Abstract
Understanding the distribution of pore pressure and predicting water inflow are critical in tunnel engineering. In this study, the numerical solutions obtained by ABAQUS are compared with the theoretical solutions derived using the complex variable method (CVM). This comparison clarifies the influence of assuming a constant total hydraulic head along the interface between the grouted zone and soil on the theoretical solutions of pore pressure and water inflow calculated by the CVM. Results show that assuming a constant total hydraulic head can cause the negative and positive deviations with approximately equal areas in the total hydraulic head regardless of the permeability of the grouted zone and soil. Consequently, the theoretical solution invariably approaches the numerical solution for water inflow even when the deviation of the total hydraulic head is considerable. Relative permeability, kr/kg (where kg and kr represent the permeability coefficient of the grouted zone and soil, respectively), has a significant influence on the deviation of pore pressure. When the relative permeability is large, the pore pressure deviation is acceptable. As the relative permeability increases or the water depth (hw) decreases, the total hydraulic head and pore pressure deviations decrease gradually.
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