冻融及不同温度下石灰改良盐渍土动力参数研究

徐永丽; 董子建; 周吉森; 谭洪亮; 周舰航

doi:10.11779/CJGE202201008

冻融及不同温度下石灰改良盐渍土动力参数研究 English Version

1.
东北林业大学土木工程学院, 黑龙江哈尔滨 150000
2.
龙建路桥第六工程有限公司, 黑龙江哈尔滨 150000

基金项目:

黑龙江省龙建路桥股份有限公司科技项目 230000100004258210006

详细信息

作者简介:
徐永丽(1977—)，女，工学博士，教授，主要从事道路结构与材料研究工作。E-mail: xuyongli77@163.com

中图分类号: TU448;U416
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出版历程
- 收稿日期: 2021-06-10
- 网络出版日期: 2022-09-22
- 刊出日期: 2021-12-31

Dynamic parameters of lime-improved saline soil under freeze-thaw and different temperatures

1.
School of Civil Engineering, Northeast Forestry University, Harbin 150000, China
2.
Heilongjiang Long Jian Road and Bridge Sixth Limited Comany, Harbin 150000, China

摘要

摘要: 为研究季冻区石灰改良盐渍土路基稳定性，室内试验分析了冻融及低温环境下的动力参数变化规律。以哈肇公路沿线盐渍土为研究对象，采用英国GDS动三轴试验系统（GDSTAS），对不同动荷载频率、围压、温度及冻融循环次数下的石灰改良盐渍土动剪切模量和阻尼比进行试验测定，结果表明：转折点动剪切模量可以反映动剪切模量的变化趋势；温度降低、围压增加及频率增加条件下，动剪切模量增加且阻尼比减小，其中温度对动力参数影响更加显著；随着冻融循环次数增加，动剪切模量减小且阻尼比增加；提出温度修正系数和冻融修正系数，对动剪切模量和阻尼比进行修正并曲线拟合，拟合曲线显示修正系数转折点分别为-6℃处和3次冻融循环处。在此基础上提出动力参数预测模型，可为石灰改良盐渍土路基稳定性分析提供参考。
- 盐渍土 /
- 石灰改良 /
- 动剪切模量 /
- 阻尼比 /
- 低温 /
- 冻融循环
Abstract: In order to study the stability of lime-improved saline soil roadbed in seasonal freezing areas, laboratory tests are conducted to analyze the change of the dynamic parameters under freeze-thaw and low-temperature environments. The British GDS dynamic triaxial test system (GDSTAS) is adopted to measure the dynamic shear modulus and damping ratio of lime-improved saline soil under different dynamic load frequencies, confining pressures, temperatures and numbers of freeze-thaw cycles. The results show that the dynamic shear modulus at the turning point can reflect the changing trend of the dynamic shear modulus of the sample. The decrease in temperature, the increase in frequency and the increase in confining pressure can increase the dynamic shear modulus and decrease the damping ratio of the sample. The temperature has a more significant impact on the dynamic characteristics. When the number of freeze-thaw cycles increases, the dynamic shear modulus and the damping ratio increase. The temperature correction coefficient and freeze-thaw correction coefficient are proposed to correct the dynamic shear modulus and damping ratio, and the curve fitting is performed. The fitting curve shows that the turning points of the correction coefficient are at -6℃ and the three freeze-thaw cycles respectively. On this basis, a dynamic parameter prediction model is proposed as reference for the stability design of lime-improved saline soil roadbed.
- saline soil /
- lime improvement /
- dynamic shear modulus /
- damping ratio /
- low temperature /
- freeze-thaw cycle

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图 1 试验用土颗粒级配曲线

Figure 1. Grain-size distribution curves of test specimens

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图 2 正弦形式轴向动荷载示意图

Figure 2. Schematic diagram of sinusoidal axial dynamic load

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图 3 不同频率下动剪切模量及阻尼比拟合曲线

Figure 3. Fitting curves of dynamic shear modulus and damping ratio at different frequencies

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图 4 不同围压下动剪切模量及阻尼比拟合曲线

Figure 4. Fitting curves of dynamic shear modulus and damping ratio under different confining pressures

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图 5 不同温度下动剪切模量及阻尼比拟合曲线

Figure 5. Fitting curves of dynamic shear modulus and damping ratio under different temperatures

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图 6 动剪切模量和阻尼比温度修正系数拟合曲线

Figure 6. Fitting curves of temperature correction coefficient for dynamic shear modulus and damping ratio

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图 7 不同冻融循环次数下动剪切模量及阻尼比拟合曲线

Figure 7. Fitting curves of dynamic shear modulus and damping ratio under different freeze-thaw cycles

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图 8 动剪切模量和阻尼比冻融修正系数拟合曲线

Figure 8. Fitting curves of freeze-thaw correction coefficient for dynamic shear modulus and damping ratio

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表 1 盐渍土离子含量测定值

Table 1 Measured values of ion content of saline soil (%)

阳离子					阴离子
K⁺	Na⁺	Ca²⁺	Mg²⁺	总量	CO₃^2-	HCO₃^-	SO₄^2-	Cl^-	总量
0.21	0.2173	0.0244	0.0357	0.4870	0.2205	0.1086	0.0622	0.1134	0.5047

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表 2 试验方案

Table 2 Test plan

试验编号	试验温度 /℃	频率/Hz	有效围压 /kPa	冻融循环次数
S1	20	1	100	0
S2~S3	20	3，5	100	0
S4~S6	20	1	50，100，150	0
S7~S13	0，-2，-4，-6， -8，-10，-16	1	100	0
S14~S18	20	1	100	1，3，5，7，9

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表 3 不同频率及围压下动剪切模量及阻尼比的拟合参数

Table 3 Fitting parameters of dynamic shear modulus and damping ratio under different frequencies and confining pressures

频率/Hz	动剪切模量G_d			阻尼比 $\lambda$
频率/Hz	a	b	R²	${\lambda _{\max }}$	c	n	R²
1	0.0101	4.7873	0.9865	0.46	0.0025	0.6845	0.9183
3	0.0076	3.4389	0.9886	0.39	0.0096	0.3665	0.9893
5	0.0056	3.3365	0.9887	0.36	0.0169	0.3469	0.9950

围压/kPa	动剪切模量G_d			阻尼比λ
围压/kPa	a	b	R²	λ_max	c	n	R²
50	0.0145	4.7686	0.9942	0.55	0.0036	0.4693	0.9940
100	0.0101	4.7873	0.9865	0.46	0.0025	0.6845	0.9183
150	0.0080	3.4256	0.9941	0.43	0.1306	0.2455	0.9802

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表 4 不同频率及围压下最大动剪切模量及阻尼比

Table 4 Maximum dynamic shear modulus and damping ratios under different frequencies and confining pressures

参数	频率/Hz			围压/kPa
参数	1	3	5	50	100	150
G_dmax/MPa	98.81	130.89	177.31	69.11	98.81	125.31
λ_max	0.46	0.39	0.36	0.55	0.46	0.42

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表 5 不同温度下动剪切模量及阻尼比的拟合参数

Table 5 Fitting parameters of dynamic shear modulus and damping ratio under different temperatures

温度/℃	动剪切模量G_d			阻尼比 $\lambda$
温度/℃	a	b	R²	${\lambda _{\max }}$	c	n	R²
20	0.0101	4.7873	0.9865	0.4546	0.0025	0.6845	0.9183
0	0.0073	4.1682	0.9965	0.3928	0.0018	0.5971	0.9384
-2	0.0041	3.2572	0.9728	0.3718	0.0016	0.6851	0.9707
-4	0.0031	2.7513	0.9908	0.2818	0.0015	0.6153	0.9330
-6	0.0028	2.5054	0.9989	0.2170	0.0013	0.5750	0.9742
-8	0.0024	2.5351	0.9966	0.1915	0.0010	0.6831	0.9409
-10	0.0024	2.1925	0.9811	0.1441	0.0008	0.5857	0.9024
-16	0.0024	1.7242	0.9247	0.0700	0.0006	0.4172	0.9567

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表 6 不同温度下最大动剪切模量及阻尼比

Table 6 Maximum dynamic shear modulus and damping ratios under different temperatures

温度/℃	G_dmax/MPa	${\lambda _{\rm{max}}}$
20	98.81	0.46
0	137.17	0.39
-2	242.13	0.37
-4	320.51	0.28
-6	357.14	0.22
-8	413.22	0.19
-10	414.94	0.14
-16	423.73	0.07

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表 7 温度修正系数的拟合参数

Table 7 Fitting parameters of temperature correction coefficient

A₁	A₂	T₀	r₁	A₀	y₀	r₂
2.76	-0.29	-0.76	2.26	-4.32	4.48	-3.12

${\alpha _1}$	${\alpha _2}$	R²	${y'_0}$	${A'_0}$	${r'_2}$	R²
0.53	0.66	0.991	-0.019	0.91	11.42	0.990

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表 8 不同冻融循环次数动剪切模量及阻尼比的拟合参数

Table 8 Fitting parameters of dynamic shear modulus and damping ratio under different freeze-thaw cycles

冻融循环次数	动剪切模量G_d			阻尼比λ
冻融循环次数	a₂	b₂	R²	${\lambda _{\rm{max}}}$	c₂	n₂	R²
0	0.0102	4.7873	0.9865	0.4649	0.0025	0.6972	0.8884
1	0.0145	6.1150	0.9960	0.5675	0.0040	0.7006	0.9551
3	0.0214	6.1155	0.9984	0.6641	0.0049	0.6692	0.9631
5	0.0227	6.9325	0.9951	0.6827	0.0061	0.7094	0.9558
7	0.0262	7.8786	0.9953	0.7022	0.0075	0.7610	0.9514
9	0.0283	7.6030	0.9983	0.7124	0.0085	1.0048	0.9741

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表 9 不同冻融循环次数下最大动剪切模量及阻尼比

Table 9 Maximum dynamic shear modulus and damping ratios under different freeze-thaw cycles

冻融循环次数	G_dmax/MPa	${\lambda _{\rm{max}}}$

0	98.81	0.47
1	70.08	0.57
3	46.53	0.66
5	43.80	0.68
7	39.26	0.70
9	35.65	0.71

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表 10 冻融循环修正系数的拟合参数

Table 10 Fitting parameters of freeze-thaw cycle correction coefficient

${a_3}$	${b_3}$	${c_3}$	${R^2}$
0.56	1.87	0.38	0.991

${a_4}$	${b_4}$	${c_4}$	${R^2}$
1.53	-0.50	0.65	0.980

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