For the integral anchorage structure in stability controlling of roadway＇ s surrounding rock, the mechanism of action if pretensioned bolt was analyzed. The transverse conpressional effect caused by the pretensioning force which acted on surrounding rock and was loaded by pretensioned bolt was the necessary condition as integral anchorage taking shape in surrounding rock. By making use of the Boussinnesq solution in solid mechanics, the calculating methods of stress and transverse conpressional force caused by a single pretensioned bolt in surrounding rock were researched, and the theoretical calculating formulas of transverse conpressional force caused by two pretensioned bolts and acted on the rock between these two bolts was set up. The results show that transverse conpressional force between two bolts has relationship of direct proportion with pretensioning force of bolt, and have relationship of inverse change with the distance between calculating point and the installing place of bolts. The transverse conpressional force at the position of right in the middle of two bolts is the minimum. The value of transverse conpressional force not only related to Poisson＇ s ratio of surrounding rock, but also is concerned in the bolt installing density and bolt effective length. The result obtained is applied to support designing of roadway in coal seam in Tashan Coal Mine.
Journal of China Coal Society