Tunnel excavation detecting method in high ground temperature state

Abstract

The invention discloses a tunnel excavation detecting method in a high ground temperature state, and solves the problem of lacking of a determined detection method in the aspect of ground temperaturediscrimination and detection in the prior art. The detecting method comprises the steps of measuring rock temperature in a tunnel, environment in the tunnel, surrounding rock ground temperature, environment outside the tunnel and/or water temperature in the tunnel. The specific method for measuring the rock temperature in the tunnel comprises the steps of: drilling a hole by means of a pneumatic drill in a side wall 50 m away from an excavation face and in the surrounding rock which is 1.0-1.2 m high away from the tunnel bottom plate, blowing the hole with high-pressure air, and drilling a hole upwards and obliquely at 5-10 degrees, wherein the drilling depth is larger than or equal to 3 m, the hole diameter is larger than or equal to 42 mm; and sealing the hole opening after drilling, placing a probe of a temperature measuring instrument into the bottom of the hole after the drilled hole is balanced for 1.5-2.5 h, carrying out reading after an output value of the thermometer is stable, and acquiring a final temperature reading of the temperature measuring probe, namely, the protolith temperature of the measuring place where the temperature measuring probe is located.

Description

【Technical field】 [0001] The invention belongs to the technical field of tunnels, and in particular relates to a method for detecting tunnel excavation under high ground temperature conditions. 【Background technique】 [0002] In recent years, geothermal hazards have occurred to varying degrees in the construction of deep and long tunnels in various countries. The ground temperature values ​​of some deep and long tunnels at home and abroad and the lithology of the main formations they pass through (see Table 1). It can be seen from the table that most of the deep buried long tunnels are built in relatively hard rocks, such as limestone, argillaceous limestone, sandstone, sandstone interbedded with shale, granite, gneiss, mixed rock, quartzite, Slate and more. Due to the existence of geothermal gradient, for all kinds of hard and dense rocks, due to their low thermal conductivity and poor heat transfer performance, heat energy is easy to accumulate in the rock mass. Therefore...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a tunnel excavation detection method under high ground temperature to solve the problem in the prior art that there is no definite detection method for ground temperature discrimination and detection

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