有砟客专路基结构参数的优化研究

doi:10.16183/j.cnki.jsjtu.2019.235

摘要/Abstract

摘要：

为了改善有砟铁路路基结构受力状况和降低维修费用，需要研究列车荷载作用下路基结构参数对路基动力响应的影响．采用正交试验设计分析了铁路路基结构动力响应与道床弹性模量、基床表层弹性模量、基床底层弹性模量、道床厚度、基床表层厚度、基床底层厚度以及地基弹性模量等各结构层参数的敏感性关系，并结合层次分析法和线性评价指标确定了有砟铁路路基结构的最优参数组合．结果表明：道床厚度是影响道床动应力、基床表层动应力以及基床表层振动加速度的主要因素；地基的弹性模量是影响轨枕竖向位移的主要因素；确定有砟轨道结构的力学最优参数组合为道床弹性模量250 MPa，基床表层弹性模量120 MPa，基床底层弹性模量115 MPa，道床厚度0.35 m，基床表层厚度1.1 m，基床底层厚度2.3 m，地基弹性模量70 MPa.

关键词: 有砟铁路, 动力响应, 正交试验, 层次分析法

Abstract:

In order to improve the force condition of ballasted railway subgrade structure and reduce maintenance cost, it is necessary to study the influence of subgrade structure parameters on subgrade dynamic response under train load. Orthogonal test was designed and used to analyze the sensitive relationship between dynamic response of railway subgrade structure and parameters of each structural layer, and the optimal parameter combination of subgrade structure of ballasted railway was determined by combining analytic hierarchy process (AHP) and linear evaluation index. The parameters include elastic modulus of ballast bed, elastic modulus of surface and bottom layer of subgrade bed, thickness of ballast bed, thickness of surface and bottom layer of subgrade bed, and elastic modulus of foundation. The results show that the thickness of track bed is the main factor that affects dynamic stress of ballast bed, dynamic stress and vibration acceleration of surface layer of subgrade bed. The elastic modulus of foundation is the main factor that affects the vertical displacement of the sleeper. The mechanical optimum parameter combination of ballast track structure parameters is determined as the elastic modulus ballast bed is 250 MPa, elastic moduli of surface and bottom layer of subgrade bed are 120 MPa and 115 MPa, the thickness of ballast bed is 0.35 m, the thickness of surface and bottom layer of subgrade bed are 1.1 m and 2.3 m, and the elastic modulus of foundation is 70 MPa.

Key words: ballasted railway, dynamic response, orthogonal experiment, analytic hierarchy process (AHP)

中图分类号:

U216.3

王威, 陆思逵, 杨成忠, 冯青松. 有砟客专路基结构参数的优化研究[J]. 上海交通大学学报, 2021, 55(1): 48-55.

WANG Wei, LU Sikui, YANG Chengzhong, FENG Qingsong. Optimization of Subgrade Structure Parameters of Ballasted Track Passenger Dedicated Line[J]. Journal of Shanghai Jiao Tong University, 2021, 55(1): 48-55.

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结构	E/MPa	μ	ρ/(kg·m^－3)	c/kPa	φ/(°)	λ
轨枕	30 000	0.17	2 400	－	－	0.06
道床	200	0.25	2 200	4	40	0.09
基床表层	190	0.27	2 140	40	30	0.08
基床底层	110	0.30	1 950	30	20	0.11
地基	67	0.33	1 860	42	12	0.08

水平	A/MPa	B/MPa	C/MPa	D/m	F/m	G/m	H/MPa
1	150	120	65	0.15	0.3	1.3	30
2	200	145	90	0.35	0.7	2.3	50
3	250	170	115	0.55	1.1	3.3	70

试验号	因素水平							评价指标
试验号	A	B	C	D	F	G	H	s_max/mm	σ_1max/kPa	σ_2max/kPa	a_max/(m·s^－2)
1	1	1	1	1	1	1	1	1.72	205.70	116.06	8.08
2	1	2	2	2	2	2	2	1.38	201.65	67.97	7.77
3	1	3	3	3	3	3	3	1.24	187.59	57.32	2.70
4	2	1	1	2	2	3	3	1.25	185.02	62.47	7.85
5	2	2	2	3	3	1	1	1.54	214.79	53.56	4.55
6	2	3	3	1	1	2	2	1.32	207.42	121.10	6.87
7	3	1	2	1	3	2	3	1.08	190.99	108.68	7.89
8	3	2	3	2	1	3	1	1.48	189.30	58.07	7.17
9	3	3	1	3	2	1	2	1.30	213.88	53.34	4.26
10	1	1	3	3	2	2	1	1.42	217.42	54.00	5.38
11	1	2	1	1	3	3	2	1.36	222.11	125.66	7.16
12	1	3	2	2	1	1	3	1.28	185.56	66.68	7.76
13	2	1	2	3	1	3	2	1.30	211.25	54.88	5.02
14	2	2	3	1	2	1	3	1.12	200.93	114.68	7.35
15	2	3	1	2	3	2	1	1.52	194.85	59.59	6.35
16	3	1	3	2	3	1	2	1.15	185.62	61.60	7.28
17	3	2	1	3	1	2	3	1.19	204.69	51.26	4.15
18	3	3	2	1	2	3	1	1.55	213.29	124.94	12.34

因素	A	B	C	D	F	G	H
K₁₁	1.40	1.32	1.39	1.36	1.38	1.35	1.54
K₁₂	1.34	1.35	1.36	1.34	1.34	1.32	1.30
K₁₃	1.29	1.37	1.29	1.33	1.32	1.36	1.19
极差	0.11	0.05	0.10	0.03	0.06	0.04	0.35
最优水平	A3	B1	C3	D3	F3	G2	H3
主次顺序	H>A>C>F>B>G>D

因素	A	B	C	D	F	G	H
K₂₁	203.34	199.33	204.38	206.74	200.65	201.08	205.89
K₂₂	202.38	205.58	202.92	190.33	205.36	202.84	206.99
K₂₃	199.63	200.43	198.05	208.27	199.32	201.43	192.46
极差	3.71	6.25	6.33	17.94	6.03	1.76	14.53
最优水平	A3	B1	C3	D2	F3	G1	H3
主次顺序	D>H>C>B>F>A >G