Process for safely constructing release hole outside grouting curtain of tunnel

Abstract

The invention provides a method for safely constructing a release hole outside a grouting curtain of a tunnel. The method comprises the following steps of: 1, designing a release hole according to the detected range of a concentrated water-rich area outside a curtain and the spatial position relationship between the range and a grout-preventing wall; 2, sequentially constructing primary, secondary and tertiary holes in the grouting curtain through the grout-preventing wall, and grouting and sealing primary and secondary casings; inserting release casings into the tertiary casing; mounting a release casing sealing connector with a stop valve on the release casing; 3, connecting a grouting connector which is connected with a double-liquid grouting mixer onto the secondary casing at the end part of the hole, and quantitatively grouting into the gap between the secondary casing and the release casing, stopping grouting when the slurry reaches the boundary of the concentrated water-rich area, closing the double-liquid grouting mixer, and waiting on cement setting; and 4, mounting a water-control valve in an opening state on the release casing at the end part of the hole so that water in the concentrated water-rich area can flow out from the water-control valve along the release casing.

Description

technical field [0001] The invention discloses a safe construction technology for tunnel grouting curtain water leakage drilling. Background technique [0002] In the process of tunnel construction in my country, we often encounter loose and weak strata rich in water, fault fracture zones or karst strata. When the tunnel is excavated to the concentrated water-rich area of ​​this type of stratum and the water-conducting structure is exposed, groundwater will pour into the tunnel, causing major geological disasters such as water inrush and mud inrush, which seriously threaten the safety of the project. At present, curtain grouting is one of the most effective methods to control water inrush and mud inrush disasters in water-rich and weak stratum tunnels. Such as cement single slurry, cement-sodium silicate double slurry, etc.) and make the slurry stones in each hole overlap to form a water-stop curtain, so as to achieve the purpose of anti-seepage and reinforcement of the gro...

AI Technical Summary

Problems solved by technology

If the layout of the drainage holes and the construction process are not proper, the drainage from the drilling holes will wash away and destroy the surrounding rock in the curtain reinforcement circle, which will have an adverse effect on the grouting construction and the formation of the curtain reinforcement circle

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