假缝对Ⅱ型轨道板上拱稳定性影响研究

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Abstract Research purposes: The upper arch of the type Ⅱ track slab is the main problem in the use of this type of track structure. At present, the formation mechanism of the upper arch on the track slab is not completely clear.In order to study the nature of the influence of the V-shaped groove in different working conditions on the upper arch stability of the track slab,based on the theory of structural stability, this paper establishes a three-dimensional numerical model of the upper arch stability of type Ⅱ track slabs that can fully characterize the shape and damage form of the V-shaped groove,and on the basis of fully considering the detailed and overall structural characteristics of type Ⅱ track slab, various calculation schemes and working conditions corresponding to different research contents have been drawn up; The numerical model established in this paper is used to calculate the vertical displacement of the track slab under the above various schemes and working conditions,by comparing the calculated vertical displacement of the track slab with the allowable vector of the upper arch on the track slab,the influence of the V-shaped groove under normal and damaged conditions on the stability of the track slab arch is analyzed, and a new groove scheme to improve the stability of upper arch on track slab is determined.
Research conclusions: (1) V-shaped groove are beneficial to maintaining the stability of the upper arch of the track slab. (2) V-shaped groove has little effect on the line shape of the upper arch deformation of the track slab. (3)Under the condition that the depth and opening width of the original V-shaped groove remain unchanged, when the "V" section is changed into a rectangular section,the upper arch of the track slab is reduced by about 11%.(4)The damage at the V-shaped groove is beneficial to the stability of the track slab. (5)The research results of this paper can provide a reference for further clarifying the formation mechanism of the upper arch on the track slab and reasonably formulating the maintenance method of ballastless track.

Key words： type Ⅱ track slab stability of upper arch V-shaped groove damage state numerical model

Received: 30 June 2021

PACS:

U213.7

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	YANG Junbin
	LIU Xueyi
	YANG Rongshan

Cite this article:

YANG Junbin,LIU Xueyi,YANG Rongshan. Research on the Influence of V-shaped Groove on the Upper Arch Stability of Type Ⅱ Track Slab[J]. Journal of Railway Engineering Society, 2022, 39(5): 26-32.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I5/26

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