Calibration Method of Bi-block Ballastless Track Monitoring on Sleeper Pressure
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摘要:
为探寻双块式无砟轨道枕上压力的长期监测方法，以CRTSⅠ型双块式轨枕为研究对象，首次利用埋入式光纤光栅传感器研究了双块式轨枕内部应变值和枕上压力的线性关系. 首先，在轨枕制造阶段埋入FRP-OF光纤光栅应变传感器，用于测试轨枕内部应变变化；其次，通过反力架和千斤顶对轨枕进行静力加载标定，分析轨枕表面加载力和轨枕内部应变的线性关系；最后，通过有限元仿真进行验证和修正. 结果表明：在轨枕表面施加的载荷和轨枕内部光纤光栅应变传感器的测试值具有良好线性关系，将此线性斜率确定为标定系数（4.90～5.28 kN/μ
ε ），仿真数据与实测数据的误差在5%以内；对比轨枕在反力架约束和在道床板约束两种不同边界条件工况下的枕内应变，修正了枕上压力计算式，提出了一种基于双块式轨枕内部应变的枕上压力计算方法，并在高速铁路运营线路上测得枕上压力约为30～42 kN；该方法为高速铁路轮轨荷载传递研究、无砟轨道结构的强度计算理论和方法的完善以及列车轮对状态监测提供重要依据.Abstract:In order to explore the long-term monitoring method of bi-block ballastless track sleeper pressure, this paper took the CRTSⅠ bi-block sleeper as the research object and studied the linear relationship between the internal strain values and the sleeper pressure by using the embedded fiber Bragg grating sensor. Firstly, the fiber reinforced polymer-optical fiber (FRP-OF) strain sensor was embedded in the sleeper at the manufacturing stage. Secondly, the sleeper was calibrated under static load by the reaction rack and jack, and the linear relationship between the surface loading force and the internal strain of the sleeper was analyzed. Finally, the finite element simulation was used for verification and correction. The results show that the load applied on the sleeper surface has a good linear relationship with the measured value of the FRP-OF strain sensor inside the sleeper. The slope of this linearity is determined as the calibration coefficient, with a range of about 4.90–5.28 kN/μ
ε . The error rate between simulation data and measured data is within 5%. The internal strains of the sleeper are compared under two different boundary conditions: reaction frame constraint and track slab constraint, and the equation for calculating sleeper pressure is corrected. As a result, a calculation method of sleeper pressure based on the internal strain of a bi-block sleeper is presented, and the sleeper pressure measured on a high-speed railway operating line is about 30–42 kN. This method provides an important basis for studying the wheel/rail force transfer, improving strength calculation theory and method of ballastless track structures, and monitoring the condition of wheels of high-speed railways. -
图 2 FRP-OF应变传感器结构及其工作原理
Figure 2. Structure of FRP-OF strain sensor and its working principle
图 3 双块式轨枕结构以及传感器埋设位置示意
Figure 3. Bi-block sleeper structure and sensor embedment position
图 4 双块式轨枕生产阶段安装传感器示意
Figure 4. Schematic diagram of installing sensor in production stage of bi-block sleeper
图 10 反力架标定试验数据与仿真数据对比
Figure 10. Comparison of reaction frame calibration test data and simulation data
图 12 反力架约束工况和实际工况枕内应变数值线性拟合
Figure 12. Linear fitting of strain values under reaction frame constraint condition and actual condition
图 13 高速铁路运营线路现场测试数据时程
Figure 13. Time history diagram of field test data from high-speed railway operating line
表 1 FRP-OF应变传感器技术参数
Table 1. Technical parameters of FRP-OF strain sensor
传感器技术参数 数值 量程/με −1500～3 000 分辨率/με ±0.1 测量精度/% 0.5 应变系数/ （pm·με） 0.8～1.2 线性度/% 99.9 重复性误差/% ≤0.5 中心波长/nm 1528～1568 反射率/% ≥90 标距尺寸/mm 60 工作温度范围/℃ −30～80 
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表 2 标定试验的荷载值为20 kN时的数据
Table 2. Data obtained at load of 20 kN in calibration test
轨枕块
编号枕内应变
平均值/με枕内应变-枕
上压力斜率
平均值/
（kN·με−1）枕内应变-枕
上压力截距
平均值/kN1# 3.7 5.03 0.61 2# 3.6 4.98 1.11 3# 3.9 4.90 0.73 4# 3.9 4.93 0.76 5# 3.9 4.78 0.50 6# 3.7 5.10 0.69 7# 3.6 5.28 0.10 8# 3.7 5.21 1.14
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表 3 有限元模型材料参数
Table 3. Material parameters of finite element model
部件 材料 弹性
模量/GPa泊松比 密度/
(kg·m−3)轨枕块 C60 混凝土 36.5 0.20 2640 道床板 C40 混凝土 32.5 0.24 2440 传感器 FRP 72.0 0.20
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