考虑随机场的盾构下穿条件下既有高铁交会行车安全性

唐钱龙, 彭立敏, 邓锷, 等

doi:10.12141/j.issn.1000-565X.230062

华南理工大学学报(自然科学版) >

2024 , Vol. 52 >Issue 4: 95 - 103

DOI: https://doi.org/10.12141/j.issn.1000-565X.230062

交通安全

考虑随机场的盾构下穿条件下既有高铁交会行车安全性

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^1.中南大学土木工程学院, 湖南长沙 410075
^2.江西交通职业技术学院, 江西南昌 330013
^3.香港理工大学国家轨道交通电气化与自动化工程技术研究中心(香港分中心)/土木及环境工程学系, 香港 999077
^4.东华理工大学土木与建筑工程学院, 江西南昌 330013

唐钱龙（1980-），男，博士生，副教授，主要从事隧道与地下空间研究。E-mail:174801039@csu.edu.cn

收稿日期: 2023-02-22

网络出版日期: 2023-07-13

基金资助

国家自然科学基金资助项目(52308419);江西省教育厅科学技术研究项目(GJJ204611)

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Safety of Existing Intersection High-Speed Railway Trains Under the Condition of Sheild Tunnel Penetration Construction Considering the Stochastic Field

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^1.School of Civil Engineering，Central South University，Changsha 410075，Hunan，China
^2.Jiangxi Vocational and Technical College of Communications，Nanchang 330013，Jiangxi，China
^3.National Rail Transit Electrification and Automation Engineering Technology Research Center （Hong Kong Branch）/ Department of Civil and Environmental Engineering，The Hong Kong Polytechnic University，Hong Kong 999077，China
^4.School of Civil and Architectural Engineering，East China University of Technology，Nanchang 330013，Jiangxi，China

唐钱龙（1980-），男，博士生，副教授，主要从事隧道与地下空间研究。E-mail:174801039@csu.edu.cn

Received date: 2023-02-22

Online published: 2023-07-13

Supported by

the National Natural Science Foundation of China(52308419);the Science and Technology Research Program of Education Department of Jiangxi Province(GJJ204611)

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摘要

针对路基段高铁行车安全分析常将地基土视作具有确定性参数的介质的问题，文中基于随机场理论，将地基土视为具有纵向一致性的三维介质，建立了盾构下穿既有高铁的数值模型，并基于数论选点方法模拟地基土横截面的参数随机性。为更进一步研究盾构下穿高速铁路对高铁行车安全性的影响，文中建立了31自由度的高铁列车模型，结合Fluent 3D流体仿真软件和动网格技术，获得了高速列车的气动荷载时程曲线。基于概率密度演化理论分析了高铁列车以300、350和400 km/h的速度交会时的脱轨系数及其概率密度演化信息。结果表明：随机场的存在使得车辆的轮重减载率和脱轨系数具有一定的概率分布范围；在气动荷载和隧道下穿引起的既有高铁线路基变形影响下，垂向轮轨力曲线有明显的波动情况；轮重减载率最大值出现在地表沉降最大值两侧的下降段；垂向气动荷载大于横向气动荷载；随着车速的增加，轮重减载率及脱轨系数的各上限均在逐渐增大，为保证高铁交会行车的安全性，建议在盾构下穿既有线地段的高铁列车运行速度应不超过300 km/h。

关键词： 行车安全性; 概率密度演化理论; 随机场; 地基土; 隧道

本文引用格式

唐钱龙, 彭立敏, 邓锷, 等 . 考虑随机场的盾构下穿条件下既有高铁交会行车安全性[J]. 华南理工大学学报(自然科学版), 2024 , 52(4) : 95 -103 . DOI: 10.12141/j.issn.1000-565X.230062

Abstract

In view of the problem that the subgrade soil is often regarded as a medium with deterministic parameters in the traffic safety analysis of high-speed railway in subgrade section. In this paper, based on the stochastic field theory, subgrade soil was regarded as a three-dimensional medium with longitudinal uniformity, and a numerical model was established for a shield tunnel penetrating below an existing high-speed railway line. The parameter randomness of the subgrade soil cross section was simulated based on the number theory point selection method. In order to further explore the impact of a penetration shield tunnel on the safety of the existing high-speed railway, a 31-DOF vehicle model was established in this paper. Combined with the Fluent 3D fluid simulation software and dynamic grid technology, the aerodynamic load time history curve of high-speed train was obtained, and the derailment coefficient and probability density evolution information of trains at speeds of 300, 350 and 400 km/h were analyzed based on the probability density evolution theory. The results show that the existence of stochastic field makes the wheel weight reduction rate and derailment coefficient present a certain probability distribution range. The vertical wheel-rail force curve fluctuates obviously under the influence of the aerodynamic load and the subgrade deformation caused by the tunnel penetration. The maximum load reduction rate of wheel weight appears in the descending section on both sides of the maximum surface settlement. The vertical aerodynamic load is greater than the transverse aerodynamic load. With the increase of vehicle speed, the upper limits of wheel weight reduction rate and derailment coefficient are gradually increasing. In order to ensure the safety of intersecting trains, it is recommended that the running speed of high-speed trains under the shield tunneling should not exceed 300 km/h.

Key words： running safety; probability density evolution theory; stochastic field; foundation soil; tunnel

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