Sprayed concrete and surrounding rock fracture detection device and method

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. 本发明公开了一种喷射混凝土与围岩断裂的检测装置，包括多个检测单元、引伸计和预制缝；所述检测单元位于预制缝两侧，引伸计安装在预制缝处；所述检测单元包括支架，超声波发射装