Tunnel surrounding rock temperature field test device for high-speed railway in severe cold area and burying method thereof

Abstract

The invention discloses a tunnel surrounding rock temperature field test device for a high-speed railway in a severe cold area and a burying method thereof. The test device is composed of a PPR pipe and an exhaust pipe arranged in side by side. One end of the PPR pipe is a slurry output end, and the other end of the PPR pipe is a slurry input end. The end portion of the slurry output end is designed as a slope. The length of the exhaust pipe is less than the length of the PPR pipe. The end of the exhaust pipe close to the slurry input end is an air outtake end. The end of the exhaust pipe close to the slurry output end is an air intake end. The PPR pipe and the exhaust pipe are placed in a temperature measuring drill hole of the inner wall of a tunnel. The slurry output end is located at the bottom of the drill hole. The slurry output end and the air outtake end of the exhaust pipe are located outside the drill hole. One or more temperature sensors are arranged on the outer wall of thePPR pipe along the length thereof. The leads of the sensors are located externally to be connected to a peripheral acquisition device. During a pouring process, the exhaust pipe is configured to exhaust the air out of the drill hole. The test device can accurately test the temperature at different surrounding rock depths, ensure test accuracy, and ensure the safety of a tunnel structure.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a temperature field testing device for the surrounding rock of a high-speed railway tunnel in severe cold regions and an embedding method thereof. Background technique [0002] With more and more high-speed railway tunnels being built in severe cold areas, the current domestic research on freezing damage of high-speed railway tunnels in severe cold areas is not comprehensive enough, and there is a lack of design basis for anti-freezing and heat preservation. Comprehensive tunnel temperature field tests have been carried out, and theoretical analysis and numerical calculations have been carried out. , to reveal the spatiotemporal variation of the temperature field of high-speed railway tunnels in severe cold regions, analyze and evaluate the influence of different factors on the temperature field of tunnels, and provide a basis for thermal insulation design ...

AI Technical Summary

Problems solved by technology

[0003] At present, the installation of tunnel surrounding rock temperature testing components is mostly sealed with strip anchoring agent. Since the strip anchoring agent has a very short consolidation time and basically has no fluidity, the temperature measurement hole will not be dense and there will be gaps, which will affect the temperature. Test accuracy; at the same time, if the backfill of the temperature measuring hole is not dense, water leakage will easily occur. In winter, the leakage water will cause icing and frost heaving, damage the tunnel structure, and affect the safety of train operation

[0004] In addition, anchor cables and anchor rods are used as rods for binding temperature sensors. Due to the high thermal conductivity of anchor rods and anchor cables, the heat of surrounding rock is transmitted through anchor rods and anchor cables, which affects the test accuracy of temperature sensors at different depths.

Images