Stability analysis of two sides of roadway supported with bolts

Abstract：Bolting is a conceal engineering.The stability of surrounding rock around roadway is very important.Based on the variety characteristics of surrounding rock stress around roadway and similitude material simulation tests, the deformation and failure feature of bolted rock body are analyzed.It points out the tension fracture occurrence in the surface of two sides of roadway using bolt and shear fracture occurrence inside the bolted rock body.The model analyzing the stability of two sides of roadway supported with bolted is hereby built up, and a criterion judging the stability of its two sides is proposed.Namely, tensile strain of bolt in the bolted rock body must be less than its permissible value.The circumference displacement is also satisfactory in soft rock.

Keyword：bolting;stability;judge criterion;