VIRTUAL SIMULATION TECHNOLOGY AND DYNAMIC RESPONSE ANALYSIS OF PE GAS PIPELINE UNDER VEHICLE LOAD
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摘要: 当前，城镇燃气管道受车辆碾压造成的事故时有发生，为分析车辆载荷下PE燃气管道的动力响应，借助虚拟样机系统仿真软件ADAMS并结合有限元分析软件研究车辆的运动载荷及受载埋地PE燃气管道的力学特征。建立车辆-路面-土体-管道模型，根据实测值对仿真结果进行了验证。基于虚拟样机系统仿真提取的车辆动态载荷谱，分析PE燃气管道的动力响应过程，并开展不同车重、不同车速下埋地PE燃气管道的动力响应规律研究。结果表明：管体所受的应力及其位移量随着车重的增大而增大；管体所受应力随着车速的增大而增大，而其位移量随着车速的增大而减小。Abstract: In order to analyze the dynamic response of PE gas pipeline under vehicle loading, the virtual prototype system simulation software ADAMS and the finite element analysis software are used to study vehicle moving loads and the mechanical characteristics of buried PE gas pipeline under the loads. A vehicle-pavement-soil-pipeline model is established, and the simulation results are verified by measured values. Based on the vehicle dynamic load spectrum extracted by virtual prototype system simulation, the dynamic response process of PE gas pipeline is analyzed, and the dynamic response law of buried PE gas pipeline under different vehicle weights and speeds is studied. The results show that: the stress and displacement of the tube increases with the increase of vehicle weight; the stress on the pipe increases with the increase of the vehicle speed, and its displacement decreases with the increase of the vehicle speed.
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图 8 管道最大应力点时长-应力曲线
Figure 8. Length - stress curve of maximum stress point of pipeline
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图 9 不同车重下最大应力-时程曲线
Figure 9. Maximum stress-time history curve under different vehicle weights
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图 10 不同车重下最大位移-管程曲线
Figure 10. Maximum displacement under different vehicle weights-pipe path curve
表 1 重型卡车参数
Table 1 Heavy truck parameters
车辆参数 轮胎参数 自重/t 载重/t 轴数/个 轮压/MPa 轴距/mm 轮距/mm 12 <70 3 0.7~1.0 2400 2040/1880 
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表 2 各轮胎动载荷系数验证
Table 2 Verify the dynamic load coefficient of each tire
车轮编号 LF LI LI2 LW LW2 RF RI RI2 RW RW2 实测值[10] 1.37 1.37 1.37 1.37 1.37 1.37 1.37 1.37 1.37 1.37 计算值 1.274 1.376 1.272 1.447 1.241 1.222 1.436 1.391 1.277 1.280 误差 −0.070 0.005 −0.072 0.056 −0.094 −0.108 0.048 0.015 −0.068 −0.066
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土体类型 密度ρ/(kg/m3) 弹性模量E1/MPa 泊松比μ 回填土 1869 20 0.4 摩擦角/(°) 流变应力比c 膨胀角φ/(°) − 36.5 1 0 −
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i 时间t/s 松弛模量E/MPa 剪切模量G/MPa 体积模量K/MPa 1 360 430.00 153.57 716.67 2 3600 320.00 114.29 533.33 3 36000 280.00 100.00 466.67 4 360000 250.00 89.59 416.67
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i 松弛时间t/s 相对剪切模量gi 相对体积模量ki 1 360 0.3807 0.3947 2 3600 0.0858 0.0713 3 36000 0.0631 0.0723 4 360000 0.0515 0.0470
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表 6 管-土模型验证
Table 6 Pipe-soil model validation
土体深度/m 模拟值/MPa 实测值/MPa[13] 误差/(%) 0.5 0.2225 0.2151 3.44 1.0 0.1342 0.1457 −7.89 1.5 0.0867 0.0886 −2.14 2.0 0.0294 0.0295 −0.33
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表 7 不同车重下管道的最大位移和最大应力
Table 7 Maximum displacement and maximum stress of different vehicle weight under pipeline
车重/t 最大位移/mm 最大位移时刻/s 最大应力/MPa 最大应力时刻/s 40 3.655 0.7875 1.841 0.8925 50 4.599 0.7875 2.041 0.8925 60 5.398 0.7875 2.178 0.8925 70 6.265 0.7875 2.284 0.8925 80 9.109 0.7875 2.916 0.8750
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表 8 不同车速下管道的最大位移和最大应力
Table 8 Maximum displacement and maximum stress of pipeline under different speed
车速m/s 最大位移/mm 最大位移时刻/s 最大应力/MPa 最大应力时刻/s 7.00 6.195 1.0250 1.997 1.2000 7.78 5.604 0.9675 2.021 1.0350 8.75 5.543 0.8600 2.113 0.9600 10.00 5.398 0.7875 2.178 0.8925 11.67 5.220 0.7200 2.254 0.7500 14.00 5.139 0.5250 2.323 0.6000
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