Abstract：Research purposes: By means of numerical simulation，the comparative research is done on supporting effects of bolt—grouting support and bolt—shotcrete support in terms of controlling tunnel deformation and expansion of plastic zone，increasing anchoring force and decreasing the stress on initial support．
Research conclusions: Based on the concrete engineering project，in this paper，a systematic analysis is made of and a comparative research is done on the supporting effects of bolt—grouting support and bolt-shotcrete support under condition of fractured soft surrounding rocks by means of numerical method．The research shows that for fracture soft surrounding rock，the bolting—grouting combined support increases the self supporting capacity of surrounding rock and the radial supposing pressure on the tunnel circumference by increasing the strength of surrounding rock and anchoring force of bolt，and it is more efficient than bolt—shotcrete support in terms of confining the deformation of surrounding rock，controlling the expansion of plastic zone，increasing anchoring force，decreasing the stress on steel arch and shotcrete，improving initial support stability．Therefore，the bolt—grouting support is especially used for supporting the fractured soft surrounding rock．
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2010, Vol. 27 
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