large deformation hazard type, a tunnelling rock burst hazard type, and an active fault type and/or a fault fracture zone type;
• wherein, determining the engineering hazard type based on the engineering geological information comprises:
• when determining a high crustal stress hard rock stratum information based on the engineering geological information, the engineering hazard type is determined as a tunnelling rock burst hazard type based on the high crustal stress hard rock stratum information;
• wherein, determining the excavation compensation support strategy for the surrounding rock of the tunnelling in deep rock engineering based on the engineering hazard type comprises:
• when the engineering hazard type is characterized as the tunnelling rock burst hazard type, the excavation compensation support strategy is determined as the high pre-stressing and strong-toughness anchor net combination strategy, and an energy gathering directional blasting strategy;
• wherein, the energy gathering directional blasting strategy comprises:
• during a construction of the tunnelling in deep rock engineering, a plurality of energy gathering directional tubes are embedded in a rock mass within a preset excavation range, and explosives in the energy gathering directional tubes are detonated to generate a high-temperature and high-pressure gas;
• and
• a row of linearly distributed directional energy gathering holes respectively defined in at least one set direction of each energy gathering directional tube are configured to form the high-temperature and high-pressure gas into a high-energy flow, which is outwardly concentrated on a corresponding hole wall to generate a tensile stress, and the surrounding rock of the hole wall is tensioned and cracked along the set direction under the tensile stress;
• and
• the rock mass within the preset excavation range is directionally tensioned and fractured through a superimposing stress field generated by each row of the directional energy gathering holes, and a directional blasting cutting surface is formed.