Method for calculating ejection trajectory and initial speed of rock mass in indoor test

The invention relates to a method for calculating an ejection trajectory and an initial speed of a rock mass in an indoor test. The method comprises the following steps: capturing a video of a rock mass ejection process of a rock sample which is broken in a loading process of a rigid rock pressure tester by an improved high-speed photographing system; further extracting position photos of a target rock mass at different moments; calculating an actual position coordinate of the rock mass according to a relative position relation between a scale on a scale plate, a scale plate plane, an actual motion plane of the rock mass and a camera lens plane; and finally, calculating the motion trajectory and the ejection speed of the rock mass through secondary curve fitting. The accurate novel method provided by the invention is used for observing and calculating the ejection trajectory and speed of the rock mass based on the indoor test.