Nondestructive testing on cumulative damage of watery fractured rock mass under multiple cycle blasting

Field and rock-like materials model tests are carried out to analyze the cumulative damage law of tunnel surrounding rock and watery fractured rock under multiple cycle blasting. A probability and statistics method is used to quantitatively analyze the cumulative blasting damage and the energy distribution. According to the ultrasonic test data and statistical results, the influence range of blasting impact on tunnel surrounding rock is within 1.2 m. In rock-like materials models, the phenomena of water inrush and sudden failure appear respectively after the 8th and 9th blasting tests, which indicates the nonlinear variation of cumulative damage in watery fractured rock mass.

Automated summary

Field and rock-like materials model tests were conducted to analyze the cumulative damage of tunnel surrounding rock and watery fractured rock under multiple cycle blasting. The influence range of blasting on tunnel surrounding rock was found to be within 1.2 m, and nonlinear variations of cumulative damage were observed in watery fractured rock mass.