Research conclusions：The block stone debris can be consolidated by grouting and pipe-shed support. The time of drilling through an I20-beam is between 30 mins and 90 mins when using a driller with the torque of1 200 N·m to 2 000 N·m and rotational speed of 300 rpm to 500 rpm. The grouting under the local condition of water drainage can be controlled by using compound grouting material system of sulphoaluminate cement slurry and ordinary cement-soluble glass double slurry, following the grouting sequences of from down to up, from outside to inside and grouting every other hole, conducting sectional grouting with reasonable section length and combing a certain grouting number with a certain grouting pressure. After the block stone debris is improved by grouting, it can be used as an advanced φ76 mm pipe-shed support to ensure the construction security at burst port.