ISSN 2096-4498
CN 44-1745/U
Tunnel Construction ›› 2018, Vol. 38 ›› Issue (8): 1279-1285.DOI: 10.3973/j.issn.2096-4498.2018.08.003
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WANG Mingnian1, 2, DENG Tao1, 2, YU Li1, 2, *
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Abstract:
It is very important to obtain the distance between ventilation pipe outlet and tunnel face (short for the ventilation pipe distance) and the influencing laws of outlet volume of ventilation pipe on construction ventilation time. Hence, the minimum construction ventilation time of ventilation pipes with ventilation pipe distances of 1D, 2D, 3D and 4D, where D is equivalent diameter of tunnel crosssection, and 4 kinds of outlet volumes of 2 000 m3/min, 2 500 m3/min, 3 000 m3/min and 3 500 m3/min are studied by computational fluid dynamics (CFD) simulation, by taking mechanically constructed large crosssectional ZhenzhouWanzhou highspeed railway tunnel for example. The study results show that the construction ventilation time can be affected by ventilation pipe distance and outlet volume of ventilation pipe; the relationship between the construction ventilation time (t) and ventilation pipe distance (x) can be represented as t=ax2+bx+c, where a, b and c are functionally related to outlet volume of ventilation pipe (Q); the relationship among the construction ventilation time (t), ventilation pipe distance (x) and outlet volume of ventilation pipe (Q) can be represented as t=f(Q)x2+g(Q)x+h(Q), which is apply to the prediction of construction ventilation time of Xiangjiawan Tunnel. The study results are of great significance to theoretical guidance of determination of mechanized construction ventilation time of ZhengzhouWanzhou highspeed railway tunnel.
Key words: highspeed railway tunnel, large crosssectional tunnel, construction ventilation, ventilation time, outlet volume of ventilation pipe, distance between ventilation pipe outlet and tunnel face, computational fluid dynamics (CFD) simulation
CLC Number:
U 45
WANG Mingnian, DENG Tao, YU Li. Study of Theoretical Prediction Method for Construction Ventilation Time Required for Largesectional Highspeed Railway Tunnel[J]. Tunnel Construction, 2018, 38(8): 1279-1285.
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