| Citation: |
WEI Zhanxi, XIE Dongwu, WU Yuanzhao, MA Wenli, LI Yuan, LI Wanhua. Research on landslide stability under different water content conditions based on the dynamic residual strength[J]. Hydrogeology & Engineering Geology, 2022, 49(2): 126-136. doi: 10.16030/j.cnki.issn.1000-3665.202104055
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Research on landslide stability under different water content conditions based on the dynamic residual strength
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Abstract
Long-term rainfall causes progressive damage to a slope. In this process, the slip zone soil will reach the residual strength under different water-containing states with the change of water content. The traditional strain softening model cannot accurately express the dynamic characteristics of the residual strength of the slip zone soil during this change, resulting in difficulty to get close to reality in the simulation of the landslide development process. The strain softening model that involves the dynamic residual strength can more realistically simulate the development of the stability of the landslide when the water content changes. Based on this, the field investigation was carried out on the Kualiangzi landslide in Zhongjiang County in Sichuan, and the slip zone soil was obtained through the on-site shaft. The ring shear test is used to study the relationship between the mechanical parameters of the slip zone soil and the water content, and a strain softening model based on the dynamic residual strength is established to simulate the development of the Kualiangzi landslide when the slip zone soil is at different water content stages. The evolution process of the landslide through the evolution of the plastic zone and the sliding surface is analyzed and compared with the current failure characteristics. The research results show that the increase of water content makes the shear resistance of slip zone soil attenuate significantly, the peak and residual shear strength decrease almost linearly, and the residual strength parameters show the characteristics of cubic attenuation. The strain softening model established based on the attenuation law of residual strength parameters simulates the deformation and failure process of the Kualiangzi landslide. It is found that when the water content of the slip zone soil is less than 20%, the slope only produces a plastic zone at the front edge; when the water content reaches 22%, a plastic zone and a non-penetrated sliding surface begin to appear in the middle and upper parts of the slope; when the water content of the slip zone soil reaches 24%, the plastic zone tends to penetrate, the landslide enters a state of accelerated deformation, and tensile cracks are generated on the slope surface; when the water content reaches 26%, the landslide is in a state of instability, and the development of the tensile plastic zone and failure surface of the slope is highly consistent with the current failure characteristics of the landslide. The results can provide a certain theoretical basis for the stability study of related landslides.
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References
[1] 马云长, 苏培东, 郑智洋, 等. 基于滑带土应变软化的滑坡渐进破坏研究[C]//2019年全国工程地质学术年会论文集. 北京, 2019: 181 − 187.[MA Yunchang, SU Peidong, ZHENG Zhiyang, et al.Progressive failure research of landslide based on strain fostening of sliding zone soil[C]//Proceedings of the 2019 Engineering Geology Session. Beijing,2019:181-197.(in Chinese with English Abstract)] [2] Itasca Consulting Group Inc. FLAC3D: Fast lagrangian analysis of continua in 3 dimensions user manual (Version3.0)[M]. Minneapolis: Consulting Group Inc, 2005. [3] 宋雪琳, 谢勋, 齐剑峰, 等. 云南哀牢山某滑坡滑体与滑带土工程性质试验研究[J]. 水文地质工程地质,2010,37(4):77 − 80. [SONG Xuelin, XIE Xun, QI Jianfeng, et al. A study on the engineering properties of sliding-body and sliding-zone soil at Ailaoshan in Yunnan Province[J]. Hydrogeology & Engineering Geology,2010,37(4):77 − 80. (in Chinese with English abstract) doi: 10.3969/j.issn.1000-3665.2010.04.016 [4] 张怡颖, 郭长宝, 杨志华, 等. 四川茂县周场坪深层滑坡滑带土环剪试验强度研究[J]. 工程地质学报,2021,29(3):764 − 776. [ZHANG Yiying, GUO Changbao, YANG Zhihua, et al. Study on shear strength of deep-seated sliding zone soil of zhouchangping landslide in Maoxian, Sichuan[J]. Journal of Engineering Geology,2021,29(3):764 − 776. (in Chinese with English abstract) [5] 黄斌, 傅旭东, 谭凡, 等. 含水率对滑带土强度及变形影响试验研究[J]. 岩土力学,2012,33(9):2613 − 2618. [HUANG Bin, FU Xudong, TAN Fan, et al. Experimental study of relationship between water content and strength or deformation of slip soil[J]. Rock and Soil Mechanics,2012,33(9):2613 − 2618. (in Chinese with English abstract) [6] 李文, 龙建辉, 李同录, 等. 陕西泾阳南塬黄土滑坡滑带土残余剪切强度特性[J]. 地球科学与环境学报,2012,34(4):95 − 101. [LI Wen, LONG Jianhui, LI Tonglu, et al. Residual shear strength characteristics of landslide soil in loess landslide of Jingyang southern highland, Shaanxi[J]. Journal of Earth Sciences and Environment,2012,34(4):95 − 101. (in Chinese with English abstract) doi: 10.3969/j.issn.1672-6561.2012.04.013 [7] 饶鸿, 王金淑, 赵志明, 等. 基于有限元软件自定义本构模型的膨胀土边坡降雨入渗分析[J]. 水文地质工程地质,2021,48(1):154 − 162. [RAO Hong, WANG Jinshu, ZHAO Zhiming, et al. An analysis of rainfall infiltration of expansive soil slope based on the finite element software custom constitutive model[J]. Hydrogeology & Engineering Geology,2021,48(1):154 − 162. (in Chinese with English abstract) [8] SRBULOV M. A simple method for the analysis of stability of slopes in brittle soil[J]. Soils and Foundations,1995,35(4):123 − 127. doi: 10.3208/sandf.35.4_123 [9] 刘忠玉, 陈少伟. 应变软化土质边坡渐进破坏的演化模型[J]. 郑州大学学报(工学版),2002,23(2):37 − 40. [LIU Zhongyu, CHEN Shaowei. Evolution model of progressive failure of strain-softening soil slopes[J]. Journal of Zhengzhou University of Technology,2002,23(2):37 − 40. (in Chinese with English abstract) [10] 陈国庆, 黄润秋, 周辉, 等. 边坡渐进破坏的动态强度折减法研究[J]. 岩土力学,2013,34(4):1140 − 1146. [CHEN Guoqing, HUANG Runqiu, ZHOU Hui, et al. Research on progressive failure for slope using dynamic strength reduction method[J]. Rock and Soil Mechanics,2013,34(4):1140 − 1146. (in Chinese with English abstract) [11] 薛海斌, 党发宁, 尹小涛, 等. 应变软化边坡稳定性分析方法研究[J]. 岩土工程学报,2016,38(3):570 − 576. [XUE Haibin, DANG Faning, YIN Xiaotao, et al. Stability analysis methods for strain-softening slopes[J]. Chinese Journal of Geotechnical Engineering,2016,38(3):570 − 576. (in Chinese with English abstract) doi: 10.11779/CJGE201603022 [12] 卢应发, 张凌晨, 张玉芳, 等. 边坡渐进破坏多参量评价指标[J]. 工程力学,2021,38(3):132 − 147. [LU Yingfa, ZHANG Lingchen, ZHANG Yufang, et al. Multi parameter evaluation index of progressive failure of landslide[J]. Engineering Mechanics,2021,38(3):132 − 147. (in Chinese with English abstract) doi: 10.6052/j.issn.1000-4750.2020.05.0286 [13] 何怡, 郭力, 马冲. 考虑软弱夹层中岩土体应变软化特性的矿山边坡变形体渐进破坏分析[J]. 安全与环境工程,2020,27(2):162 − 167. [HE Yi, GUO Li, MA Chong. Progressive failure of deformed rock body on the mine slope considering strain softening characteristics of rock and soil in weak interlayer[J]. Safety and Environmental Engineering,2020,27(2):162 − 167. (in Chinese with English abstract) [14] 罗忠行, 雷宏权. 基于FLAC3D的米贝复式滑坡稳定性分析[J]. 中国地质灾害与防治学报,2020,31(4):52 − 62. [LUO Zhongxing, LEI Hongquan. Study on Mibei landslide analysis based on FLAC3D[J]. The Chinese Journal of Geological Hazard and Control,2020,31(4):52 − 62. (in Chinese with English abstract) [15] 陈思娇. 四川中江垮梁子滑坡滑带土强度特性及滑坡变形机理研究[D]. 成都: 成都理工大学, 2014. CHEN Sijiao. Study on shear strength properties of slip soils and deformation mechanism of Kualiangzi landslide in Zhongjiang of Sichuan[D]. Chengdu: Chengdu University of Technology, 2014. (in Chinese with English abstract) [16] 吉随旺, 张倬元, 王凌云, 等. 近水平软硬互层斜坡变形破坏机制[J]. 中国地质灾害与防治学报,2000,11(3):49 − 52. [JI Suiwang, ZHANG Zhuoyuan, WANG Lingyun, et al. The mechanism of deformation and failure for the slope composed of nearly horizontal competent and incompetent intercalated rock mass strata[J]. The Chinese Journal of Geological Hazard and Control,2000,11(3):49 − 52. (in Chinese with English abstract) doi: 10.3969/j.issn.1003-8035.2000.03.012 [17] 许成顺, 尹占巧, 杜修力, 等. 黏性土的抗剪强度特性试验研究[J]. 水利学报,2013,44(12):1433 − 1438. [XU Chengshun, YIN Zhanqiao, DU Xiuli, et al. Experimental study of shear strength of clay[J]. Journal of Hydraulic Engineering,2013,44(12):1433 − 1438. (in Chinese with English abstract) [18] 王永璐, 刘顺青, 姜朋明. 含水率及吸力对非饱和下蜀土强度特性影响试验研究[J]. 三峡大学学报(自然科学版),2020,42(4):48 − 52. [WANG Yonglu, LIU Shunqing, JIANG Pengming. Experimental study on the influence of moisture content and suction on the strength characteristics of Xiashu soil[J]. Journal of China Three Gorges University (Natural Sciences),2020,42(4):48 − 52. (in Chinese with English abstract) [19] 朱兆波, 王新刚, 朱荣森, 等. 甘肃黑方台黄土滑坡滑带土剪切特性环剪试验研究[J]. 干旱区资源与环境,2021,35(5):144 − 150. [ZHU Zhaobo, WANG Xingang, ZHU Rongsen, et al. Ring shear test on the shear characteristics of sliding zone soil of loess in Heifangtai, Gansu[J]. Journal of Arid Land Resources and Environment,2021,35(5):144 − 150. (in Chinese with English abstract) [20] 赵蕊, 左双英, 王嵩, 等. 不同含水量贵阳重塑红黏土三轴抗剪强度试验研究[J]. 水文地质工程地质,2015,42(5):90 − 95. [ZHAO Rui, ZUO Shuangying, WANG Song, et al. Experiment and mechanism analysis of water contents on triaxial shear strength of the remodeled red clay of Guiyang[J]. Hydrogeology & Engineering Geology,2015,42(5):90 − 95. (in Chinese with English abstract) [21] 夏志皋. 塑性力学[M]. 上海: 同济大学出版社, 1991. XIA Zhigao. Plastic mechanics [M]. Shanghai: Tongji University Press, 1991. (in Chinese) [22] 郑颖人, 孔亮. 岩土塑性力学[M]. 北京: 中国建筑工业出版社, 2010. ZHENG Yingren, KONG Liang. Geotechnical plastic mechanics[M]. Beijing: China Architecture & Building Press, 2010. (in Chinese) [23] HAJIABDOLMAJID V, KAISER P. Brittleness of rock and stability assessment in hard rock tunneling[J]. Tunnelling and Underground Space Technology,2003,18(1):35 − 48. doi: 10.1016/S0886-7798(02)00100-1 [24] 王伟, 陈国庆, 郑水全, 等. 考虑张拉-剪切渐进破坏的边坡矢量和法研究[J]. 岩土力学,2019,40(增刊 1):468 − 476. [WANG Wei, CHEN Guoqing, ZHENG Shuiquan, et al. Study on the vector sum method of slope considering tensile-shear progressive failure[J]. Rock and Soil Mechanics,2019,40(Sup 1):468 − 476. (in Chinese with English abstract) [25] 王伟. 考虑张拉-剪切渐进破坏的”三段式“边坡稳定性研究[D]. 成都: 成都理工大学, 2019. WANG Wei. Study on the stability of “three sections” slope considering tension and shear progressive failure[D]. Chengdu: Chengdu University of Technology, 2019. (in Chinese with English abstract) -
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WEI Zhanxi, XIE Dongwu, WU Yuanzhao, MA Wenli, LI Yuan, LI Wanhua. Research on landslide stability under different water content conditions based on the dynamic residual strength[J]. Hydrogeology & Engineering Geology, 2022, 49(2): 126-136. doi: 10.16030/j.cnki.issn.1000-3665.202104055
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Figure 1.
Plan of the Kualiangzi landslide
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Figure 2.
X-ray powder diffraction mineral compositions of the slip zone soil minerals[15]
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Figure 3.
ICL-2 type ring shear
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Figure 4.
Shear strength of the slip zone soil with different water content
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Figure 5.
Relationship between the residual shear strength parameters of the slip zone soil and water content
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Figure 6.
Linear strain softening model for strength degradation of geomaterials
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Figure 7.
Multi-segment linear strain softening model based on the dynamic residual strength
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Figure 8.
Computational grid
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Figure 9.
Distribution of the plastic zone in the Kualiangzi landslide
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Figure 10.
Development process of the failure zone of the Kualiangzi landslide
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Figure 11.
The failure mode of the Kualiangzi landslide
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Figure 12.
Dynamic change characteristics of safety coefficient of the Kualiangzi slope