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In the fire research of cable compartment of utility tunnel, the method of introducing correction coefficient is adopted to calculate the fire source HRR and establish the model of fire HRR, as shown in Eq (3).

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Ji J, Bi Y, Venkatasubbaiah K, et al. Influence of aspect ratio of tunnel on smoke temperature distribution under ceiling in near field of fire source[J]. Applied Thermal Engineering, 2016, 106: 1094–1102. Mohamed, N.; Nehdi, M.L. Rational finite element assisted design of precast steel fiber reinforced concrete pipes. Eng. Struct. 2016, 124, 196–206. [ Google Scholar] [ CrossRef]

Durasteel cable barrier systems can be designed to incorporate hatches and doors, or to be demountable allowing access to the interior. Invicta can supply a full range of penetration seal systems which can be used to ensure maintenance of compartmentation where services pass through barriers. Previous studies mostly used numerical simulation methods to study the characteristics of tunnel fire [ 5]. Zhao [ 6] proposed a simplified model of corridor ceiling jet behavior. The model is verified by numerical calculation. For the radial expansion zone, the Alpert equation is simplified and the simplified solution is obtained. Ji [ 7] studied the influence of tunnel aspect ratio on smoke temperature distribution near the ceiling of the fire source area. The results showed that the tunnel width had little influence on the smoke mass loss rate and the maximum smoke temperature, but had a great influence on the smoke temperature distribution. Vaquelin and Wu [ 8] and van Maele and Merci [ 9] found that the critical ventilation velocity was related to the tunnel width of Computational Fluid Dynamics (CFD). The Fire Dynamics Simulator (FDS) solved the problems of smoke propagation and heat transfer in fire [ 10]. However, for the simulation of cable compartment, a large number of grids need to be established for long-time simulation. The length of the near fire source region is a key factor in the simulation method. However, it is not commonly used in the numerical simulation of smoke propagation in cable compartment.Zhao W, Zong R, Wei T, et al. The physical model and validation study of ceiling-jet flow in near-field of corridor fires[J]. International Journal of Heat and Mass Transfer, 2015, 88: 91–100. In cases 1, 5 and 6, it can be seen that when the fuel quantity is 40 ml, in case 1 and 6 without cable, the maximum ceiling temperature reaches 90°C in a relatively long time, and the fuel quantity affects the maximum temperature, which is 0.5 m below the ceiling. When the fuel quantity is 10 ml, the maximum temperature below the ceiling of RVVR ignition cable is about 74°C, which is lower than the maximum temperature 77°C below the ceiling of ZRYJV ignition cable 0.5 m away from the fire source when the fuel quantity is 40 ml. In this paper, the maximum smoke temperature of ceiling caused by fire under the condition of natural ventilation in the cable compartment of utility tunnel is experimentally studied. The fire source of the oil pool is located on one side of the cable compartment of the utility tunnel, forming a fire near the wall. The effects of combustion time, oil pool, vertical height of fire source and ZRYJV cable combustion on combustion are studied. In fact, this fire scenario is more common in the cable compartment of utility tunnel. Through the fire model test of the cable compartment in the utility tunnel, the smoke temperature distribution caused by fire under different HRR and cable types is simulated.