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

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

Abstract

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

CLC Number:

U451.3

TANG Qianlong, PENG Limin, DENG E, et al. Safety of Existing Intersection High-Speed Railway Trains Under the Condition of Sheild Tunnel Penetration Construction Considering the Stochastic Field[J]. Journal of South China University of Technology(Natural Science Edition), 2024, 52(4): 95-103.

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土层类型	密度/（kg·m^-3）	弹性模量/MPa	泊松比	厚度/m
填充土层	1 650	6	0.23	3.0
粉土层	1 960	8	0.30	5.1
粉质黏土层	2 020	13	0.30	1.2
注浆加固区	2 060	45	0.23	9.9
砂砾卵石层	2 120	50	0.25	30.5

施工步	到既有高铁线路中心线的距离/m	隧道开挖状态
1	20	开始开挖
5	10	至既有线前方
11	0	既有线正下方
16	10	穿过既有线
33	44	隧道模型贯通

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