Tunnel excavation construction method of completely weathered granite shallow-buried water-rich layer milling excavator

Abstract

The invention provides a tunnel excavation construction method of a completely weathered granite shallow-buried water-rich layer milling excavator. The tunnel excavation construction method of the completely weathered granite shallow-buried water-rich layer milling excavator comprises the steps that guide pipes are adopted for pre-supporting, the guide pipes are directly pushed into guide holes through a pneumatic rock drill, and grouting is carried out on the guide pipes; a drainage device is driven on the face of a tunnel in the tunnel advancing direction, wherein the drainage device is arranged below the right portion of the face; part of waterflow is drained through well-points dewatering, the face water seepage phenomenon is weakened, the face is excavated through the milling excavator, sealing is carried out through face net hanging and concrete spraying in the construction process, and slumping and collapsing caused by face surrounding rock front face extrusion are effectively controlled through additional arrangement of the drainage device and other measures. The tunnel excavation construction method of the completely weathered granite shallow-buried water-rich layer milling excavator has the advantages of improving the drainage efficiency, improving the construction progress and the guaranteeing the stability of the tunnel face.

Description

technical field

[0001] The invention relates to the technical field of tunnel excavation, in particular to a tunnel excavation construction method for a fully weathered granite shallow buried water-rich layer milling machine. Background technique

[0002] The fully weathered granite water-rich layer has the characteristics of large settlement deformation, high soil water content, and poor self-stabilization ability. Due to the influence of groundwater, the geological conditions are complex, the excavation is prone to collapse, the safety risk is high, and the construction is difficult.

[0003] In the process of excavating tunnels in the granite water-rich layer, a large amount of accumulated water will seep out of the tunnel face. In the existing technology, drainage pipes are used to directly drain the tunnel while digging, resulting in large over-excavation and large disturbance to the tunnel face. In addition, the water on the face of the tunnel is diverted to both sides...

Examples

Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] Please refer to figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 and Figure 6 in, figure 1 Schematic diagram of the construction method for excavating the excavation tunnel of the fully weathered granite shallow buried water-rich layer milling machine provided by the present invention; figure 2 for figure 1 The tunnel section shown; image 3 for figure 1 The top view of the sponge pad structure shown; Figure 4 for figure 1 The enlarged schematic diagram of the structure at A shown; Figure 5 for Figure 4 The schematic diagram of the internal structure of the cylinder is shown; Figure 6 for figure 1 The schematic diagram of the structure of the drainage mechanism is shown. The tunnel excavation method of fully weathered granite shallow buried water-rich layer milling excavator includes:

[0028] S1: Use conduit 3 for pr...

technical field

[0001] The invention relates to the technical field of tunnel excavation, in particular to a tunnel excavation construction method for a fully weathered granite shallow buried water-rich layer milling machine. Background technique

[0002] The fully weathered granite water-rich layer has the characteristics of large settlement deformation, high soil water content, and poor self-stabilization ability. Due to the influence of groundwater, the geological conditions are complex, the excavation is prone to collapse, the safety risk is high, and the construction is difficult.

[0003] In the process of excavating tunnels in the granite water-rich layer, a large amount of accumulated water will seep out of the tunnel face. In the existing technology, drainage pipes are used to directly drain the tunnel while digging, resulting in large over-excavation and large disturbance to the tunnel face. In addition, the water on the face of the tunnel is diverted to both sides...

Examples

Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] Please refer to figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 and Figure 6 in, figure 1 Schematic diagram of the construction method for excavating the excavation tunnel of the fully weathered granite shallow buried water-rich layer milling machine provided by the present invention; figure 2 for figure 1 The tunnel section shown; image 3 for figure 1 The top view of the sponge pad structure shown; Figure 4 for figure 1 The enlarged schematic diagram of the structure at A shown; Figure 5 for Figure 4 The schematic diagram of the internal structure of the cylinder is shown; Figure 6 for figure 1 The schematic diagram of the structure of the drainage mechanism is shown. The tunnel excavation method of fully weathered granite shallow buried water-rich layer milling excavator includes:

[0028] S1: Use conduit 3 for pr...

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