干湿循环作用下渠道膨胀土裂隙演化规律及强度特性

杨涛; 姜海波; 赵海蛟

doi:10.11988/ckyyb.20221706

PDF(5932 KB)

长江科学院院报 ›› 2024, Vol. 41 ›› Issue (6) : 136-142. DOI: 10.11988/ckyyb.20221706

岩土工程

干湿循环作用下渠道膨胀土裂隙演化规律及强度特性

杨涛¹, 姜海波¹, 赵海蛟²

作者信息 +

Fracture Evolution and Strength Characteristics of Channel Expansive Soil under Wetting-Drying Cycles

YANG Tao¹, JIANG Hai-bo¹, ZHAO Hai-jiao²

Author information +

文章历史 +

摘要

为探究干湿循环作用下膨胀土渠道边坡裂隙演化特征与强度衰减规律,对北疆某渠道膨胀土开展了不同压实度的干湿循环试验,利用图像处理技术提取膨胀土表面裂隙参数,利用直剪试验测得膨胀土抗剪强度,并分析黏聚力随裂隙率的变化规律。结果表明:在干湿循环作用下,黏聚力的衰减速率随着压实度的增大而增大,内摩擦角总体呈减小趋势,裂隙率的增加速率随着压实度的增加而减小;裂隙相对面积呈先增后减的变化规律。最后,拟合获得不同压实度膨胀土黏聚力与表面裂隙率之间的关系式,通过确定膨胀土表层裂隙率可计算出其黏聚力。研究成果为进一步揭示剧烈干湿变化诱发的膨胀土渠道边坡失稳破坏提供了重要依据。

Abstract

To investigate crack evolution characteristics and strength degradation patterns of expansive soil channel slopes subjected to dry-wet cycles, we conducted cyclic dry-wet tests on expansive soil with varied compactness from a channel in northern Xinjiang. Surface crack parameters were extracted using image processing technology, while shear strength was determined via direct shear testing. The relationship between cohesion and crack rate was analyzed. Our findings indicate that, under cyclic drying and wetting, cohesion decay accelerates with higher compaction, while internal friction angle generally decreases. The increase in crack rate slows as compaction rises. The relative crack area initially increases, followed by a decrease. Finally, we established a relationship between cohesion and surface crack rate through fitting. This enables the calculation of expansive soil’s cohesive force based on its surface crack rate. The research findings provide crucial insights into understanding the instability and failure of expansive soil channel slopes under severe dry-wet fluctuations.

导出引用

杨涛, 姜海波, 赵海蛟. 干湿循环作用下渠道膨胀土裂隙演化规律及强度特性[J]. 长江科学院院报. 2024, 41(6): 136-142 https://doi.org/10.11988/ckyyb.20221706

YANG Tao, JIANG Hai-bo, ZHAO Hai-jiao. Fracture Evolution and Strength Characteristics of Channel Expansive Soil under Wetting-Drying Cycles[J]. Journal of Changjiang River Scientific Research Institute. 2024, 41(6): 136-142 https://doi.org/10.11988/ckyyb.20221706

中图分类号： TU443

参考文献

[1] 殷宗泽, 袁俊平. 膨胀土特性与边坡稳定[M]. 北京: 科学出版社, 2018. (YIN Zong-ze, YUAN Jun-ping. Characteristics of Expansive Soil and Slope Stability[M]. Beijing: Science Press, 2018.(in Chinese))
[2] 朱洵, 李国英, 蔡正银, 等. 湿干循环下膨胀土渠道边坡的破坏模式及稳定性[J]. 农业工程学报, 2020, 36(4): 159-167. (ZHU Xun, LI Guo-ying, CAI Zheng-yin, et al. Failure Modes and Slope Stability of Expansive Soil Canal under Wet-dry Cycles[J]. Transactions of the Chinese Society of Agricultural Engineering, 2020, 36(4): 159-167.(in Chinese))
[3] NOWAMOOZ H,MASROURI F.Relationships between Soil Fabric and Suction Cycles in Compacted Swelling Soils[J]. Engineering Geology, 2010, 114(3/4): 444-455.
[4] 徐永福,史春乐.膨胀土的强度特性[J].长江科学院院报,1997(1):39-42.(XU Yong-fu, SHI Chun-le. Strength Characteristics of Expansive Soils[J].Journal of Yangtze River Scientific Research Institute,1997(1):39-42.(in Chinese))
[5] 胡旭辉, 张坤勇, 聂美军, 等. 干湿循环条件对膨胀土强度指标的影响[J]. 中南大学学报(自然科学版), 2022, 53(1): 269-279. (HU Xu-hui, ZHANG Kun-yong, NIE Mei-jun, et al. Effect of Experimental Conditions on Strength Indexes of Expansive Soil during Wet-dry Cycles[J]. Journal of Central South University (Science and Technology), 2022, 53(1): 269-279.(in Chinese))
[6] 杨和平, 张锐, 郑健龙. 有荷条件下膨胀土的干湿循环胀缩变形及强度变化规律[J]. 岩土工程学报, 2006, 28(11): 1936-1941. (YANG He-ping, ZHANG Rui, ZHENG Jian-long. Variation of Deformation and Strength of Expansive Soil during Cyclic Wetting and Drying under Loading Condition[J]. Chinese Journal of Geotechnical Engineering, 2006, 28(11): 1936-1941.(in Chinese))
[7] 杨和平, 唐咸远, 王兴正, 等. 有荷干湿循环条件下不同膨胀土抗剪强度基本特性[J]. 岩土力学, 2018, 39(7): 2311-2317. (YANG He-ping, TANG Xian-yuan, WANG Xing-zheng, et al. Shear Strength of Expansive Soils under Wet-dry Cycles with Loading[J]. Rock and Soil Mechanics, 2018, 39(7): 2311-2317.(in Chinese))
[8] 边加敏. 弱膨胀土干湿循环直剪强度试验研究[J]. 长江科学院院报, 2018, 35(6): 81-85, 91. (BIAN Jia-min. Direct Shear Test on Strength of Weak Expansive Soil under Dry-wet Cycles[J]. Journal of Yangtze River Scientific Research Institute, 2018, 35(6): 81-85, 91.(in Chinese))
[9] 唐朝生, 施斌, 刘春. 膨胀土收缩开裂特性研究[J]. 工程地质学报, 2012, 20(5): 663-673. (TANG Chao-sheng, SHI Bin, LIU Chun. Study on Desiccation Cracking Behaviour of Expansive Soil[J]. Journal of Engineering Geology, 2012, 20(5): 663-673.(in Chinese))
[10] 冷挺, 唐朝生, 施斌. 干湿循环条件下重塑膨胀土的裂隙发育特征及量化研究[J]. 工程地质学报, 2016, 24(5): 856-862. (LENG Ting, TANG Chao-sheng, SHI Bin. Quantifying Desiccation Crack Behaviour of Remolded Expansive Soil during wetting-drying Circles[J]. Journal of Engineering Geology, 2016, 24(5): 856-862.(in Chinese))
[11] 袁俊平, 殷宗泽, 包承纲. 膨胀土裂隙的量化手段与度量指标研究[J]. 长江科学院院报, 2003, 20(6): 27-30. (YUAN Jun-ping, YIN Zong-ze, BAO Cheng-gang. Quantitative Description Method & Index for Fissures in Expansive Soils[J]. Journal of Yangtze River Scientific Research Institute, 2003, 20(6): 27-30.(in Chinese))
[12] 胡东旭, 李贤, 周超云, 等. 膨胀土干湿循环胀缩裂隙的定量分析[J]. 岩土力学, 2018, 39(增刊1): 318-324. (HU Dong-xu, LI Xian, ZHOU Chao-yun, et al. Quantitative Analysis of Swelling and Shrinkage Cracks in Expansive Soil under Dry-wet Cycle[J]. Rock and Soil Mechanics, 2018, 39(Supp.1): 318-324.(in Chinese))
[13] 杜泽丽. 干湿循环条件下膨胀土的力学性质与开裂行为[J]. 水电能源科学, 2020, 38(11): 141-144. (DU Ze-li. Mechanical Properties and Cracking Behavior of Expansive Soil under Dry and Wet Cycling Conditions[J]. Water Resources and Power, 2020, 38(11): 141-144.(in Chinese))
[14] 朱锐,黄英豪,张晨,等.季节性供水渠道边坡稳定性研究[J].水利水运工程学报,2021(1):124-132.(ZHU Rui, HUANG Ying-hao, ZHANG Chen, et al. Research on the Slope Stability of Seasonally Running Canals[J]. Hydro-science and Engineering, 2021(1): 124-132.(in Chinese))
[15] 曾召田,吕海波,赵艳林,等.膨胀土干湿循环效应及其对边坡稳定性的影响[J].工程地质学报,2012,20(6):934-939.(ZENG Zhao-tian, LÜ Hai-bo, ZHAO Yan-lin, et al. Wetting-Drying Effect of Expansive Soils and Its Influence on Slope Stability[J]. Journal of Engineering Geology, 2012, 20(6): 934-939.(in Chinese))
[16] 廖智伟. 干湿循环下膨胀土体力学特性和边坡稳定性研究[D]. 成都: 西华大学, 2020. (LIAO Zhi-wei. Study on Mechanical Characteristics and Slope Stability of Expansive Soil under Dry-wet Cycle[D].Chengdu: Xihua University, 2020. (in Chinese))
[17] 杨俊, 童磊, 张国栋, 等. 干湿循环效应对风化砂改良膨胀土抗剪强度影响研究[J]. 长江科学院院报, 2014, 31(4): 39-44. (YANG Jun, TONG Lei, ZHANG Guo-dong, et al. Influence of Wet-dry Cycles on the Shear Strength of Expansive Soil Modified by Weathered Sand[J]. Journal of Yangtze River Scientific Research Institute, 2014, 31(4): 39-44.(in Chinese))
[18] 张家俊, 龚壁卫, 胡波, 等. 干湿循环作用下膨胀土裂隙演化规律试验研究[J]. 岩土力学, 2011, 32(9): 2729-2734. (ZHANG Jia-jun, GONG Bi-wei, HU Bo, et al. Study of Evolution Law of Fissures of Expansive Clay under Wetting and Drying Cycles[J]. Rock and Soil Mechanics, 2011, 32(9): 2729-2734.(in Chinese))
[19] 程展林, 李青云, 郭熙灵, 等. 膨胀土边坡稳定性研究[J]. 长江科学院院报, 2011, 28(10): 102-111. (CHENG Zhan-lin, LI Qing-yun, GUO Xi-ling, et al. Study on the Stability of Expansive Soil Slope[J]. Journal of Yangtze River Scientific Research Institute, 2011, 28(10): 102-111.(in Chinese))
[20] 林京松. 干湿循环含低应力条件下百色膨胀土抗剪强度特性[D]. 长沙: 长沙理工大学, 2016. (LIN Jing-song. Shear Strength Characteristic of Baise Expansive Soil under the Conditions of Drying-wetting Cycle and Lower Stress[D].Changsha: Changsha University of Science & Technology, 2016. (in Chinese))
[21] 杨和平,王兴正,肖杰.干湿循环效应对南宁外环膨胀土抗剪强度的影响[J].岩土工程学报,2014,36(5):949-954.(YANG He-ping, WANG Xing-zheng, XIAO Jie. Influence of Wetting-drying Cycles on Strength Characteristics of Nanning Expansive Soils[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(5): 949-954.(in Chinese))
[22] 黄震, 傅鹤林, 韦秉旭, 等. 等幅干湿循环条件下膨胀土的低应力抗剪强度特征[J]. 四川大学学报(工程科学版), 2016, 48(1): 70-77. (HUANG Zhen, FU He-lin, WEI Bing-xu, et al. Low Stress Shear Strength Characteristics of Expansive Soil under Constant Amplitude Dry Wet Cycle Conditions[J]. Journal of Sichuan University (Engineering Science Edition), 2016, 48(1): 70-77.(in Chinese))
[23] 任旺,王家鼎,卞小芮.干湿循环下新近系黏土杂岩裂隙演化研究[J].水文地质工程地质,2021,48(5):161-167.(REN Wang,WANG Jia-ding,BIAN Xiao-rui.A Study of Fissures Evolution of the Neogene Clay Complexes under Wetting and Drying Cycles[J]. Hydrogeology & Engineering Geology,2021,48(5): 161-167.(in Chinese))
[24] 刘观仕,陈永贵,张贵保,等.压实条件对膨胀土裂隙发育影响的试验研究[J].长江科学院院报,2019,36(11):91-97.(LIU Guan-shi, CHEN Yong-gui,ZHANG Gui-bao,et al.Crack Propagation Law of Compacted Expansive Soil with Various Original Compactness and Water Content[J]. Journal of Yangtze River Scientific Research Institute, 2019, 36(11): 91-97.(in Chinese))
[25] 汪时机, 杨振北, 李贤, 等. 干湿交替下膨胀土裂隙演化与强度衰减规律试验研究[J]. 农业工程学报, 2021, 37(5): 113-122. (WANG Shi-ji, YANG Zhen-bei, LI Xian, et al. Experimental Study on Crack Evolution and Strength Attenuation of Expansive Soil under Wetting-drying Cycles[J]. Transactions of the Chinese Society of Agricultural Engineering, 2021, 37(5): 113-122.(in Chinese))