Excavation footage control method based on three-arm drill jumbo

The invention discloses an excavation footage control method based on a three-arm drill jumbo, which relates to the technical field of tunnel construction, and comprises the following steps: step 1, drilling holes at the upper step of a to-be-constructed tunnel by adopting the three-arm drill jumbo; secondly, the drilling data in the first step are collected, the collected drilling data are compared with calculation data in a computer, and besides a data comparison mode, the collected drilling data can be directly substituted into an algorithm formula of the method; and 3, based on the comparison result of the collected drilling data and the calculation data, the hardness and crushing conditions of the surrounding rock are judged, and the tunnel excavation footage is guided accordingly. The real-time drilling rate and depth of the three-arm drill jumbo are combined, the situation of surrounding rock in front is reflected from the side face, meanwhile, traditional advanced geological forecast is combined, data