Taking the Tabaiyi tunnel in Yunnan Province as the research background, the tunnel has suffered from disasters such as large deformation of initial support, deformation of steel arches, and mud and water inrush under the original support conditions. According to the theory of excavation compensation and the requirements of traffic tunnel engineering on the anchorage system, this paper proposes a high prestressing anchorage system applicable to large deformation tunnels traversing fault fracture zones and capable of realizing the concept of timely support, and the application of the supporting technology is carried out in the experimental study. Based on the resin anchorage that can be prestressed after the rapid condensation of the overrun double-gradient grouting reinforcement, the rapid prestressing NPR anchorage system of "overrun grouting+resin anchorage" and its supporting active support technology system are proposed. The results of the field experiment show that: under the implementation of double gradient grouting and NPR anchor cable timely active support system, the effect of large deformation control is remarkable, and the large deformation of surrounding rock is effectively controlled within 300mm, which verifies the superiority of the deformation control technology based on rapid prestressing anchorage support in large deformation tunnels through the fault fracture zone.
With the quick development of underground engineering in recent years, the construction of railway, highway, and water conservancy tunnels in China has also developed rapidly. Among them, there is no lack of some tunnels through fault fracture zones, which are prone to risky disasters such as large peripheral rock deformation, water and mud inruch during the construction process (Jiang (2023) and Chen (2023)). Taking the Jian-ge-yuan Expressway tunnel as a typical example, the Tabaiyi tunnel is one of the high-risk tunnels along the whole route. The length of the tunnel is 2.6 kilometers. The cross-section area is close to 140 m2. The construction took five years, and some sections of the tunnel still showed deformation, cracking, falling block misalignment, arch rise, and other phenomena after the second lining was poured. Therefore, the construction of the Tabaiyi highway tunnel is one of the most difficult problems in the world of tunneling.
