Treatment construction method for continuous collapse and roof fall in small-section steep slope tunnel

Abstract

The invention discloses a treatment construction method for continuous collapse and roof fall in a small-section steep slope tunnel. The treatment construction method comprises the following steps that A, a plurality of rows of supporting arch frames are arranged; B, loose dangerous rocks after blasting load disturbance are blocked through a single beam structure supporting system and an integralarch structure supporting system formed by arranging barrier layers, supporting layers and protection layer pipe sheds, the downward sliding impact force is weakened, and a plurality of layers of buffer protection layers are formed; C, the limitation on a limited space of the small-section steep slope tunnel is overcome through a self-feeding drill pipe capable of being lengthened through assemblyand a conical drill bit with a spiral rotary steel ring, and the rotary drilling force and the rock crushing and breaking effect of the drill pipe are improved; and D, isolation waterproof layers arearranged at the tops of the supporting arch frames to weaken the soaking and softening effects of underground water, and the electric safety of construction in the tunnel is guaranteed. The treatmentconstruction method has the effects of high efficiency, quickness, safety and reliability for the treatment of continuous collapse and roof fall geological disasters in the small-section steep slopetunnel, the normal proceeding of tunnel blasting excavation is guaranteed, and the construction period is accelerated.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a construction method for controlling continuous landslides and roof caving of small-section steep slope tunnels. Background technique [0002] At present, in tunnels and underground projects at home and abroad, the "drilling and blasting" method is still used as the main method of tunnel excavation, that is, tunnel rock-breaking excavation is completed through technological processes such as blasthole drilling, powder charging, blasting, and slag removal. However, due to the complex and changeable geological structure of underground rock formations, during the blasting excavation process, tunnel collapse accidents often occur due to the existence of fault fracture zones, loose soft soil, and water inrush and other unfavorable geology. In order to ensure the successful completion of tunnels and underground projects, it is necessary to effectively control such geological hazards...

AI Technical Summary

Problems solved by technology

However, for some tunnels, due to the looseness of the broken rock mass and the lubrication of groundwater, continuous landslides occur, that is, the landslide accident will last for days or even weeks after the accident, and the height of the landslide area is relatively high, so it is impossible to wait for it to form like the above situation. After a relatively stable collapse cavity, strengthen the support of the collapse cavity

If this kind of continuous landslide cannot be dealt with in time and effectively, it will directly lead to the further expansion of the landslide area, and even lead to the surface collapse and the occurrence of integral landslide and roof fall accidents.

In addition, because general roads, railways and other traffic tunnels often have a slope of 0.3% to 3.5% when meeting traffic and drainage requirements; while small-section tunnels in mines are often used in mining belt conveyor corridors, there are often up to 21% slopes in their design. The above steep slopes lead to many limitations in the implementation of conventional traffic tunnel landslide control schemes

At the same time, due to the limitation of the setting and curing time of conventional grouting filling and plugging cementitious materials, it is difficult to meet the timely, rapid and effective principles of continuous landslide treatment, and it is difficult to ensure the normal progress of tunnel blasting and excavation

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