Abstract: The sounding rock of Ⅲ-Level South Roadway was significantly affected by geological structure, lower roadway sounding rock strength, higher content of clay minerals, and serious argillization. Combined with deformation characteristics of South Roadway, the combined support of bolt and steel tubular confined concrete support (STCCS) has been designed as follows: roadway section is in horseshoe, with Φ20 mm×L1800 mm L-steel bolt, STCCS constituted by Φ194 mm×L8 mm seamless steel tube and C40 core concrete. Combined with theoretical calculation, the ultimate bearing capacity of the designed support programs is greater than the surrounding rock load of South Roadway, which can maintain the stability of roadway surrounding rock. By numerical analysis and on-site monitoring analysis, the final deformation of roadway sounding rock is small after roadway support scheme has been applied. The support force of bolt and STCCS was less than their limit load. Consequently, roadway support is stable and reliable. So the support programs reached the soft roadway support requirement of Ⅲ-Level South Roadway.

Key words: soft rock roadway, STCCS, theoretical analysis, numerical simulation