Construction method for detecting and treating karst cave through tunnel advance large pipe shed

Abstract

The invention relates to the technical field of tunnel advance support measure construction, in particular to a construction method for detecting and treating a karst cave through a tunnel advance large pipe shed. The method includes the following steps that (1) pipe shed holes are formed in a tunnel, wherein the pipe shed holes include detection holes and reinforcement holes, and the detection holes and the reinforcement holes are formed in the arch part of the tunnel according to a set arrangement mode; and (2) the detection holes and the reinforcement holes are drilled in the arch part of the tunnel in the tunnel excavation direction, and in the detection hole drilling process, the drilling rate of the drilled holes is recorded and a drilled hole information distribution map is drawn. Compared with the prior art, the method has the advantages that in the method, based on the geological features and technical status of the large no-water filled karst cave in the front of the tunnel,the functional localization of the advance large pipe shed to localize the karst cave firstly and then reinforce the karst cave is clarified, and the pipe shed holes are divided into two types, namely, the detection holes and the reinforcement holes.

Description

technical field [0001] The invention relates to the technical field of construction of tunnel advance support measures, in particular to a construction method for detecting and treating karst caves in advance of tunnel sheds. Background technique [0002] Tunnels in karst-developed strata reveal that large anhydrous filled karst caves are prone to geological disasters such as cave collapse, filling surge, and surface subsidence, causing great losses to life and property. At present, for this kind of geological disaster, the common method of tunnel construction is to use the advanced geological forecast results of the long-distance and short-distance comprehensive geophysical prospecting method as the basis for treatment, and adopt the advanced large-pipe shed measure for advanced treatment. However, in actual engineering applications, the results of advanced geological prediction cannot accurately provide important information such as the type, scale, and spatial location of...

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Problems solved by technology

However, in actual engineering applications, the results of advanced geological prediction cannot accurately provide important information such as the type, scale, and spatial location of the cave, and it is difficult to determine the construction mileage and area of ​​the advanced large-scale pipe shed. Tube sheds, significantly slowing down construction and increasing engineering costs

[0003] Since there is no more reliable method, the current construction unit only conducts advanced large-scale pipe shed construction when the karst cave is exposed on the face of the tunnel and combined with the results of the advanced geological forecast to determine that the karst cave is large and the stability of the filling is poor. Failure to ensure sufficient anti-outburst rock plate thickness often leads to large-scale landslides or filling surge disasters in large anhydrous karst caves exposed or not exposed on the tunnel face during tunnel construction, and the treatment of large anhydrous filled karst caves has little effect

[0004] The existing drilling method to detect advanced geology is to use a drilling rig to drill 4 to 6 holes radially in four directions on the tunnel face, which is suitable for water-rich karst tunnels and is mainly used to detect the occurrence of water in the strata ahead and obtain information It is mainly the water pressure and water volume of the groundwater, and the parameters such as the scale and specific location of the cave in front cannot be obtained. For example, the drilling method disclosed in the patent No. 201710046172.6 and the patent name "Tunnel Karst Water Detection and Treatment Method" is a solution. The existing tunnel karst water is easy to hinder the construction and cause casualties, and it is not suitable for detecting and treating large anhydrous filled caves or caves filled with viscous materials such as silt

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