Abstract: Due to the excavation of roadway, the occurrence mode of water in the fractures of roof strata has changed, which has significantly decreased the strength of roof rock mass under the action of water and tends to induce large deformation of roof even loss of its stability. Field measurement on the occurrence position of roof effluent water and development law of surrounding rock internal fractures has been conducted in water-enriched roadway, and research has also been done on flow characteristics of roof water and variation law of pore water pressure as well as the influences of roof support intensity on the flow characteristics of roof water by means of numerical simulation under the following three conditions, no drain hole existing in the roof, drain hole existing in the roof and drain hole crossing the fissure-plane of roof strata, respectively. Research results have indicated that the occurrence position of roof effluent water locates in the developing area of fissures and it is conducive to drain roof water and control the stability of roof surrounding rock by reasonably arranging technical parameters of water drainage. Based on the above research, the technological principles of controllable water draining and reasonable water retention have been put forward and engineering application has also been conducted.

Key words: water-enriched roadway, roof water, controllable water draining, reasonable water re- tention