Abstract The stability of a tunnel depends on the accuracy of the rock mass classification made during the course of its construction. The normal Q value method was modified after analyzing various rock classification methods. Based on the particularities of a long, deep tunnel located at large faults in a carbonate area, the modified Q value method was put forward in respect to the macro influence coefficients of fault, fold, topography, and karst, and the formula for the modified Q value was obtained accordingly. Based on the verification and analysis of the Dapingshan Tunnel, it was concluded that the higher the classification of rock mass at great depth, the poorer the rock mass near the fault, which means that the formula results are practically identical to the actual ones.
Abstract：
The stability of a tunnel depends on the accuracy of the rock mass classification made during the course of its construction. The normal Q value method was modified after analyzing various rock classification methods. Based on the particularities of a long, deep tunnel located at large faults in a carbonate area, the modified Q value method was put forward in respect to the macro influence coefficients of fault, fold, topography, and karst, and the formula for the modified Q value was obtained accordingly. Based on the verification and analysis of the Dapingshan Tunnel, it was concluded that the higher the classification of rock mass at great depth, the poorer the rock mass near the fault, which means that the formula results are practically identical to the actual ones.
.On the Application of a Modified Q-Value Classification to a Long, Deep Tunnel Near Large Faults in a Carbonate Area[J] MODERN TUNNELLING TECHNOLOGY, 2013,V50(3): 32-39
2013, Vol. 50 