A Construction Method of Reversing Tunnel Collapse

Abstract

The invention relates to a construction method for treating tunnel landslides by an upside-down method, which comprises the following specific steps: 1. erecting a safety shed protection steel structure in the cavern; 2. pouring concrete on the safety shed protection steel structure in the cavern; Consolidation grouting for the side wall foundation of the concrete structure, 4. Anchoring the upper steel structure concrete structure, 5. Clearing the slag in the cave and underpinning the support system of the steel structure concrete structure, 6. Concrete lining of the cavity in the collapsed section, 7. Backfill grouting for the lining concrete top arch of the collapsed section. The beneficial effects of the present invention are: adopting the steel structure concrete upside-down method, avoiding the occurrence of personal and mechanical safety accidents caused by local slumping due to the instability of the collapsed arch during the landslide treatment process; using anchor cables or anchor piles to lock The arch ring formed by steel structure concrete or consolidation grouting simplifies the process, avoids the mutual interference of slag discharge, pouring concrete cantilever and advance of landslide treatment, and shortens the time limit for landslide treatment.

Description

technical field [0001] The invention belongs to the technical field of hydraulic construction in water conservancy and hydropower projects, and in particular relates to a construction method for dealing with tunnel collapses by an upside-down method. Background technique [0002] Tunnel collapse is a phenomenon that a large number of rocks and weak structural belts on the roof and side walls of the tunnel collapse due to the action of stress. The main reason for the collapse is that when the tunnel is excavated, the soft rock mass of the surrounding rock of the tunnel produces crack damage under the action of stress release, and the joints and bedding in the surrounding rock are loose and peeled off. Affected by complex and changeable geological conditions, such as groundwater, karst, fault fracture zone, high ground stress, rockburst, gas, partial pressure shallow burial, expansive soil and other conditions, especially the strength of rock with a large softening coefficient...

AI Technical Summary

Problems solved by technology

[0009] The defects in the prior art are: the preconditions of the above-mentioned (1)~(3) landslide treatment techniques are not suitable for the condition that the soft rock mass of the tunnel surrounding rock produces crack damage under the effect of stress release; Falling arch reinforcement method, because the collapsed arch is a stacked masonry structure with a layer thickness of only 20cm, the safety risk of support treatment is high, and the stacked structure may collapse due to mechanical disturbance at any time, which poses a safety threat to the construction personnel and mechanical equipment