Rock burst is one of the disaster accidents that can easily happen in rock cavern engineering. At present, most commonly used methods to control borehole pressure relief technology. In this paper, influence drilling layout schemes on effect surrounding mass systematically studied. The research results show strength reduction degree, AE evolution characteristics, failure modes samples with diffe...

Rock burst in TBM construction will have a great influence on the safety and speed. At same time, there are few practical projects using micro-seismic monitoring, accuracy of prediction is not satisfactory. Therefore, this paper was based large number monitoring reports data from two hard rock China. The actual situation continuously tracked recorded site for comparison verification. statistica...

The series of acoustic emission events from loaded rock samples were studied by means of correlation analysis. As characteristic parameters of the correlation functions were chosen: the first values of the autocorrelation coefficients, the number of positive autocorrelation coefficients and the linearity of the autocorrelation function. The increase in the values of the autocorrelation coeffici...

On a recent program night, third-grader Tyrell came to speak with Ms. Dee, our COO. He had received a mattress at Christmas and was now very happy to have his own place to sleep. Tyrell’s mom is out of the house, and he and his siblings live with Granny. He proceeded to tell Ms. Dee his dream of having his mattress “put up” (which meant with a frame and box spring) but wasn’t sure how this was ...

When rocks are subjected to stress, dormant electronic charge carriers are activated. They turn the stressed rock volume into a battery, from where currents can flow out. The charge carriers are electrons and defect electrons, also known as positive holes or pholes for short. The boundary between stressed and unstressed rock acts as a potential barrier that lets pholes pass but blocks electrons...