Sprayed concrete and surrounding rock fracture detection device and method

Abstract

The invention discloses a sprayed concrete and surrounding rock fracture detection device. The detection device comprises a plurality of detection units, an extensometer and a prefabricated joint. Thedetection units are located on two sides of the prefabricated joint, and the extensometer is installed at the prefabricated joint. Each detection unit comprises a bracket, an ultrasonic transmittingdevice and an ultrasonic receiving device; and the ultrasonic transmitting device and the ultrasonic receiving device are mounted on the bracket. The device can be used for detecting damage in the sprayed concrete and the surrounding rock. The invention further discloses a sprayed concrete and surrounding rock fracture detection method, on the basis of ensuring a lossless state, a crack initiationtime point of sprayed concrete and surrounding rock fracture can be measured, and then whole-process evolution of fracture damage is obtained.

Description

technical field [0001] The invention relates to a detection device and detection method for shotcrete and surrounding rock fractures, belonging to the field of concrete structures and materials. Background technique [0002] During the construction of water tunnels, shotcrete is widely used in the construction method of the construction site support structure due to its fast and effective advantages. However, since the bonding structure between shotcrete and surrounding rock is the main weak link of the entire lining structure, the interaction between surrounding rock and shotcrete is a key issue in tunnel construction, which is directly related to the tunnel construction process and service period. Security, stability. The geological conditions of the tunnel are complex and varied, and the surrounding rock, which is part of the lining structure of the water conveyance tunnel, will inevitably have initial damage during the tunnel excavation process. And under the complex s...

AI Technical Summary

Problems solved by technology

[0003] However, the current detection devices for fracture damage of shotcrete and surrounding rock can only observe the development process of apparent cracks, but cannot detect the damage inside shotcrete and surrounding rock.

At the same time, some non-destructive testing methods in the existing technology cannot effectively judge the time point of crack initiation of the test piece during the test, so that the whole process of fracture damage cannot be clearly understood.

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