Abstract To study the performance of smoke control in tunnels with roof openings under the conditions of natural ventilation and various combinations of shaft parameters, a series of orthogonal experiments were conducted. Taking the shaft width, height, group space and the number of the shaft as the controllable factors and the maximum smoke temperature under the tunnel ceiling, smoke diffusion rate and smoke sedimentation rate as the evaluation index,some optimized schemes, which aim at lowering the maximum smoke temperature under the tunnel ceiling and reducing the smoking diffusion rate and smoke sedimentation rate, were obtained. The results show that the temperature around the tunnel ceiling is lower than 100�� in each case; the shaft width has the largest influence on the maximum smoke temperature around the ceiling; the shaft height has a large influence on both the smoke diffusion rate and the smoke sedimentation rate; and the shaft group space affects the smoke diffusion rate significantly
Abstract��
To study the performance of smoke control in tunnels with roof openings under the conditions of natural ventilation and various combinations of shaft parameters, a series of orthogonal experiments were conducted. Taking the shaft width, height, group space and the number of the shaft as the controllable factors and the maximum smoke temperature under the tunnel ceiling, smoke diffusion rate and smoke sedimentation rate as the evaluation index,some optimized schemes, which aim at lowering the maximum smoke temperature under the tunnel ceiling and reducing the smoking diffusion rate and smoke sedimentation rate, were obtained. The results show that the temperature around the tunnel ceiling is lower than 100�� in each case; the shaft width has the largest influence on the maximum smoke temperature around the ceiling; the shaft height has a large influence on both the smoke diffusion rate and the smoke sedimentation rate; and the shaft group space affects the smoke diffusion rate significantly
.Small-Scale Model Experiments for Fires in Tunnels with Roof Openings Based on Orthogonal Design[J] MODERN TUNNELLING TECHNOLOGY, 2017,V54(2): 163-169
2017, Vol. 54 