Abstract
This chapter focuses on soft rock roadway support theory and technique. The coupling support theory is proposed that emphasises the optimum combination of support structure with surrounding rock to improve its self-support capacity. Based on the roadway deformation behaviour, the best support installation time is discussed from viewpoints of theory and practice. This chapter also provides recent rock bolting mechanism advances and rebar bolt designed for soft rock roadway support. According to rock bolting failure analysis, increasing residual strength and elongating dilational slipping length of the bolt via failure modes controlling are identified as design principles of the rebar bolt for soft rock roadway support. Under consideration of the soft rock, large deformation and key factors related to residual strength of the anchorage, a new rebar bolt is designed for soft rock and large deformation roadway support. Laboratory SEPT was conducted and results showed that the peak load and energy absorption capability of the soft rock rebar bolt are 13% and 15% higher than those of commonly used left spiral bolt in China. Field tests also confirmed this result. It can be concluded that the designed rebar bolt has better anchorage performance than left spiral bolt under the soft rock and large deformation conditions.
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