Advanced drilling pressure relief method for deep soft rock roadway

The invention discloses a deep soft rock roadway advanced drilling pressure relief method, and relates to the technical field of deep soft rock roadway pressure relief. The method comprises the following steps: firstly, drilling a front original soft rock by adopting a plurality of pre-arranged drill holes which are circularly arranged, then drilling through drill holes and chambering by taking the geometric center of the plurality of drill holes as a circle center, and communicating all the drill holes to form a large-diameter drill hole for deformation and stress release of surrounding rock of a roadway. According to the method, reasonable pre-arranged drilling and through drilling parameters are set, and it is ensured that hole wall periphery deformation caused by large-diameter drilling does not affect a roadway pre-digging contour line; and meanwhile, the soft rock is deformed in advance and the stress is released through advanced drilling, so that the bearing performance of the surrounding rock of the s