Effect of tunnel excavation on groundwater environment based on three-dimensional unsteady seepage flow analysis
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Abstract:
During the construction process of tunnel excavation in a hydro-project, the method of all excavation completed before lining was commonly used. As for the seepage flow stability calculation on tunnel excavation temporary state to impact groundwater environment, which is not in line with the actual situation, and often amplifies the water level fluctuation and effective range. In view of this, adopting the technique of unsteady seepage numerical simulation to assess the impact on groundwater environment will be more reasonable. Taking the construction process of a diversion tunnel as an example, based on unsteady saturated and unsaturated seepage theory, the three-dimensional finite element numerical model was established to calculate the transient seepage field of tunnel excavation area. The tunnel groundwater variation from commencement to completion of works was summarized. Groundwater environmental impact assessment on the process of tunnel excavation was done. The results showed that (1) it was feasible to predict the process of water level falling and affective range enlarging by three-dimensional unsteady seepage flow analysis; (2) the groundwater in this region was less effected by excavation of diversion tunnel and groundwater recharge and discharge relations remained unchanged.
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