Tunnel gushing body excavation method

Abstract

The invention provides a tunnel gushing body excavation method, and belongs to the technical field of tunnel gushing body excavation. The method comprises the following steps that 1, sludge in a tunnel is cleared to a certain distance in front of a second lining end, and a front slope surface is piled and compacted by adopting rock blocks; 2, an arch wall is preliminarily supported at the second lining end, and steel bars are implanted into an inverted arch filling surface; 3, a concrete grout stop wall is constructed, and a water drain pipe is pre-buried in the concrete grout stop wall; 4, a grouting pipe is constructed in the concrete grout stop wall, and grouting is carried out in a gushing body through the grouting pipe; 5, the upper part of the concrete grout stop wall is disassembled; 6, a back pressure body is filled between the remaining concrete grout stop wall and a second lining until the back pressure body is flush with the remaining concrete grout stop wall, and stone throwing and sludge squeezing are carried out on sludge in front of the remaining concrete grout stop wall; and 7, the part with the concrete grout stop wall disassembled is excavated section by section, and meanwhile, grouting pipes are additionally arranged on the side wall of the excavated part section by section for grouting reinforcement. According to the method, the gushing body can be safely and effectively excavated, and the phenomenon of water inrush and sludge inrush is avoided.

Description

technical field [0001] The invention relates to the technical field of tunnel inrush body excavation, in particular to a tunnel inrush body excavation method. Background technique [0002] In the process of tunnel construction, it often passes through some areas with complex geological conditions. The surrounding rock is severely deformed, squeezed and wrinkled, the integrity is extremely poor, the rock mass is broken, the slope stability is poor, and the surrounding rock level of the tunnel is low. The risk of water inrush is extremely high. At present, most of the prevention methods for mud and water inrush are pre-reinforcing the surrounding rock of Zhangzi face. Due to limitations, the phenomenon of mud and water inrush occurs from time to time. Once it occurs, the inrush body will fill up to several tens of meters to hundreds of meters behind the face, which will bring great difficulties to the construction. Therefore, how to excavate the inrush body safely and efficie...

AI Technical Summary

Problems solved by technology

[0002] During the construction of the tunnel, some areas with complex geological conditions are often passed through. The surrounding rock is seriously deformed, squeezed and wrinkled, the integrity is extremely poor, the rock mass is broken, the stability of the slope is poor, and the grade of the tunnel surrounding rock is low. The risk of water inrush is extremely high. At present, most of the prevention methods for mud inrush and water inrush are to pre-reinforce the surrounding rock of Zhangzi face. However, due to the complexity of geological conditions, the deviation of geological forecast and the design Limitations: Mud and water inrush occur from time to time. Once it occurs, the inrush body will fill tens of meters to hundreds of meters behind the face, which brings great difficulties to the construction. At present, there is no good solution for the outburst. Therefore, how to excavate the inrush safely and efficiently has become particularly important for dealing with mud and water inrush areas

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