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Analysis of the Effect of Advanced Consolidation Grouting on Water Diversion Tunnels in Fractured Zones
1 State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University 2 Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education, Wuhan University
Abstract Geological disasters such as collapse and large deformation often occur when a water diversion tunnel passes through a water-abundant zone and soft fractured rock stratum. Aimed at this complex geological environment, a calculation method of 3D seepage stress damage coupling and an explicit fault simulation method with thin-lamina elements are put forward. The excavation and support process of an underground diversion tunnel after advanced consolidation grouting is simulated, the relative stability of a rock mass passed by the water-diversion tunnel under different conditions is quantitatively evaluated, and a contrast analysis of the rock mass failure area distribution and deformation law of the surrounding rock around tunnels with and without advanced consolidation grouting is conducted. The results show that the rock mass failure volumes and the displacements around the cavern are obviously reduced by 43.98% for the former (namely 1 252.9 m3 ) and 54.92% for the maximum displacement around a tunnel after advanced consolidation grouting. Thus, the advanced consolidation grouting significantly improves the overall stability of fault-fractured rock.
Abstract：
Geological disasters such as collapse and large deformation often occur when a water diversion tunnel passes through a water-abundant zone and soft fractured rock stratum. Aimed at this complex geological environment, a calculation method of 3D seepage stress damage coupling and an explicit fault simulation method with thin-lamina elements are put forward. The excavation and support process of an underground diversion tunnel after advanced consolidation grouting is simulated, the relative stability of a rock mass passed by the water-diversion tunnel under different conditions is quantitatively evaluated, and a contrast analysis of the rock mass failure area distribution and deformation law of the surrounding rock around tunnels with and without advanced consolidation grouting is conducted. The results show that the rock mass failure volumes and the displacements around the cavern are obviously reduced by 43.98% for the former (namely 1 252.9 m3 ) and 54.92% for the maximum displacement around a tunnel after advanced consolidation grouting. Thus, the advanced consolidation grouting significantly improves the overall stability of fault-fractured rock.
.Analysis of the Effect of Advanced Consolidation Grouting on Water Diversion Tunnels in Fractured Zones[J] MODERN TUNNELLING TECHNOLOGY, 2015,V52(2): 97-104
2015, Vol. 52 