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摘要: 应用南宁膨胀土开展低应力下的常规饱和慢剪、固结快剪、快剪试验, 获得了抗剪强度随竖向应力的变化规律, 分析了低应力对抗剪强度的影响。进行了75、100、200、300kPa竖向压力下的残余强度试验, 运用Seep/W和Slope/W软件, 考虑降雨入渗条件, 采用M-P、Ordinary和Bishop三种极限平衡法对各抗剪强度下膨胀土边坡的稳定性进行对比分析。分析结果表明: 各抗剪强度受低应力的影响显著, 均呈非线性, 可用幂函数表达; 饱和慢剪强度在低应力时最小, 高应力时最大; 采用含低应力饱和非线性慢剪强度进行边坡稳定分析结果与实际发生的浅层破坏吻合。Abstract: Conventional saturated slow shear test, solidification quick shear test and quick shear test were carried out for Nanning expansive soil under low stresses condition, the change laws of various shear strengths with the change of vertical stresses were gotten, and the influences of low stresses on various shear strengths were analyzed.Residual shear strength tests were performed under the vertical stresses of 75, 100, 200 and 300 kPa, and the expansive soil slop stabilities at various shear strengths were compared by using the softwares of Seep/W and Slope/W with the consideration of rainfall infiltration and three limit equilibrium methods including M-P method, Ordinary method and Bishop method.Analysis result shows that the shear strengths are significantly influenced by the low stresses.The influences have nonlinear trends and the trends can be expressed by power functions.The saturated slow shear strength is lowest at low stress and highest at high stress.The stability analysis result of expansive soil slope calculated by nonlinear saturated slow shear at low stress is consistent with the actual slope failure situation.
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Key words:
- expansive soil slope /
- shallow failure /
- stability analysis /
- low stress /
- shear strength
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图 5 土水特征曲线与渗透性函数曲线
Figure 5. Curves of soil-water characteristic and permeability function
图 10 安全系数与降雨历时的关系
Figure 10. Relations between safety coeffiicient and rainfall duration
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[1] 包承纲. 非饱和土的形状及膨胀土边坡稳定问题[J]. 岩土工程学报, 2004, 26 (1): 1-15. doi: 10.3321/j.issn:1000-4548.2004.01.001BAO Cheng-gang. Behavior of unsaturated soil and stability of expansive soil slope[J]. Chinese Journal of Geotechnical Engineering, 2004, 26 (1): 1-15. (in Chinese). doi: 10.3321/j.issn:1000-4548.2004.01.001 [2] 孙惠兰, 徐培华. 高等级公路膨胀土地段路基施工技术[J]. 筑路机械与施工机械化, 1999, 16 (4): 35-39. https://www.cnki.com.cn/Article/CJFDTOTAL-ZLJX199904021.htmSUN Hui-lan, XU Pei-hua. Highway expansive soils roadbed construction technology[J]. Road Machinery and Construction Mechanization, 1999, 16 (4): 35-39. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-ZLJX199904021.htm [3] 毛新虎. 公路膨胀土路堑边坡防护方案探讨[J]. 地球科学与环境学报, 2004, 26 (4): 49-53. doi: 10.3969/j.issn.1672-6561.2004.04.011MAO Xin-hu. Discuss of cutting slope treatment project for expansive soil on highway[J]. Journal of Earth Sciences and Environment, 2004, 26 (4): 49-53. (in Chinese). doi: 10.3969/j.issn.1672-6561.2004.04.011 [4] 郭军辉, 阎长虹, 夏良斌, 等. 某一级公路路基填土膨胀性试验[J]. 地球科学与环境学报, 2007, 29 (1): 85-89. doi: 10.3969/j.issn.1672-6561.2007.01.017GUO Jun-hui, YAN Chang-hong, XIA Liang-bin, et al. Experimental study on swelling property of subgrade soil in a first-class highway[J]. Journal of Earth Sciences and Environment, 2007, 29 (1): 85-89. (in Chinese). doi: 10.3969/j.issn.1672-6561.2007.01.017 [5] 肖杰, 杨和平, 李晗峰, 等. 低应力条件下不同密度的南宁膨胀土抗剪强度试验[J]. 中国公路学报, 2013, 26 (6): 15-21. https://www.cnki.com.cn/Article/CJFDTOTAL-ZGGL201306003.htmXIAO Jie, YANG He-ping, LI Han-feng, et al. Shear strength test of Nanning expansive soil with various dry densities and low stresses[J]. China Journal of Highway and Transport, 2013, 26 (6): 15-21. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-ZGGL201306003.htm [6] 汪明元, 徐晗, 杨洪, 等. 非饱和膨胀土边坡破坏机理与稳定性分析[J]. 南水北调与水利科技, 2008, 6 (1): 151-153, 158. https://www.cnki.com.cn/Article/CJFDTOTAL-NSBD200801046.htmWANG Ming-yuan, XU Han, YANG Hong, et al. Analysis methods of unsaturated expansive soil slope[J]. South-toNorth Water Transfers and Water Science and Technology, 2008, 6 (1): 151-153, 158. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-NSBD200801046.htm [7] 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. https://www.cnki.com.cn/Article/CJFDTOTAL-CJKB201110019.htmCHENG 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). https://www.cnki.com.cn/Article/CJFDTOTAL-CJKB201110019.htm [8] 吴珺华, 袁俊平, 卢廷浩. 非饱和膨胀土边坡的稳定性分析[J]. 岩土力学, 2008, 29 (增): 363-367. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX2008S1072.htmWU Jun-hua, YUAN Jun-ping, LU Ting-hao. Stability analysis of unsaturated expansive soil slope[J]. Rock and Soil Mechanics, 2008, 29 (S): 363-367. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX2008S1072.htm [9] 彭良泉, 王钊. 降雨入渗下非饱和膨胀土的性状研究及边坡稳定性分析[C]∥中国土木工程学会土力学及岩土工程分会. 第二届全国非饱和土学术研讨会论文集. 杭州: 浙江大学, 2005: 635-647.PENG Liang-quan, WANG Zhao. Study on unsaturated soil properties and slope stability analysis under rainfall infiltration[C]∥China Civil Engineering Society of Soil Mechanics and Geotechnical Engineering Branch. The Second National Symposium on Unsaturated Soil. Hangzhou: Zhejiang University, 2005: 635-647. (in Chinese). [10] 殷宗泽, 徐彬. 反映裂隙影响的膨胀土边坡稳定性分析[J]. 岩土工程学报, 2011, 33 (3): 454-459. https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC201103027.htmYIN Zong-ze, XU Bin. Slope stability of expansive soil under fissure influence[J]. Chinese Journal of Geotechnical Engineering, 2011, 33 (3): 454-459. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC201103027.htm [11] 徐彬, 殷宗泽, 刘述丽. 膨胀土强度影响因素与规律的实验研究[J]. 岩土力学, 2011, 32 (1): 44-50.XU Bin, YIN Zong-ze, LIU Shu-li. Experimental study of factors influencing expansive soil strength[J]. Rock and Soil Mechanics, 2011, 32 (1): 44-50. (in Chinese). [12] 吕海波, 曾召田, 赵艳林, 等. 膨胀土强度干湿循环试验研究[J]. 岩土力学, 2009, 30 (12): 3797-3802. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201403011.htmLU Hai-bo, ZENG Zhao-tian, ZHAO Yan-lin, et al. Experimental studies of strength of expansive soil in drying and wetting cycles[J]. Rock and Soil Mechanics, 2009, 30 (12): 3797-3802. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201403011.htm [13] 平扬, 刘明智, 郑少河. 降雨入渗条件下的膨胀土边坡稳定性分析[J]. 岩石力学与工程学报, 2004, 23 (增1): 4478-4484. https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX2004S1045.htmPING Yang, LIU Ming-zhi, ZHENG Shao-he. Stability analysis of expansive soil slope with rainfall infiltration[J]. Chinese Journal of Rock Mechanics and Engineering, 2004, 23 (S1): 4478-4484. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX2004S1045.htm [14] 李振霞, 王选仓, 陈渊召, 等. 膨胀土的强度与力学特性[J]. 交通运输工程学报, 2008, 8 (5): 54-60. http://transport.chd.edu.cn/article/id/200805011LI Zhen-xia, WANG Xuan-cang, CHEN Yuan-zhao, et al. Strength and mechanic property of expansive soil[J]. Journal of Traffic and Transportation Engineering, 2008, 8 (5): 54-60. (in Chinese). http://transport.chd.edu.cn/article/id/200805011 [15] LADE P V. The mechanics of surficial failure in soil slopes[J]. Engineering Geology, 2010, 114 (2): 57-64. [16] 杨和平, 湛文涛, 肖杰, 等. 南宁膨胀土作路堤填料的土性试验[J]. 中国公路学报, 2011, 24 (1): 1-7. https://www.cnki.com.cn/Article/CJFDTOTAL-ZGGL201101002.htmYANG He-ping, ZHAN Wen-tao, XIAO Jie, et al. Soil property testing of Nanning expansive soil as embankment filler[J]. China Journal of Highway and Transport, 2011, 24 (1): 1-7. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-ZGGL201101002.htm [17] FREDLUND D G, XING An-qing. Equations for the soil-water characteristic curve[J]. Canadian Geotechnical Journal, 1994, 31 (4): 521-532. [18] VANAPALLI S K, FREDLUND D G, PUFAHL D E, et al. Model for the prediction of shear strength with respect to soil suction[J]. Canadian Geotechnical Journal, 1996, 33 (3): 379-392. [19] 邹群, 邹国平. 高速公路生态护坡技术及其应用[J]. 筑路机械与施工机械化, 2013, 30 (2): 52-54. https://www.cnki.com.cn/Article/CJFDTOTAL-ZLJX201302042.htmZOU Qun, ZOU Guo-ping. Application of ecological slope protection technology to expressway[J]. Road Machinery and Construction Mechanization, 2013, 30 (2): 52-54. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-ZLJX201302042.htm [20] 胡俊, 胡怀雯. 水库地区公路边坡加固及土质大坝防渗处理[J]. 筑路机械与施工机械化, 2013, 30 (3): 48-50, 55. https://www.cnki.com.cn/Article/CJFDTOTAL-ZLJX201303036.htmHU Jun, HU Huai-wen. Highway slope reinforcement and impermeable treatment of earth dam in reservoir area[J]. Road Machinery and Construction Mechanization, 2013, 30 (3): 48-50, 55. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-ZLJX201303036.htm -
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