METHOD FOR EXCAVATING WATER-RICH TUNNEL OF HORIZONTAL JOINT ARGILLACEOUS SHALE BY DRILLING AND BLASTING METHOD

The present invention provides a method for excavating a water-rich tunnel of horizontal joint argillaceous shale by drilling and blasting method, which comprises the steps of performing surface grouting on a shallow buried section of the tunnel; drilling a pipe shed hole at a vault surrounding rock of the excavated tunnel, arranging a pipe shed in the pipe shed hole, performing advance supporting, installing a grout stop valve on the pipe shed, blocking the drilled hole and cracks around the drilled hole through an anchoring agent, and performing grouting on the pipe shed through a grouting machine; determining blasting parameters according to the actual situation of the surrounding rock and the blasting effect; wherein the blasting parameters comprise the depth, the angle and the spacing of the blast holes and the explosive load of each blast hole; sequentially loading a plurality of explosives into the blast hole, wherein emulsion explosives and bamboo chips are arranged at the center of each blast hole by arranging centralizer, so that the explosives have uniform impact force in the axial direction of the blast holes after being detonated, the blasting effect is improved, in addition, arranging a water bag to reduce dust in the blasting process, dust pollution and harm to constructors are reduced, and arranging supporting pieces to support the bamboo chips, so that the detonating cord are prevented from being damaged.