Risk assessment of metro operation based on G1-EW combination weighting cloud model

doi:10.16265/j.cnki.issn1003-3033.2022.06.0947

Abstract

Abstract:

In order to effectively control risks of metro operation, a cloud modeling method and combination weighting technology were introduced, and a risk assessment model was established considering features of metro operation safety. With a subway line in Xi'an is as research background, a three-level index system of risk evaluation was constructed, and comprehensive weight coefficients of each index were determined based on Euclidean distance combination and by using G1 method and EW method. Secondly, based on quantitative grading criteria of each index, numerical characteristics of clouds were determined and cloud maps were generated by utilizing Matlab. Finally, certainty degree of indexes was determined through forward cloud generators. The results show that the proposed risk assessment model can not only reduce subjective randomness, but also eliminate single objective error. Safety risk levels of T₁- T₄ operating lines under its jurisdiction are medium (V₃), low (V₂), low (V₁) and medium (V₃), which are in good agreement with actual evaluation results.

Key words: sequential relationship analysis (G1) method, entropy weight (EW) method, combination weighting cloud model, metro operation, safety risk assessment

ZHANG Miao. Risk assessment of metro operation based on G1-EW combination weighting cloud model[J]. China Safety Science Journal, 2022, 32(6): 163-170.

Figures/Tables 7

Tab.1

Evaluation guidelines for metro operational safety risk evaluation indicators

二级指标U_i	三级指标U_ij		评价准则		风险等级
二级指标U_i	三级指标U_ij		评价准则		低(V₁)		较低(V₂)		中等(V₃)		较高(V₄)	高(V₅)
城市人口因素 U₁	客流站台饱和度U₁₁	平均到达率/服务速率		≤0.1		(0.1,0.3]		(0.3,0.5]		(0.5,0.8]		>0.8
	客流超高峰系数U₁₂	超高峰时段进站或出站人次高峰小时进站或出站人次		≤1.1		(1.1,1.2]		(1.2,1.3]		(1.3,1.4]		>1.4
	客流最大波动系数U₁₃	波动系数		≤1.2		(1.2,1.3]		(1.3,1.4]		(1.4,1.5]		>1.5
	客流楼梯拥挤度U₁₄	楼梯拥堵程度/%		≤0.15		(0.15,0.3]		(0.3,0.45]		(0.45,0.6]		>0.6
	客流通道拥挤度U₁₅	通道拥堵程度/%		≤0.15		(0.15,0.3]		(0.3,0.45]		(0.45,0.6]		>0.6
地铁设备设施 U₂	车辆系统故障率U₂₁	设备故障时间/总运行时间/%		≤5		(5,10]		(10,15]		(15,20]		>20
	供电系统故障率U₂₂	设备故障时间/总运行时间/%		≤5		(5,10]		(10,15]		(15,20]		>20
	线路轨道故障率U₂₃	设备故障时间/总运行时间/%		≤5		(5,10]		(10,15]		(15,20]		>20
二级指标U_i	三级指标U_ij		评价准则		风险等级
二级指标U_i	三级指标U_ij		评价准则		低(V₁)		较低(V₂)		中等(V₃)		较高(V₄)	高(V₅)
	机电设备合格率U₂₄	维护保养合格率/%		>90		(80,90]		(70,80]		(60,70]		≤60
	通信设备合格率U₂₅	维护保养合格率/%		>90		(80,90]		(70,80]		(60,70]		≤60
	监测设备合格率U₂₆	维护保养合格率/%		>90		(80,90]		(70,80]		(60,70]		≤60
	消防设施更新率U₂₇	设备更换频率/%		>90		(80,90]		(70,80]		(60,70]		≤60
地铁安全管理 U₃	安全规章制度完善性U₃₁	实际规章制度条数/ 规定规章制度条数/%		>90		(80,90]		(70,80]		(60,70]		≤60
	安全管理规程落实性U₃₂	实际落实文件数/ 规定制度文件数/%		>90		(80,90]		(70,80]		(60,70]		≤60
	安全技术人员配备率U₃₃	实际配备数量/规定配备数量/%		>95		(90,95]		(85,90]		(80,85]		≤80
	安全教育培训情况U₃₄	教育培训学时/h		>96		(48,96]		(24,48]		(12,24]		≤12
	安全技术考核达标率U₃₅	考核达标率/%		>95		(90,95]		(85,90]		(80,85]		≤80
	应急预案完善性U₃₆	实际应急预案条数/ 规定应急预案条数/%		>90		(80,90]		(70,80]		(60,70]		≤60
	应急演练频率U₃₇	频率/(次·a^-1)		>36		(24,36]		(12,24]		(6,12]		≤6
	应急救援便捷性 $U 3 8$	便捷程度		优(5)		良(4)		中等(3)		合格(2)		差(1)
地铁环境因素 U₄	噪声控制合规率U₄₁	环境噪声级/dB		≤80		(80,85]		(85,90]		(90,95]		>95
	地铁通风合格率U₄₂	空气危害程度		无害(5)		较无害(4)		中等(3)		轻度(2)		重度(1)
	引导标志完善率U₄₃	有效标识数量/规定标识数量/%		>95		(90,95]		(85,90]		(80,85]		≤80
	自然灾害频率U₄₄	频率程度		几乎不(5)		极少(4)		偶尔(3)		较少(2)		经常(1)

Tab.1

Tab.2

Tab.3

Fig.1

Tab.4

Tab.5

Fig.2

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评价指标	V₁(E_n,E_x,H_e)	V₂(E_n,E_x,H_e)	V₃(E_n,E_x,H_e)	V₄(E_n,E_x,H_e)	V₅(E_n,E_x,H_e)
客流站台饱和度U₁₁	(0.05,0.016 7, 0.000 835)	(0.2,0.033, 0.001 65)	(0.4,0.033, 0.001 65)	(0.65,0.05, 0.002 5)	(0.8,0.05, 0.002 5)
客流超高峰系数U₁₂	(0.55,0.183, 0.009 15)	(1.15,0.016 7, 0.000 84)	(1.25,0.016 7, 0.000 84)	(1.35,0.016 7, 0.000 84)	(1.4,0.0167, 0.000 84)
客流最大波动系数U₁₃	(0.6,0.2, 0.01)	(1.25,0.016 7, 0.000 84)	(1.35,0.016 7, 0.000 84)	(1.45,0.0167, 0.000 84)	(1.5,0.0167, 0.000 84)
客流楼道拥挤度U₁₄	(0.075,0.025, 0.001 25)	(0.225,0.025, 0.001 25)	(0.375,0.025, 0.001 25)	(0.525,0.025, 0.001 25)	(0.6,0.025, 0.001 25)
客流通道拥挤度U₁₅	(0.075,0.025, 0.001 25)	(0.225,0.025, 0.001 25)	(0.375,0.025, 0.001 25)	(0.525,0.025, 0.001 25)	(0.6,0.025, 0.001 25)

指标	U₁₁	U₁₂	U₁₃	U₁₄	U₁₅	U₂₁	U₂₂	U₂₃	U₂₄	U₂₅	U₂₆	U₂₇
G1	0.035 3	0.038 8	0.050 3	0.073 2	0.066 6	0.030 8	0.088 8	0.103 1	0.048 7	0.088 2	0.036 7	0.073 1
EW	0.042 9	0.035 9	0.044 0	0.036 6	0.040 9	0.031 8	0.034 8	0.049 1	0.035 5	0.047 1	0.035 9	0.049 7
组合权重	0.039 0	0.037 4	0.047 2	0.055 2	0.053 9	0.031 3	0.062 2	0.076 4	0.042 2	0.067 9	0.036 3	0.061 6
指标	U₃₁	U₃₂	U₃₃	U₃₄	U₃₅	U₃₆	U₃₇	U₃₈	U₄₁	U₄₂	U₄₃	U₄₄
G1	0.012 6	0.012 1	0.014 5	0.026 3	0.027 9	0.018 1	0.023 1	0.041	0.009 4	0.014 5	0.036	0.030 8
EW	0.030 6	0.029 4	0.031 5	0.031 7	0.031 2	0.056 9	0.051 1	0.050 5	0.050 3	0.058 5	0.032 5	0.061 8
组合权重	0.021 5	0.020 6	0.022 9	0.029 0	0.029 5	0.037 2	0.036 9	0.045 7	0.029 6	0.036 2	0.034 3	0.046 1

二级指标	云模型综合确定度
二级指标	低 (V₁)	较低 (V₂)	中等 (V₃)	较高 (V₄)	高 (V₅)
城市人口因素(U₂)	0.000 1	0.007 9	0.064 2	0.000 8	0.000 0
地铁设备设施(U₃)	0.004 4	0.000 0	0.050 2	0.000 0	0.000 0
地铁安全管理(U₄)	0.038 3	0.031 1	0.006 6	0.000 0	0.000 2
地铁环境因素(U₅)	0.017 5	0.000 0	0.024 5	0.000 0	0.000 0
T₁线路地铁	0.013 6	0.009 4	0.039 1	0.000 2	0.000 1