Experimental method for simulating impact rock-burst

An experimental method for simulating an impact rockburst, the method comprising:

• S1:
• making a rock sample specimen having a through hole or a half hole;
• S2:
• loading initial static stresses of three directions onto the rock sample specimen, and maintaining the initial static stresses of the three directions, to simulate a situation that an excavated tunnel suffers the static stresses;
• S3:
• loading dynamic load(s) of one direction, two directions or three directions onto the rock sample specimen by 0.5-10 minutes, so as to determine whether a spalling phenomenon appears on an internal surface of the through hole or the half hole, wherein the dynamic load is used to simulate the disturbance wave induced by an excavation, a blasting, an earthquake or a mechanical vibration;
• S4:
• under an action of the dynamic load in the step S3, if it is determined that the spalling phenomenon appears on the internal surface of the hole, unceasingly maintaining a state of loading the dynamic load in the step S3 by 0.5-10 minutes, to determine whether the rock sample specimen is further damaged, and if the rock sample specimen is not further damaged, stopping the loading the dynamic load, and increasing the static stress(es) of one direction, two directions or three directions loaded onto the rock sample specimen, then repeating the step S2 and the following experimental steps, and if the rock sample specimen goes into a failure course, determining and recording the failure course, and ending the experiment of the impact rockburst;
• and
• S5:
• under the action of the dynamic load in the step S3, if it is determined that no spalling phenomenon appears on the internal surface of the hole, unceasingly maintaining the state of loading the dynamic load in the step S3 by 2-10 minutes, to determine whether the spalling phenomenon appears in the rock sample specimen, and if it is determined that the spalling phenomenon appears on the internal surface of the hole of the rock sample specimen, repeating the step S4 and the following experimental steps, and if it is determined that no spalling phenomenon appears on the internal surface of the hole of the rock sample specimen, stopping the loading the dynamic load, and increasing the static stress(es) of the one direction, the two directions or the three directions loaded onto the rock sample specimen, then repeating the step S2 and the following experimental steps, and if the rock sample specimen goes into the failure course, determining and recording the failure course, and ending the experiment of the impact rockburst.