Technology method of reinforced grouting in high-pressure water-rich solution cavity of tunnel

Abstract

The invention relates to the technical fields of tunnel and underground engineering, providing a process method for reinforcing and grouting of a high-pressure water-rich solution cavity of a tunnel. The process method comprises the following steps of: carrying out drilling, grouting and reinforcing within a range required to be reinforced in front of a tunnel work face by adopting an advanced segmented grouting mode; after the grouting is ended, carrying out drilling and flushing on a anchor rod hole at the original grouting hole site by using a geological drilling rig; and feeding a glass fiber anchor rod into the anchor rod hole and carrying out grouting construction. According to the process method disclosed by the invention, the glass fiber anchor rod is additionally arranged in a grouting solidified body to form a space meshy structure body with soil (sand) body, thus the action of the glass fiber anchor rod for resisting shearing, cutting and tensioning in the system is fully exerted. In addition, according to the process method disclosed by the invention, the deformability of digging a hole body is effectively controlled while water from karst can be blocked and the soft ground stratum is reinforced; and the capability of resisting high water pressure can be born and the construction requirement for quick digging and coupling of the karst hole body is met.

Description

technical field [0001] The invention relates to the technical field of tunnels and underground engineering, and mainly relates to a high-pressure water-rich dissolved cavity reinforced grouting process for tunnels. Background technique [0002] During tunnel excavation in karst areas, high-pressure water-rich filling karst is often encountered. Due to the complex development characteristics of karst, the filling medium is mostly clay, sand and other fine media with loose structure and poor self-stabilization ability. Due to the special nature of karst geology, in the process of high-pressure water-rich karst treatment, high-level discharge branch tunnels are mostly used to implement water release and pressure reduction to avoid the construction risk of high-pressure water-rich karst, but not all karsts can achieve potential energy pressure reduction. If the full-section curtain grouting technology is used to reinforce and improve the soil (sand) body in the high-pressure wat...

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Problems solved by technology

However, due to the small fineness of the medium, the grout is used to reinforce the solution cavity filling by means of splitting, filling and compacting. Although it can achieve the effect of sealing karst outflow and strengthening and improving the formation, the medium itself has poor cementation ability, and the tunnel is During the excavation of the dissolved cavity, the anti-deformation ability of the grouting reinforced body is poor, and it is easy to cause stratum instability due to excessive deformation, causing sudden mud gushing

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