[1]刘顺青,王永璐,蔡国军,等.干湿循环和吸力对非饱和下蜀土力学特性影响的试验研究[J].东南大学学报(自然科学版),2021,51(3):473-479.[doi:10.3969/j.issn.1001-0505.2021.03.016]
 Liu Shunqing,Wang Yonglu,Cai Guojun,et al.Experimental study on the effects of wet-dry cycles and suction on the mechanical properties of unsaturated Xiashu loess[J].Journal of Southeast University (Natural Science Edition),2021,51(3):473-479.[doi:10.3969/j.issn.1001-0505.2021.03.016]
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干湿循环和吸力对非饱和下蜀土力学特性影响的试验研究()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
51
期数:
2021年第3期
页码:
473-479
栏目:
土木工程
出版日期:
2021-05-20

文章信息/Info

Title:
Experimental study on the effects of wet-dry cycles and suction on the mechanical properties of unsaturated Xiashu loess
作者:
刘顺青12王永璐2蔡国军1姜朋明2王杰2张梦2
1东南大学交通学院, 南京 211189; 2江苏科技大学土木工程与建筑学院, 镇江 212005
Author(s):
Liu Shunqing12 Wang Yonglu2 Cai Guojun1 Jiang Pengming2 Wang Jie2 Zhang Meng2
1School of Transportation, Southeast University, Nanjing 211189, China
2School of Architecture and Civil Engineering, Jiangsu University of Science and Technology, Zhenjiang 212005, China
关键词:
下蜀土 干湿循环 吸力 非饱和直剪试验 抗剪强度
Keywords:
Xiashu loess wet-dry cycle suction unsaturated direct shear test shear strength
分类号:
TU41
DOI:
10.3969/j.issn.1001-0505.2021.03.016
摘要:
为研究干湿循环和吸力共同作用对非饱和下蜀土力学特性的影响,选取镇江某边坡的下蜀土为研究对象,通过非饱和直剪试验,对不同干湿循环次数及吸力水平下下蜀土力学特性的变化规律进行了研究.结果表明:随着干湿循环次数的增加,下蜀土表面裂隙明显增加并具有不可逆性;下蜀土的抗剪强度经短暂增大后逐渐降低,并在第4次干湿循环作用后趋于稳定;下蜀土的黏聚力在经历短暂提高后逐渐降低并趋于稳定,而其内摩擦角则随干湿循环次数的增加变化幅度较小,呈上下波动态势;相同干湿循环次数下,吸力的存在对于下蜀土的黏聚力具有提升作用,而对土体内摩擦角的影响则不明显.研究结果可为干湿循环作用下下蜀土边坡的稳定性分析提供计算参数,具有实际工程意义.
Abstract:
To study the effect of wet-dry cycles and suction on the mechanical properties of unsaturated Xiashu loess, Xiashu loess of a slope in Zhenjiang City was selected as the research soil, the mechanical properties of unsaturated Xiashu loess under different wet-dry cycles and suction conditions were studied by unsaturated direct shear tests. The results show that the fissures on the surface of Xiashu loess increase obviously and are irreversible with the increase of the number of wet-dry cycles, and the shear strength of Xiashu loess decreases after a short period of increase and tends to be stable after the 4th wet-dry cycle. The cohesion of the Xiashu loess gradually reduces and stabilizes after a brief increase, and the internal friction angle of soil mass fluctuates up and down with the increase of wet-dry cycles. Under the same number of wet-dry cycles, the existence of suction can improve the cohesion of Xiashu loess, but its influence on the internal friction angle is not obvious. The research results provide calculation parameters for the stability analysis of Xiashu loess slopes during wet-dry cycles, and thus they have practical engineering significance.

参考文献/References:

[1] Lu H J,Li J X,Wang W W,et al.Cracking and water seepage of Xiashu loess used as landfill cover under wetting-drying cycles[J].Environmental Earth Sciences,2015,74(11):7441-7450.DOI:10.1007/s12665-015-4729-4.
[2] 许鹏,宋双双,刘宝生,等.南京下蜀土滑坡灾变成因现场调查及加固处理措施[J].地质调查与研究,2018,41(2):145-152.DOI:10.3969/j.issn.1672-4135.2018.02.011.
Xu P,Song S S,Liu B S,et al.Field investigation and reinforcement treatment measures of typical Xiashu soil landslide[J].Geological Survey and Research,2018,41(2):145-152.DOI:10.3969/j.issn.1672-4135.2018.02.011. (in Chinese)
[3] 韩爱民,李彤,章磊,等.南京下蜀土水敏性特征的试验研究[J].南京工业大学学报(自然科学版),2015,37(6):81-86.DOI:10.3969/j.issn.1671-7627.2015.06.015.
Han A M,Li T,Zhang L,et al.Experimental study on water sensitivity characteristics of Nanjing Xiashu Loess[J].Journal of Nanjing University of Technology(Natural Science Edition),2015,37(6):81-86.DOI:10.3969/j.issn.1671-7627.2015.06.015. (in Chinese)
[4] 刘顺青,胡海涛,蔡国军,等.干湿循环对有无上覆荷载作用镇江下蜀土抗剪强度的影响[J].工业建筑,2019,49(4):114-120.DOI:10.13204/j.gyjz201904019.
Liu S Q,Hu H T,Cai G J,et al.Shear strength degradation of Zhenjiang Xiashu soil during wetting drying cycles whether or not to be acted on by overburden load[J].Industrial Construction,2019,49(4):114-120.DOI:10.13204/j.gyjz201904019. (in Chinese)
[5] 詹良通,吴宏伟.吸力对非饱和膨胀土抗剪强度及剪胀特性的影响[J].岩土工程学报,2007,29(1):82-87.DOI:10.3321/j.issn:1000-4548.2007.01.013.
Zhan L T,Charles W W N G.Effect of suction on shear strength and dilatancy of an unsaturated expansive clay[J].Chinese Journal of Geotechnical Engineering,2007,29(1):82-87.DOI:10.3321/j.issn:1000-4548.2007.01.013. (in Chinese)
[6] Gan J K M,Fredlund D G,Rahardjo H.Determination of the shear strength parameters of an unsaturated soil using the direct shear test[J].Canadian Geotechnical Journal,1988,25(3):500-510.DOI:10.1139/t88-055.
[7] Fredlund D G,Xing A Q,Fredlund M D,et al.The relationship of the unsaturated soil shear strength to the soil-water characteristic curve[J].Canadian Geotechnical Journal,1996,33(3):440-448.DOI:10.1139/t96-065.
[8] 吴珺华,杨松.干湿循环下膨胀土基质吸力测定及其对抗剪强度影响试验研究[J].岩土力学,2017,38(3):678-684.DOI:10.16285/j.rsm.2017.03.009.
Wu J H,Yang S.Experimental study of matric suction measurement and its impact on shear strength under drying-wetting cycles for expansive soils [J].Rock and Soil Mechanics,2017,38(3):678-684.DOI:10.16285/j.rsm.2017.03.009. (in Chinese)
[9] Xiao J,Yang H P,Zhang J H,et al.Properties of drained shear strength of expansive soil considering low stresses and its influencing factors[J].International Journal of Civil Engineering,2018,16(10):1389-1398.DOI:10.1007/s40999-017-0268-6.
[10] 刘宽,叶万军,高海军,等.干湿环境下膨胀土力学性能劣化的多尺度效应[J].岩石力学与工程学报,2020,39(10):2148-2159.DOI:10.13722/j.cnki.jrme.2020.0170.
Liu K,Ye W J,Gao H J,et al.Multi-scale effects of mechanical property degradation of expansive soils under drying-wetting environments[J].Chinese Journal of Rock Mechanics and Engineering,2020,39(10):2148-2159.DOI:10.13722/j.cnki.jrme.2020.0170. (in Chinese)
[11] Dong J G,Xu G Y,Lv H B,et al.An instrument for wetting-drying cycle of expansive soil under simulated loads and experimental research [J].Journal of Engineering Research,2019,7(3):1-12.
[12] Ma T T,Wei C F,Yao C Q,et al.Microstructural evolution of expansive clay during drying-wetting cycle[J].Acta Geotechnica,2020,15(8):2355-2366.DOI:10.1007/s11440-020-00938-4.
[13] Zhao N F,Ye W M,Chen B,et al.Modeling of the swelling-shrinkage behavior of expansive clays during wetting-drying cycles[J].Acta Geotechnica,2019,14(5):1325-1335.DOI:10.1007/s11440-018-0718-6.
[14] Rosenbalm D,Zapata C E.Effect of wetting and drying cycles on the behavior of compacted expansive soils[J].Journal of Materials in Civil Engineering,2017,29(1):04016191.DOI:10.1061/(asce)mt.1943-5533.0001689.
[15] 中华人民共和国住房与城乡建设部.土工试验方法标准:GB/T 50123—2019[S]北京:中国计划出版社,2019.
[16] 中华人民共和国住房和城乡建设部.膨胀土地区建筑技术规范:GB 50112—2013[S].北京:中国建筑工业出版社,2013.
[17] 涂义亮,刘新荣,钟祖良,等.干湿循环下粉质黏土强度及变形特性试验研究[J].岩土力学,2017,38(12):3581-3589.DOI:10.16285/j.rsm.2017.12.024.
Tu Y L,Liu X R,Zhong Z L,et al.Experimental study on strength and deformation characteristics of silty clay during wetting-drying cycles [J].Rock and Soil Mechanics,2017,38(12):3581-3589.DOI:10.16285/j.rsm.2017.12.024. (in Chinese)

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备注/Memo

备注/Memo:
收稿日期: 2020-09-23.
作者简介: 刘顺青(1985—),男,博士;蔡国军(联系人),男,博士,教授,博士生导师,focuscai@163.com.
基金项目: 国家自然科学基金资助项目(51979128)、江苏省地质矿产勘查局科研资助项目(2019KY03).
引用本文: 刘顺青,王永璐,蔡国军,等.干湿循环和吸力对非饱和下蜀土力学特性影响的试验研究[J].东南大学学报(自然科学版),2021,51(3):473-479. DOI:10.3969/j.issn.1001-0505.2021.03.016.
更新日期/Last Update: 2021-05-20