Research
1. Failure mechanism of tunnel face during shield-driven process (read more...)
In response to the engineering challenge of effective support for the excavation face during underwater shield tunnel construction, research work has been conducted around the mechanism of excavation face instability. The study clarified the microscopic collapse mechanisms of the excavation face in non-cohesive strata and established a quantitative relationship between the ultimate support pressure of the excavation face under high permeability conditions and the stratum loss rate. The research explored the critical burial depth ratio for maintaining stability of the shield tunnel excavation face and proposed a practical method for setting the critical support pressure of the excavation face.
2. The mechanism of synchronous grouting diffusion in shield tunneling (read more...)
In addressing the engineering challenge of effective support during synchronous grouting in shield tunnel construction, research was conducted on the diffusion process and pressure distribution patterns of synchronous grouting. The study revealed the fundamental reason for ineffective support in the upper space of the shield tail gap under four-hole grouting conditions in sandy gravel strata. It clarified the pressure distribution patterns in the shield tail gaps and innovatively explored the impact patterns of asymmetric synchronous grouting on surface settlement. This research further refined the theoretical framework for ground support in shield tunneling with synchronous grouting.
3. Influence on surrounding soils caused by shield-driven process (read more...)
Focused on the development of underground spaces in complex geological conditions and urban core areas, theoretical research and engineering practices were conducted on controlling environmental disturbances during tunnel construction. This advancement has elevated the disturbance control in soft soil areas from 'centimeter-level' to 'millimeter-level.' The study also elucidated the strata disturbance patterns during shield tunnel construction under ultra-shallow overburden conditions, outlining novel techniques for controlling construction-related disturbances.
4. Mechanical Response Patterns of Tunnel Structures under Complex Conditions (read more...)
Our research focuses on the mechanical response of shield tunnel structures under complex geological conditions and intricate loads. We have revealed the influence patterns of construction under different depth-to-diameter ratios on the internal forces of nearby tunnel structures. Additionally, we attemp to clarify the dynamic response modes of submarine shield tunnel structures under strong seismic actions. We have also developed a monitoring method for tunnel lining mechanical response based on wireless transmission technology. These findings provide theoretical foundations and technical support for the safe operation of shield tunnels.
5. The development patterns of lining damage in shield tunnel structures (read more...)
Research on the disaster-causing laws of tunnel structures and surrounding rock materials under complex loads was carried out, starting from the overall perspective of the "rock-structure" system. The analysis of damage to the "rock-structure" system under dynamic loads was extended from the component scale to the material microscopic scale. This further revealed the disaster-causing laws of tunnel structures and improved the design methods of shield tunnel structures under complex loads.
6. Non-destructive testing methods for detecting damage and defects in rock-structure systems (read more...)
Research work has been conducted on the defects and diseases in underground engineering construction and operation. A defect detection method focusing on the "structure-grouting layer" was developed, revealing the mechanism behind the generation of concealed defects and artifacts in structures. This significantly improved imaging accuracy. Additionally, a detection vehicle for hidden defects in tunnels was developed, providing technical support for the construction safety and structural health of tunnels.
(Last updated: 2023/10/22, Beijing)
