Method of adjacent buildings protection and tunnel foundation pit excavation in urban large section open excavation tunnel

Abstract

The invention provides a method of adjacent buildings protection and tunnel foundation pit excavation in urban large section open excavation tunnel, which includes the following steps: 1) before the excavation of the tunnel foundation pit, a first isolation structure of a first predetermined length is arranged along the excavation direction of adjacent buildings in a soil layer between adjacent buildings and a preset position of the enclosure structure of foundation pit; 2) a second isolation structure of a second predetermined length is arranged at both sides of the preset position of the enclosure structure of foundation pit; 3) the enclosure structure of foundation pit is applied to the preset position of the enclosure structure of foundation pit; 4) a tunnel foundation pit is excavatedin section. The method of adjacent buildings protection and tunnel foundation pit excavation in urban large section open excavation tunnel has the advantages of safe and efficient construction, easyoperation, and easy application.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a method for protecting buildings adjacent to urban large-section open-cut tunnels and excavating tunnel foundation pits. Background technique [0002] In the construction of large-section open-cut tunnels adjacent to buildings in the city, the tall buildings adjacent to the tunnel foundation pit will generate large unbalanced stresses on the surrounding strata and foundation pits, and it is easy to cause unbalanced damage to the buildings adjacent to the foundation pit during the tunnel excavation process. Uniform settlement and inclination affect the function and safety of the building, and there are certain potential safety hazards; the traditional construction method is slow in progress, low in efficiency, poor in the circular connection of the excavation surface, and has large mutual interference, and the construction quality cannot be fully guaranteed. Therefore,...

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Problems solved by technology

[0002] In the construction of large-section open-cut tunnels adjacent to buildings in the city, the tall buildings adjacent to the tunnel foundation pit will generate large unbalanced stresses on the surrounding strata and foundation pits, and it is easy to cause unbalanced damage to the buildings adjacent to the foundation pit during the tunnel excavation process. Uniform settlement and inclination affect the function and safety of the building, and there are certain potential safety hazards; the traditional construction method is slow in progress, low in efficiency, poor in the circular connection of the excavation surface, and has large mutual interference, and the construction quality cannot be fully guaranteed. Therefore, Need to choose a construction method that can adapt to geological changes and transition quickly

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