Method for tunneling in hard rock
By utilizing advanced geological prediction boreholes to input media such as cryogenic liquid nitrogen, high-pressure water, and liquid carbon dioxide during hard rock tunnel construction, a multi-field closed-loop coupling system was constructed, solving the problems of high construction cost, low efficiency, and large disturbance to the surrounding rock in hard rock tunnel construction, thus achieving safe and efficient hard rock tunnel excavation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA HYDROELECTRIC ENGINEERING CONSULTING GROUP CHENGDU RESEARCH HYDROELECTRIC INVESTIGATION DESIGN AND INSTITUTE
- Filing Date
- 2026-05-26
- Publication Date
- 2026-07-17
AI Technical Summary
In existing hard rock tunnel construction, pre-splitting rock breaking technology suffers from problems such as high construction cost, low efficiency, large disturbance to the surrounding rock, low energy utilization rate and insufficient intelligence. In particular, the tunneling efficiency of TBMs is significantly reduced in high-strength hard rock strata, and the wear of cutting tools is severe.
Advanced geological prediction boreholes are used as pre-fracture drilling holes. Low-temperature liquid nitrogen, high-pressure water and liquid carbon dioxide are introduced into the rock mass in front of the tunnel face to construct a multi-field closed-loop coupling system. A fracture network is formed by relay fracturing force. Real-time monitoring and data cross-verification are carried out in combination with the drilling measurement system to achieve intelligent differentiated fracturing.
It significantly reduces construction costs, improves tunneling efficiency, reduces tool wear, controls the range of surrounding rock disturbance, enhances energy utilization, and enables safe and efficient hard rock tunnel construction.
Smart Images
Figure CN122407227A_ABST