On the basis of author’s two on-the-spot consultant experiences and the collected data, this
paper discusses ecological environment problems, such as groundwater resources loss, poor coal-measure
water intrusion and hydrologic cycle unbalance, which are caused by discharge from the tunnel, and their
formation mechanisms. It also discusses a series of negative effects resulted, such as karst spring water
depletion, groundwater degradation, surface water pollution and soil erosion. Analysis results showthat the
long-term discharge of the tunnel will produce large-scale cone of depression, and that the expansion of the
cone will lead to the happening of intense hydrogeochemical action in drainage belt, hence bringing a threat
to the stability of the tunnel lining.