Abstract:Zhongshan Guzhen Express Line (Shagu Highway) Rapid Transformation Project Set up an open-cut tunnel at the node of Yuxiang Road. The tunnel site is located in a deep soft soil area. There is a 500kV high-voltage line corridor above the tunnel plane projection with a small-angle, The vertical construction space is limited. This paper takes this project as an example to study the common problem that It is difficult to pass the stability calculation of pit bottom uplift in soft soil layers, and draws on the research results of others to give a solution; at the same time, taking this project as an example, taking the project as an example, it is proposed that the bottom reinforcement construction under the condition of limited clearance can be realized by using the connecting rod mixing pile. This technology can not only meet the deep reinforcement needs of mixing piles, but also has a lower price than the conventional high-pressure jet grouting pile reinforcement technology commonly used under low headroom. At present, the construction drawing design documents based on the above solutions have been approved, which will provide a useful reference for the design of open-cut tunnels in soft soil areas with low construction headroom conditions.
