According to the deformation characteristic of surrounding rock in deep thick top coal roadway

guided by the support idea of controlling at first

pressure yielding behind and then resistance

four schemes of pressure relief anchor cable box beam support system are designed

of which beam arrangement mode are lateral beam

longitudinal single beam

longitudinal double beams and longitudinal-lateral combined beam respectively. The results of numerical test show that

among the four schemes

longitudinal-lateral combined beam scheme is best in surrounding rock controlling; lateral beam scheme is relatively worst. The four schemes are applied to field test. The monitoring results show that the surrounding rock deformation of test section with longitudinal-lateral combined beam scheme is least; the sides deformation is 120 mm and the roof deformation is 90 mm. Meanwhile

bolts and anchor cables have the largest supporting reaction in this scheme. The force measuring anchor cable box beams are designed and made. The monitoring results show that box beam stress conditions are reasonable and coordinate

material is used fully. In the four schemes

supporting and protecting components reaction corresponding with the effect of the roadway control

and the effect of anchor cable yielding ring is obvious. Mechanisms of support systems are analyzed. Under the geological conditions of deep thick top coal roadway

longitudinal-lateral combined beam and longitudinal single beam schemes of pressure relief anchor cable box beam support system are better for controlling surrouding rock deformation in a cost-effective way; and the supporting demand is satisfied.