Method and device for measuring crustal stress based on hole bottom stress relief of bent drilled holes

The invention relates to the technical field of rock mechanics measurement, in particular to a method and a device for measuring crustal stress based on hole bottom stress relief of bent drilled holes, bent holes are drilled in two sides of a horizontal straight hole, a hole bottom stress relief method is adopted to obtain a strain relief value of each hole bottom, and elastic parameters of hole bottom positions are measured at the same time, the temperature effect is considered, final strain relief values and elastic parameters on three groups of hole bottom surfaces which are not parallel in space are utilized, an equation set is established for iterative solution by combining an elastic mechanical formula, and three-dimensional crustal stress data of a measurement point are calculated, so that the operation and the test are convenient, and by means of the scheme, the three-dimensional ground stress state of the actual underground engineering can be accurately measured, and the method has important guiding