干湿循环作用下膨润土改性黄土微观及水力特性

许健; 刘永昊; 李彦锋; 王瑞涛; 王泽峰

doi:10.20174/j.JUSE.2025.05.10

地下空间与工程学报 >

2025 , Vol. 21 >Issue 5: 1565 - 1575

DOI: https://doi.org/10.20174/j.JUSE.2025.05.10

理论与试验研究

干湿循环作用下膨润土改性黄土微观及水力特性

许健 ,
刘永昊 ,
李彦锋 ,
王瑞涛 ,
王泽峰

展开

1.西安建筑科技大学土木工程学院,西安 710055;
2.西安建筑科技大学陕西省岩土与地下空间工程重点实验室,西安 710055

许健(1980—),男,山东泰安人,博士,教授,主要从事特殊土力学与环境岩土工程等领域的教学与科研工作。E-mail:xujian@xauat.edu.cn

收稿日期: 2024-12-15

网络出版日期: 2025-10-17

基金资助

国家自然科学基金 (52378366);陕西高校青年创新团队(2023-2026)

收起

Research on the Microscopic and Hydraulic Characteristics of Bentonite Modified Loess under Drying-Wetting Cycles Effect

Xu Jian ,
Liu Yonghao ,
Li Yanfeng ,
Wang Ruitao ,
Wang Zefeng

Expand

1. School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, P.R. China;
2. Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, P.R. China

Received date: 2024-12-15

Online published: 2025-10-17

Fold

摘要

膨润土改性黄土具有作为填埋场黏土衬垫层的潜质,但干湿循环作用会引起膨润土改性黄土垫层渗透和力学特性改变,导致垃圾填埋场渗漏或失稳破坏,对改性黄土垫层的长期稳定性产生威胁。以素黄土和膨润土改性黄土为研究对象,开展干湿循环作用下扫描电镜、压汞、柔性壁渗透和单轴压缩试验,从宏细微观多尺度综合分析干湿循环对改性黄土微细观结构、防渗及力学性能的影响规律,探究干湿循环作用下改性黄土的劣化机制。结果表明:膨润土能够用于黄土固化主要源于蒙脱石颗粒的填充效应及吸水膨胀特性;不同干湿循环次数下素黄土的孔隙分布为三峰孔隙结构,改性黄土的孔隙分布为双峰孔隙结构;素黄土的渗透系数随干湿循环次数增加逐渐增大,而改性黄土渗透系数在5次干湿循环后趋于稳定;素黄土和膨润土改性黄土的单轴抗压强度在5次干湿循环后均趋于稳定,不同干湿循环次数下改性黄土单轴抗压强度均高于素黄土。

关键词： 干湿循环; 膨润土改性黄土; 微观结构; 渗透系数; 单轴抗压强度

本文引用格式

许健 , 刘永昊 , 李彦锋 , 王瑞涛 , 王泽峰 . 干湿循环作用下膨润土改性黄土微观及水力特性[J]. 地下空间与工程学报, 2025 , 21(5) : 1565 -1575 . DOI: 10.20174/j.JUSE.2025.05.10

Abstract

Bentonite modified loess has the potential to serve as a clay liner layer in landfills, but the drying-wetting cycles can cause changes in the permeability and mechanical properties of the bentonite modified loess cushion layer, leading to leakage or instability damage in landfills, posing a threat to the long-term stability of the modified loess cushion layer. Taking plain loess and bentonite modified loess as research objects, experiments were conducted under different drying-wetting cycles, including scanning electron microscopy, mercury intrusion, flexible wall permeability, and uniaxial compression. The effects of dry-wet cycles on the microstructure, anti-seepage performance, and mechanical properties of modified loess were comprehensively analyzed at macro, micro, and nano scales, and the deterioration mechanism of modified loess under drying-wetting cycles was explored. The results show that: Bentonite can be used for loess solidification mainly due to the filling effect and water absorption and expansion characteristics of montmorillonite particles. The pore distribution of plain loess under different drying-wetting cycles is a three peak pore structure, while the pore distribution of modified loess is a bimodal pore structure; The permeability coefficient of plain loess continues to increase with the increase of drying-wetting cycles, while the permeability coefficient of modified loess tends to stabilize after five drying-wetting cycles; The uniaxial compression strength of both plain loess and bentonite modified loess tend to reach a stable value after five dry-wet cycles. Under different drying-wetting cycles, the uniaxial compressive strength of modified loess is higher than that of plain loess.

Key words： drying-wetting cycles; bentonite modified loess; microstructure; permeability coefficient; uniaxial compressive strength

参考文献

[1] 中华人民共和国住房和城乡建设部. 生活垃圾卫生填埋场防渗系统工程技术标准(GB/T 51403—2021)[S].北京: 中国建筑工业出版社,2021.(Ministry of Housing and Urban Rural Development of the People's Republic of China. Technical standard for liner system of municipal solid waste sanitary landfill(GB/T 51403—2021)[S].Beijing: China Building Industry Press, 2021. (in Chinese))
[2] 张虎元, 赵天宇, 吴军荣, 等. 膨润土改性黄土衬里防渗性能室内测试与预测[J]. 岩土力学, 2011, 32(7): 1963-1969,1974. (Zhang Huyuan,Zhao Tianyu,Wu Junrong, et al. Laboratory measurement and prediction to the permeability of bentonite-modified loess as a landfill liner[J]. Rock and Soil Mechanics, 2011, 32(7):1963-1969, 1974. (in Chinese))
[3] 郄玥颖, 张鹏, 崔自治, 等. 膨润土改性黄土的强度特性[J].河北农业大学学报, 2017, 40(6): 125-128. (Qie Yueying, Zhang Peng, Cui Zizhi, et al. The strength characteristics of loess modified with bentonite[J]. Journal of Agricultural University of Hebei, 2017,40(6):125-128. (in Chinese))
[4] 杨博, 张虎元, 赵天宇, 等. 改性黄土渗透性与孔隙结构的依存关系[J]. 水文地质工程地质, 2011, 38(6): 6. (Yang Bo, Zhang Huyuan, Zhao Tianyu, et al. Dependence between permeability and pore structure of modified loess[J]. Hydrogeology＆Engineering Geology, 2011, 38(6):6. (in Chinese))
[5] 胡江洋, 郭志豪, 潘涛, 等. 干湿循环作用下伊犁黄土强度劣化试验研究[J].地下空间与工程学报, 2023, 19(增1): 181-191. (Hu Jiangyang, Guo Zhihao, Pan Tao, et al. Strength Deterioration Experimental Study of Ili Loess under Dry-Wet Cycle Effect[J]. Chinese Journal of Underground Space and Engineering, 2023,19(Supp.1):181-191. (in Chinese))
[6] 潘振兴, 杨更社, 叶万军, 等. 干湿循环作用下原状黄土力学性质及细观损伤研究[J]. 工程地质学报, 2020, 28(6):7. (Pan Zhenxing,Yang Gengshe,Ye Wanjun, et al. Study on mechanical properties and microscopic damage of undisturbed loess under dry and wet cycles[J]. Journal of Engineering Geology,2020, 28(6): 7. (in Chinese))
[7] 刘奉银, 张昭, 周冬, 等. 密度和干湿循环对黄土土-水特征曲线的影响[J]. 岩土力学, 2011, 32(增2): 132-136,142. (Liu Fengyin, Zhang Zhao, Zhou Dong, et al. Effects of initial density and drying-wetting cycle on soil water characteristic curve of unsaturated loess[J]. Rock and Soil Mechanics, 2011, 32 (Supp.2): 132-136,142. (in Chinese))
[8] 景静, 孙文, 江肖鹏. 干湿循环对非饱和黄土渗透系数的影响研究[J]. 水资源与水工程学报, 2020, 31(6): 224-229. (Jing Jing, Sun Wen, Jiang Xiaopeng. Influence of dry - wet cycles on the permeability coefficient of unsaturated loess[J]. Journal of Water Resources ＆ Water Engineering, 2020, 31(6): 224-229. (in Chinese))
[9] 钟秀梅, 王谦, 刘钊钊, 等. 干湿循环作用下粉煤灰改良黄土路基的动强度试验研究[J]. 岩土工程学报, 2020, 42(增1): 95-05. (Zhong Xiumei, Wang Qian, Liu Zhaozhao, et al. Dynamic strength of fly ash-modified loess subgrade under influences of drying-wetting cycle[J]. Chinese Journal of Geotechnical Engineering, 2020,42(Supp.1):95-05. (in Chinese))
[10] 蒋应军, 王翰越, 乔怀玉, 等. 水、干湿及冻融循环作用下水泥改良黄土路基稳定性[J]. 科学技术与工程, 2020, 20(35): 14592-14599. (Jiang Yingjun, Wang Hanyue, Qiao Huaiyu,et al. Stability of cement-modified loess subgrade under water,wet-dry and freezing-thawing cycles[J]. Science Technology and Engineering, 2020, 20(35): 14592-14599. (in Chinese))
[11] 魏路. 膨润土改性黄土的干湿损伤及浸水自愈合[D].银川: 宁夏大学,2020. (Wei Lu. Wet and dry damage of bentonite modified loess and self-healing after soaking in water[D]. Yinchuan: Ningxia University, 2020. (in Chinese))
[12] 中华人民共和国水利部. 土工试验方法标准(GB/ T50123-2019) [S].北京:中国计划出版社, 2019. (Ministry of Water Resources of the People's Republic of China. Standard for geotechnical testing method(GB/ T50123-2019) [S]. Beijing: China Planning Publishing Press, 2007. (in Chinese))
[13] 许健, 武智鹏, 陈辉. 干湿循环效应下玄武岩纤维加筋黄土三轴剪切力学行为研究[J]. 岩土力学, 2022,43(1):28-36. (Xu Jian, Wu Zhipeng, Chen Hui. Triaxial shear behavior of basalt fiber reinforced loess under drying-wetting cycles[J]. Rock and Soil Mechanics, 2022,43(1):28-36. (in Chinese))
[14] Xu J, Li Y, Wang S, et al. Shear strength and mesoscopic character of undisturbed loess with sodium sulfate after dry-wet cycling[J]. Bulletin of Engineering Geology and the Environment, 2020, 79:1523-1541.
[15] Li X, Zhang LM. Characterizationof dual-structure pore-size distribution of soil[J]. Canadian Geotechnical Journal, 2009, 46:129-141.
[16] 李燕, 李同录, 侯晓坤, 等. 用孔隙分布曲线预测压实黄土非饱和渗透曲线及其适用范围的探讨[J]. 岩土力学, 2021, 42(9):2395-2404. (Li Yan, Li Tonglu, Hou Xiaokun, et al. Prediction of unsaturated permeability curve of compaction loess with pore-size distribution curve and its application scope[J]. Rock and Soil Mechanics, 2021, 42(9):2395-2404. (in Chinese))
[17] Tang C S, Cheng Q, Leng T, et al. Effects of wetting-drying cycles and desiccation cracks on mechanical behavior of an unsaturated soil[J]. Catena, 2020, 194:104721.
[18] Shin H, Santamarina J C. Desiccation cracks in saturated fine-grained soils:particle-level phenomena and effective-stress analysis[J].Géotechnique,2011, 61:961-972.
[19] 刘俊东, 唐朝生, 曾浩, 等. 干湿循环条件下黏性土干缩裂隙演化特征[J]. 岩土力学, 2021(10): 2763-2772. (Liu Jundong, Tang Chaosheng, Zeng Hao, et al. Evolution of desiccation cracking behavior of clays under drying-wetting cycles[J]. Rock and Soil Mechanics,2021(10): 2763-2772. (in Chinese))
[20] 李向宁, 倪万魁, 王熙俊, 等. 干湿循环过程中压实黄土的胀缩变形特性研究[J]. 地下空间与工程学报, 2021, 17(1): 179-188. (Li Xiangning, Ni Wankui, Wang Xijun, et al. Study on the Swelling Shrinkage Deformation Characteristics of Compacted Loess during the Drying and Wetting Cycles[J]. Chinese Journal of Underground Space and Engineering, 2021, 17(1): 179-188. (in Chinese))
[21] 刘越, 陈东霞, 王晖, 等. 干湿循环下考虑裂隙发育的残积土边坡响应分析[J]. 岩土力学, 2021, 42(7): 1933-1943,1982. (Liu Yue, Chen Dongxia, Wang Hui, et al. Response analysis of residual soil slope considering crack development under drying-wetting cycles[J]. Rock and Soil Mechanics, 2021, 42(7): 1933-1943,1982. (in Chinese))
[22] Liu J, Song S, Cao X, et al. Determination of full-scale pore size distribution of Gaomiaozi bentonite and its permeability prediction[J].Journal of Rock Mechanics and Geotechnical Engineering, 2020, 12:403-413.
[23] 宋亚亚, 朱佩宁, 卢廷浩, 等. 干湿循环作用下非饱和重塑黏土变形特性研究[J]. 地下空间与工程学报, 2022, 18(4): 1219-1225,1240. (Song Yaya, Zhu Peining, Lu Tinghao, et al. Experimental Study of Wetting-Drying on Deformation Behaviors of Unsaturated Remoulded Clay[J]. Chinese Journal of Underground Space and Engineering, 2022, 18(4): 1219-1225,1240. (in Chinese))
[24] 骆赵刚, 汪时机, 杨振北. 膨胀土湿干胀缩裂隙演化及其定量分析[J]. 岩土力学, 2020, 41(7): 2313-2323. (Luo Zhaogang, Wang Shiji, Yang Zhenbei. Quantitative analysis of fracture evolution of expansive soils under wetting-drying cycles Rock and Soil Mechanics, 2020, 41(7): 2313-2323. (in Chinese))

Options

文章导航

模态框（Modal）标题

摘要

本文引用格式

Abstract

参考文献