干湿、冻融循环对膨胀土土–水及收缩特征的影响

赵贵涛; 韩仲; 邹维列; 王协群

doi:10.11779/CJGE202106018

干湿、冻融循环对膨胀土土–水及收缩特征的影响 English Version

赵贵涛^1,,
韩仲^{1, 2, ,},
邹维列^{1, 2},
王协群³

1.
武汉大学土木建筑工程学院,湖北　武汉　430072
2.
武汉大学教育部水工岩石力学重点实验室,湖北　武汉　430072
3.
武汉理工大学土木工程与建筑学院,湖北　武汉　430070

基金项目:

国家自然科学基金项目 51779191

国家自然科学基金项目 51809199

详细信息

作者简介:
赵贵涛(1993—),男,博士研究生,主要从事特殊土土力学与非饱和土力学方面的研究工作。E-mail: zgt-aspirations@whu.edu.cn

通讯作者:
韩仲, E-mail: zhong.han@whu.edu.cn

中图分类号: TU43
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出版历程
- 收稿日期: 2020-08-31
- 网络出版日期: 2022-12-02
- 刊出日期: 2021-05-31

Influences of drying-wetting-freeze-thaw cycles on soil-water and shrinkage characteristics of expansive soil

ZHAO Gui-tao^1,,
HAN Zhong^{1, 2, ,},
ZOU Wei-lie^{1, 2},
WANG Xie-qun³

1.
School of Civil Engineering, Wuhan University, Wuhan 430072, China
2.
Key Laboratory of Hydraulic Rock Mechanics of Ministry of Education, Wuhan University, Wuhan 430072, China
3.
School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China

摘要

摘要: 研究了冻融循环、干湿循环和交替的干湿—冻融循环对压实膨胀土的微观结构、土–水特征曲线和收缩特征曲线的影响。试验结果表明：冻融、干湿以及干湿—冻融循环显著改变了压实膨胀土的大孔隙系统；干湿循环使压实土样的大孔隙消失,但产生可见的宏观裂隙；冻融循环导致土样产生肉眼不可见的微裂隙；干湿—冻融循环既产生可见的宏观裂缝,又产生不可见的微裂隙。宏观及微观裂隙的产生显著降低了膨胀土在低吸力范围内的持水能力以及从饱和状态到干燥状态的收缩量,但对高吸力范围内的持水能力和土样的缩限和塑限无显著影响；收缩特征曲线等比例收缩段和残余收缩段的斜率在冻融循环和交替的干湿—冻融循环后减小,但在干湿循环后基本保持不变；受3种循环作用后的试样的含水率–孔隙比–吸力关系分布在同一个土–水特征曲面上,该曲面可由本文所提的改进土–水特征曲面模型加以描述。
- 膨胀土 /
- 干湿—冻融循环 /
- 土–水特征曲线 /
- 收缩特征曲线 /
- 微观结构
Abstract: The effects of freeze-thaw (FT), drying-wetting (DW) and alternative drying-wetting-freeze-thaw (DWFT) cycles on the micro-structure, soil-water characteristic curve (SWCC) and soil shrinkage characteristic curve (SSCC) of a compacted expansive soil are investigated. The experimental results show that the three investigated cyclic treatments significantly change the macro-pore system of soil. The macro-pores formed during compaction disappear during DW cycles while visible cracks are introduced. FT cycles induce invisible micro-cracks, and macro- and micro-cracks are both discovered in DWFT specimens. Macro- and micro-cracks significantly reduce the water retention capacity of soil in the low suction range and the amount of shrinkage from saturated condition to oven dryness. They have no influences on the SWCC in the high suction range and the shrinkage limit and plastic limit of soil. The slope of the SSCC at the proportional and residual shrinkage stages decreases after FT and DWFT cycles but remains constant after DW cycles. The relationships among moisture content, void ratio and suction of soil after different FT, DW and DWFT cycles are distributed on a unique surface which can be reasonably described by the proposed modified model. This study is useful for understanding the hydro-mechanical behavior of expansive soil under the influences of environmental factors.
- expansive soil /
- drying-wetting-freeze-thaw cycle /
- soil-water characteristic curve /
- shrinkage curve /
- microstructure

HTML全文

图 1 土–水特征曲线和收缩特征曲线示意图

Figure 1. Typical SWCC and SSCC

下载: 全尺寸图片幻灯片

图 2 饱和后的未处理的试样及经历10次循环的试样

Figure 2. Saturated specimens before and after 10 cyclic treatments

下载: 全尺寸图片幻灯片

图 3 试样经历3种循环处理之后的压汞实验结果

Figure 3. MIP test results of specimens after 3 cyclic treatments

下载: 全尺寸图片幻灯片

图 4 未经历循环处理及经历10次循环处理试样的SEM图像

Figure 4. SEM images of untreated specimens and after 10 cyclic treatments

下载: 全尺寸图片幻灯片

图 5 3种循环后试样的收缩曲线

Figure 5. SSCCs of specimens after 3 cyclic treatments

下载: 全尺寸图片幻灯片

图 6 3种循环后试样的质量含水率土–水特征曲线

Figure 6. w-SWCC of specimens after 3 cyclic treatments

下载: 全尺寸图片幻灯片

图 7 3种循环后试样的饱和度土–水特征曲线

Figure 7. S_r-SWCC of specimens after 3 cyclic treatments

下载: 全尺寸图片幻灯片

图 8 黑龙江膨胀土的 $ϑ$ –s–e关系及其预测

Figure 8. $ϑ$ –s–e relationships and their predictions for test soil

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表 1 黑龙江膨胀土的基本物理性质指标及主要化学成分

Table 1 Basic index properties and main chemical components of expansive soil

相对质量密度G_s	液限w_L/%	塑限w_PL/%	塑性指数I_P	自由膨胀率/%	pH值	主要化学成分及质量分数/%
相对质量密度G_s	液限w_L/%	塑限w_PL/%	塑性指数I_P	自由膨胀率/%	pH值	SiO₂	Al₂O₃	Fe₂O₃	K₂O	CaO
2.68	42.84	22.40	20	67	8.2	60.48	18.53	6.63	3.05	4

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表 2 收缩曲线模型拟合参数

Table 2 Fitting parameters for SSCC

循环次数	冻融循环					干湿循环					干湿—冻融循环
循环次数	e_sat	e₀	α	ξ	ζ	e_sat	e₀	α	ξ	ζ	e_sat	e₀	α	ξ	ζ
0	0.74	0.32	2.99	1.54	0.83	0.74	0.32	2.99	1.54	0.83	0.74	0.32	2.99	1.54	0.83
1	0.77	0.43	0.55	0.26	2.10	0.74	0.38	0.84	0.55	1.38	0.74	0.38	0.94	0.62	1.23
4	0.75	0.47	0.46	0.30	1.89	0.71	0.41	0.53	0.31	1.75	0.74	0.42	0.90	0.72	1.13
6	0.76	0.49	0.60	0.56	1.38	0.69	0.44	0.47	0.27	1.76	0.73	0.45	0.60	0.49	1.36
10	0.74	0.49	0.63	0.60	1.38	0.69	0.43	0.39	0.16	2.20	0.74	0.46	0.56	0.44	1.45

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表 3 质量含水率土–水特征曲线拟合参数

Table 3 Fitting parameters for w-SWCC

循环次数	冻融循环				干湿循环				干湿—冻融循环
循环次数	a_w/kPa	n_w	m_w	w_sat/%	α_w/kPa	n_w	m_w	w_sat/%	α_w/kPa	n_w	m_w	w_sat/%
0	361	0.91	0.59	27.59	361	0.91	0.59	27.59	361	0.91	0.59	27.59
1	154	0.80	0.60	28.61	130	0.63	0.68	28.13	138	0.71	0.64	27.07
4	77	0.62	0.71	29.07	95	0.56	0.72	27.11	63	0.61	0.64	27.27
6	54	0.65	0.65	28.50	76	0.60	0.65	26.42	41	0.62	0.62	28.04
10	43	0.55	0.74	29.00	64	0.51	0.71	25.79	36	0.61	0.60	27.14

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表 4 饱和度土–水特征曲线拟合参数

Table 4 Fitting parameters for S_r-SWCC

循环次数	冻融循环			干湿循环			干湿—冻融循环
循环次数	a_s/kPa	n_s	m_s	a_s/kPa	n_s	m_s	a_s/kPa	n_s	m_s
0	2139	1.12	0.06	2139	1.16	0.13	2139	1.16	0.13
1	493	0.50	0.44	342	0.45	0.35	378	0.33	0.50
4	116	0.58	0.40	52	0.47	0.33	89	0.48	0.40
6	52	0.61	0.38	34	0.50	0.32	42	0.60	0.33
10	49	0.58	0.38	27	0.36	0.40	39	0.49	0.41

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