A ventilation network would be formed after opening of the cross-channel gallery when a fire happened in a highway tunnel.The ventilation network of the Lujialiang Tunnel in Chongqing was simulated for the conditions when fires happened in different positions near the inclined shaft.The simulating results show that the efficiency of the main air-blower decreases with increased volume flux when a fire happens in front of the inclined shaft due to the inclined shaft’s buoyancy and the change of wind density

and the fire smoke can be extracted through the inclined shaft;it is a good plan to install an air-blowing jet in front of the inclined shaft to increase pressure and an air-blowing jet behind the inclined shaft to increase resistance;two schemes of the whole-jetting ventilation and the centralized impressed ventilation can meet the requirement of fire-wind-flow control when a fire happens behind the inclined shaft.The centralized impressed ventilation needs turning on the axial fans

consumes more energy

but is better than the wholejetting ventilation in efficiency.