Abstract
According to the structural mechanics model of gob-side roadway retaining overlying strata, the paper analyzed the deformation characteristics of surrounding rock and the stress characteristics of filling body in the two stages and obtained the basic requirements for roadside filling body to keep the stability of gob-side roadway retaining as follows. The ultimate bearing capacity of filling body should enough to cutting off the key bock B beside the goaf, and has a large deformation capacity during overlying strata movement and a high post-strength after stability of overlying strata movement. Based on above investigations and the geological conditions of W1305 panel in Gaohe coal mine, a new roadside support method named as pier column which is built with high-water material is innovatively proposed in this study. The site test showed that after the roof strata above the gob-side roadway retaining were stability, the surrounding rock of the roadway retaining and the pier column would be stabilized and the deformation value would be small. All these research results could have certain guidance to the practices of gob-side roadway retaining.
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