Fore support and excavating method of inclined tunnel

Abstract

The invention discloses a fore support and an excavating method of an inclined tunnel. The excavating method includes: punching grouting holes in a tunnel face of a pilot tunnel of the inclined tunnel, which is to be excavated, according to a set grouting hole interval for the inclined tunnel to be excavated; forming the fore support of the tunnel face after grout liquid is injected into the grouting holes; excavating the pilot tunnel with set stride length from the tunnel face according to the height and the span of the pilot tunnel, which are designed, wherein the grouting hole interval is predetermined according to the height and the span of the pilot tunnel. The technical scheme includes that cohesion and internal friction angles of surrounding rock of the tunnel face of the inclined tunnel to be excavated, and the designed height and the designed span of the pilot tunnel of the inclined tunnel to be excavated can enable the stability coefficient of the tunnel face of the pilot tunnel to be excavated to exceed a stability threshold value, and accordingly stability of the tunnel face is guaranteed, and safety can be improved during the pilot tunnel excavating process.

Description

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AI Technical Summary

Benefits of technology

This technology helps improve the accuracy and security of drilling operations by determining the distance between holes for setting up cement slurry or other materials used when constructing tunnels through guided methods like pilings. By measuring these distances beforehand with reference points on the surface being dug, it becomes easier than ever to determine how well they are going after each step. Additionally, this method improves the quality control over the construction process while also reducing costs associated therewith.

Problems solved by technology

This technical problem addressed in this patented text relates to improving the stabilization of a pilot channel used in drilling operations while preventing damage caused by slippage due to its own movement over time. Existing methods involve adding extra supports like guards and wedges to increase stability but they cannot effectively reduce friction forces generated throughout their lifetimes without causing instability issues.

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