Suhua Provincial Highway #9 Renshui Tunnel Construction & Ground Improvement

Suhua Highway Renshui Tunnel (0+371~0+400) and safety evacuation route (0+0+016~105) ground improvement of Renshui and safety evacuation route before tunnel excavation, and consolidation grouting of surrounding broken rock slope.In this work, the Double Packer grouting method was employed for low-pressure penetration, a hardening agent was introduced at low pressure or a splitting method using Double Packer grout injected into the formation. The cracks and pores were consolidated in the soil stratum to increase the soil shear strength and reduce water permeability. Thus, the strength of the formation in the grouted area tends to be uniform and the result is a consolidated ground layer, increased soil shear strength and water sealing.

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