重载铁路改良土和A组填料过渡段的动力特性

doi:10.13229/j.cnki.jdxbgxb20200648

Abstract

Abstract:

In order to analyze the dynamic features of the special transition section of different types of filling adjacent to fill, considering the background of Haoji (Haole Baoji-Jian) heavy-haul railway engineering, the method, combining the field excitation test and numerical simulation, was used to reveal the difference of dynamic features between transverse and longitudinal of the transition section subgrade between improved soil and group A filler. The results show that under the same load condition, the dynamic response of the cross section of the A-filled subgrade is greater than that of the modified expansive soil, which is specifically manifested by the increase of dynamic stress by 5~8% and acceleration by 40~50%. When the trains with a speed of 120 km/h and an axle load of 25~30 t, the dynamic response of the longitudinal road surface at the junction of the transition section increases by 0.8~13%, and to certain extent it is affected by the direction of the vehicle. The research results can provide a theoretical basis for the fine construction and maintenance of the filling transition section of heavy-haul railway.

Key words: highway & railway engineering, filling transition section, dynamic features, excitation test, numerical simulation

CLC Number:

U231.1

Yong-hui SHANG,Lin-rong XU,Wei-zheng LIU,Yu CAI. Dynamic features of transition section between improved soil and A⁃filled of heavy⁃haul railway[J].Journal of Jilin University(Engineering and Technology Edition), 2021, 51(6): 2128-2136.

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指标类别	指标参数	天然土样	水泥掺量
指标类别	指标参数	天然土样	3%	4%	5%
胀缩特性	自由膨胀率	66	32	28	23
	有荷膨胀率（25 kPa）	6.8	0.1	0.06	<0
	有荷膨胀率（50 kPa）	6.7	<0	<0	<0
	膨胀力/kPa	129	14	10	1
	收缩系数	0.91	0.73	0.62	0.52
	缩限/%	10.2	10.2	11.9	11.2
强度指标	黏聚力/kPa	45	183	201	291
	内摩擦角Φ	21.4	24.6	33.2	35.5
	7 d饱和无侧限抗压强度/kPa	44	866	1018	1170
水稳系数	压实度0.90	0.18	0.81	0.84	0.83
水稳系数	压实度0.95	0.25	0.85	0.88	0.89

相关指标	天然土样	掺量3%		掺量4%		掺量5%
相关指标	天然土样	石灰	水泥	石灰	水泥	石灰	水泥
自由膨胀率	66	27	30	24	27	21	23
有荷膨胀率（25 kPa）	6.8	<0	0.1	<0	0.06	<0	<0
有荷膨胀率（50 kPa）	6.7	<0	<0	<0	<0	<0	<0
膨胀力/kPa	129	12	14	5	10	1	1

相关指标	天然土样	掺量3%		掺量4%		掺量5%
相关指标	天然土样	石灰	水泥	石灰	水泥	石灰	水泥
饱和无侧限强度/kPa	37	308	335	477	512	786	852
黏聚力C	42	124	139	189	204	231	244
内摩擦角Φ	20.6	24.6	27.6	30.2	31.8	37.5	41.8

填料类别	围压/kPa	临界动应力/kPa
填料类别	围压/kPa	范围区间	平均值
3%水泥改良土	15	151.2~185.7	168.45
	30	157.5~203.5	180.50
	60	182.3~233.1	207.70
5%水泥改良土	15	142.5~208.1	175.30
	30	148.3~233.5	190.90
	60	202.5~249.7	226.10
A组粗粒填料^［20］	15	100~125	112.5
	30	100~125	112.5
	60	125~150	137.5

深度/m	静应力/kPa	轴重为30 t、速度为120 km/h
深度/m	静应力/kPa	动应力/kPa	动静应力比
0	17.7	116.29	6.57
0.6	30.0	72.23	2.41
0.9	35.4	48.56	1.38
2.5	64.2	28.03	0.44
3.5	82.2	17.52	0.21
4.5	100.2	12.89	0.13

Dynamic features of transition section between improved soil and A⁃filled of heavy⁃haul railway

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