非饱和膨胀岩饱和度及胀缩特性试验研究

doi:10.13722/j.cnki.jrme.2019.0579

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Abstract The engineering disasters caused by deformation and failure of expansive rocks occur frequently，and disaster-inducing mechanisms need to be further studied. In the present study，through indoor swelling and shrinkage tests and combined with the suction theory，the saturation and swelling-shrinkage characteristics of unsaturated and undisturbed strong expansive rock in Nanning were studied. The swelling rate tests were performed in both cases of different initial moisture contents without vertical load and different vertical loads，and the shrinkage tests were carried out under the condition that the samples are sufficiently saturated and naturally dried. The research results indicate that，during the process of water absorption and swelling of the unsaturated expansive rock，both the saturation and the swelling rate show three-stage growth for two cases of no vertical load and the vertical load less than the expansive force，that the relationships between the saturation and the swelling rate of the two cases are respectively exponential and non-linear，and that the variation of the swelling rate lags behind that of the saturation，i.e.，the expansive rock reaches saturation state first. When the vertical load is equal to the expansive force，the expansive rock absorbs water and reaches saturation state without volume variation. The variation tendency of the saturation of the expansive rock is influenced by the initial water content at the initial stage of water absorption，especially near the shrinkage limit，but the saturation after swelling stabilization is insensitive to the vertical load. It is also shown that，during the shrinkage process of initial saturated expansive rock，the saturation develops in a three-stage attenuation mode and there is a negative correlation between the saturation and the linear shrinkage. For unsaturated expansive rocks in Nanning area，the saturation changes while the swelling-shrinkage deformation almost keeps constant when the saturation is in the range of 80% and 90%. The corresponding research results can provide a scientific basis for reasonable construction of swelling-shrinkage constitutive model of expansive rocks and a guide for the evaluation of the stability of unsaturated expansive rock engineering.

Key words： rock mechanics unsaturated expansive rock expansion and shrinkage characteristics saturation indoor experiment

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	Articles by authors
	FAN Qiuyan1
	LIANG Xin2
	HAN Jinshi1

Cite this article:

FAN Qiuyan1,LIANG Xin2,HAN Jinshi1. #br# Experimental study on saturation and swelling-shrinkage characteristics of unsaturated expansive rocks#br#[J]. , 2020, 39(1): 45-56.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2019.0579 OR http://www.rockmech.org/EN/Y2020/V39/I1/45

[17]	黄绍铿. 一种以吸力解释膨胀土力学特性的尝试[J]. 土工基础，1992，6(2)：1-6.(HUANG Shaokeng. An attempt to explain the mechanical characteristics of swelling soil by suction[J]. Soil Engineering and Foundation，1992，6(2)：1-6.(in Chinese))
[12]	谭罗荣，孔令伟. 膨胀土膨胀特性的变化规律研究[J]. 岩土力学，2004，25(10)：1 555-1 559.(TAN Luorong，KONG Lingwei. Study on variation regularity of swelling behavior of expansive soil[J]. Rock and Soil Mechanics，2004，25(10)：1 555-1 559.(in Chinese))
[4]	CHERTKOV V Y. Physical modeling of the soil swelling curve vs. the shrinkage curve[J]. Advances in Water Resources，2012，44：66-84.
[14]	包承纲. 非饱和土的性状及膨胀土边坡稳定问题[J]. 岩土工程学报，2004，26(1)：1-15.(BAO Chenggang. Behavior of unsaturated soil and stability of expansive soil slope[J]. Chinese Journal of Geotechnical Engineering，2004，26(1)：1-15.(in Chinese))
[16]	FREDLUND D G，RAHARDJOH. Soil mechanics for unsaturated soils[M]. [S. l.]：John Wiley and Sons，1993：64-66.
[1]	范秋雁. 膨胀岩与工程[M]. 北京：科学出版社，2008：1-2.(FAN Qiuyan. Swelling rock and Engineering[M]. Beijing：Science Press，2008：1-2.(in Chinese))
[5]	谬林昌，仲晓晨，殷宗泽. 非饱和膨胀土变形规律的试验研究[J]. 大坝观测与土工测试，1999，23(3)：36-39.(LIAO Linchang，ZHONG Xiaochen，YIN Zongze. Test research of unsaturated expansive oil strain laws[J]. Dam Observation and Geotechnical Tests，1999，23(3)：36-39.(in Chinese))
[7]	刘静德，李青云，龚壁卫. 南水北调中线膨胀岩膨胀特性研究[J]. 岩土工程学报，2011，33(5)：826-830.(LIU Jingde，LI Qingyun，GONG Biwei. Swelling properties of expansive rock in middle route project of South-to-North Water Diversion[J]. Chinese Journal of Geotechnical Engineering，2011，33(5)：826-830.(in Chinese))
[9]	张亚男，季昌，周顺华，等. 卵砾石下伏中等膨胀岩地层土压平衡盾构姿态演化规律[J]. 工程地质学报，2016，24(5)：798-805.(ZHANG Yanan，JI Chang，ZHOU Shunhua，et al. Evolution of earth pressure balance shield attitude in medium expensive rock underlining gravel-cobble layer[J]. Journal of Engineering Geology，2016，24(5)：798-805.(in Chinese))
[11]	温春莲，陈新万. 初始含水率、容重及载荷对膨胀岩特性影响的试验研究[J]. 岩石力学与工程学报，1992，11(3)：304-311.(WEN Chunlian，CHEN Xinwan. Effects of initial water content，dry unit weight and load on the swelling of clayey weak rock：an experimental study[J]. Chinese Journal of Rock Mechanics and Engineering，1992，11(3)：304-311.(in Chinese))
[2]	唐迎春，黄钟晖，张凯，等. 南宁第三系浅表层风化泥岩物理力学及膨胀特性指标分析[J]. 工程地质学报，2014，22(1)：144-151.(TANG Yingchun，HUANG Zhonghui，ZHANG Kai，et al. Physical mechanical indexes and swelling property of weathered tertiary mudstone at shallow depth in Nanning[J]. Journal of Engineering Geology，2014，22(1)：144-151.(in Chinese))
[3]	TARIQ A R，DURNFORD D S. Analytical volume change model for swelling clay soils[J]. Soil Science Society of America Journal，1993，57(5)：1 183-1 187.
[10]	欧孝夺，唐迎春，钟子文，等. 重塑膨胀岩土微变形条件下膨胀力试验研究[J]. .岩石力学与工程学报，2013，32(5)：1 067-1 072.(OU Xiaoduo，TANG Yingchun，ZHONG Ziwen，et al. Test research on expansive force under small deformation of remolded expansive rock and soil[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(5)：1 067-1 072.(in Chinese))
[13]	俞培基，陈愈炯. 非饱和土的水-气形态及其与力学性质的关系[J]. 水利学报，1965(1)：18-26.(YU Peiji，CHEN Yutong. The pore air-water configurations and their effects on the mechanical properties of partially saturated soils[J]. Journal of Hydraulic Engineering，1965(1)：18-26.(in Chinese))
[15]	中华人民共和国国家标准编写组. GB/T50123—1999土工试验方法标准[S]. 北京：中国计划出版社，1999.(The National Standards Compilation Group of the People¢s Republic of China. GB/T50123—1999 Standard for soil test method[S]. Beijing：China Planning Press，1999.(in Chinese))
[19]	栾茂田，汪东林，杨庆，等. 非饱和重塑土的干燥收缩试验研究[J]. 岩土工程学报，2008，30(1)：118-122.(LUAN Maotian，WANG Donglin，YANG Qing，et al. Experimental study on drying shrinkage of unsaturated compacted soil[J]. Chinese Journal of Geotechnical Engineering，2008，30(1)：118-122.(in Chinese))
[20]	WHITE D J，TAKE W A，BOLTON M D. Soil deformation measurement using particle image velocimetry (PIV) and photogrammetry[J]. Géotechnique，2003，53(7)：619-632.
[6]	杨庆，张慧珍，栾茂田. 非饱和膨胀土抗剪强度的试验研究[J]. 岩石力学与工程学报，2004，23(3)：420-425(YANG Qing，ZHANG Huizhen，LUAN Maotian. Testing study on shear strength of unsaturated expansive soils[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(3)：420-425.(in Chinese))
[8]	马少坤，赵乃峰，周东，等. 南宁膨胀土长期压缩特性研究[J]. 岩土力学，2013，34(8)：2 280-2 286.(MA Shaokun，ZHAO Naifeng，ZHOU Dong，et al. Characteristics study of long-term compressibility of Nanning expansive soil[J]. Rock and Soil Mechanics，2013，34(8)：2 280-2 286.(in Chinese))
[18]	范秋雁，柯尊敬，凌国志. 膨胀土中的吸力特性及量测问题探讨[J]. 路基工程，1995，(6)：36-39.(FAN Qiuyan，KE Zunjing，LING Guozhi. Study on suction characteristics and measurement of expansive soil[J]. Subgrade Engineering，1995，(6)：36-39.(in Chinese))
[21]	唐朝生，施斌，崔玉军. 土体干缩裂隙的形成发育过程及机理[J]. 岩土工程学报，2018，40(8)：1 415-1 423.(TANG Chaosheng，SHI Bin，CUI Yujun. Behaviors and mechanisms of desiccation cracking of soils[J]. Chinese Journal of Geotechnical Engineering，2018，40(8)：1 415-1 423.(in Chinese))