路基水平变形对CRTSⅡ型板式无砟轨道静态变形的映射规律
殷威1倪婉昱2闫广鹏1
Mapping Law of CRTS Ⅱ Type Slab Ballastless Track Static Deformation Due to Subgrade Horizontal Deformation
YIN Wei1NI Wanyu2YAN Guangpeng1
-
作者信息:1.中国市政工程中南设计研究总院有限公司，430010，武汉
2.四川蜀道高速公路集团有限公司，610041，成都
-
Affiliation:1.Central & Southern China Municipal Engineering Design and Research Institute Co., Ltd., 430010, Wuhan, China
2.Sichuan Shudao Expressway Group Co., Ltd., 610041, Chengdu, China
-
关键词:
-
Key words:
-
DOI:10.16037/j.1007-869x.2024.07.030
-
中图分类号/CLCN:U216.417
-
栏目/Col:研究报告
摘要:
［目的］目前，高铁路基水平变形相关控制指标尚不完善，因此有必要对无砟轨道路基水平变形影响规律及限值进行研究。［方法］利用有限元方法，计算了不同波长和幅值的余弦型路基水平变形条件下，CRTSⅡ型板式无砟轨道的结构受力、变形及线路轨道不平顺值；参照轨道几何尺寸容许偏差管理值和无砟轨道结构拉应力容许值，研究了路基余弦型水平变形的传递规律及限值。［结果及结论］钢轨、轨道板、砂浆层、支承层等无砟轨道结构的水平变形对高铁路基余弦型水平变形存在显著的响应特征。当水平变形波长为20m、水平变形幅值为10mm时，路基余弦型水平变形对轨道轨向不平顺造成的影响最大，对轨道水平不平顺的影响次之，对轨距及高低不平顺指标的影响可忽略。当水平变形幅值为20mm时，随着水平变形波长的增大，钢轨水平变形最大值也有所增大，轨向不平顺、轨道板及支承层拉应力则先增大后减小。路基余弦型水平变形幅值的限值随着水平变形波长的增大而增大，二者满足二次函数关系。
Abstracts:
［Objective］ Aiming at the insufficient control indexes for high-speed railway subgrade horizontal deformation currently, it is necessary to study the influence law and limit values of ballastless track subgrade horizontal deformation. ［Method］ Using finite element method, the structural stress, deformation, and track irregularity of CRTS (China railway track system) II type ballastless track are calculated under horizontal deformation conditions of cosine-shaped subgrade with different wavelengths and amplitudes. Referring to the allowable tolerance values for track geometric dimensions and the allowable tensile stress values of ballastless track structure, the transmission law and limit values of subgrade cosine-shaped horizontal deformation are studied. ［Result & Conclusion］ The horizontal deformation of ballastless track structures such as rail, track slab, mortar layer and supporting layer shows significant response characteristics to cosine-shaped horizontal deformation of high-speed railway subgrade. When the wavelength and amplitude of horizontal deformation are 20 m and 10 mm respectively, the influence of subgrade cosine-shaped horizontal deformation on track alignment irregularity is the greatest, followed by the influence on track horizontal irregularity, while the influence on gauge and vertical irregularity indicators can be ignored. When the amplitude of horizontal deformation is 20 mm, as its wavelength increases, the maximum value of rail horizontal deformation increases, while the track irregularity, track slab and supporting layer tensile stresses first increase and then decrease. The limit value of subgrade cosine-shaped horizontal deformation amplitude increases with the increase of horizontal deformation wavelength, and the two satisfy a quadratic function relationship.
- 上一篇: 高铁物流运输模式及其可行性
- 下一篇: 动车组制动系统具有换代特征的技术进步
过刊浏览
资料下载
友情链接