考虑膨胀作用对抗剪强度影响的膨胀土边坡稳定性分析

doi:10.13722/j.cnki.jrme.2021.0869

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Abstract Swelling is one of the key factors affecting the stability of expansive soil slope. At present，the assumption of expansive force is insufficient and the mechanism is not clear when analyzing the stability of expansive soil slope. In response to these problems，the multidirectional swelling under specific constraints and its influence on shear strength are being considerd based on the Morgenstern-Price limit equilibrium method，and a project is taken as an example to illustrate the calculated process，which also is used to analysis the influence of swelling and residual shear strength on the stability of expansive soil slope. The results of the study presented in this paper show that constrained condition play a significant effect on the swelling pressure，which will be markedly reduced when there is a micro gap. The calculated swelling pressure of the slope presents a“trapezoidal”distribution，which transform the shear strength into residual strength when it causes the swelling strain exceeds the critical strain，and there is a critical swelling pressure，which makes the stability coefficient of the expansive soil slope suddenly change. The residual shear strength has dual effects on the stability of expansive soil slope，on the one hand，which affects the position with respect to the junction of residual and non residual area，and the other is the direct impact as a mechanical parameter for slope stability calculation. The research of the study are provided for reference for further improving the calculated theory of expansive soil slope stability and carrying out the research on corresponding engineering prevention measures.

Key words： slope engineering swelling shear strength slope stability constrained condition the critical strain

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	HE Weiming1
	2
	SHI Shengwei1
	2
	CAI Qiang1
	2
	LIANG Jiong1
	2

Cite this article:

HE Weiming1,2,SHI Shengwei1, et al. Stability analysis of expansive soil slope considering the influence of swelling on shear strength[J]. , 2022, 41(S2): 3524-3533.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0869 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/IS2/3524

[1] SHI B，JIANG H T，LIU Z B，et al. Engineering geological characteristics of expansive soils in china[J]. Engineering Geology，2002，67：63–71. [2] 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 Zhanlin，LI Qingyun，GUO Xiling，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)) [3] 徐丹，唐朝生，冷挺，等. 干湿循环对非饱和膨胀土抗剪强度影响的试验研究[J]. 地学前缘，2018，25(1)：286–296.(XU Dan，TANG Chaosheng，LENG Ting，et al. Shear strength of unsaturated expansive soil during wetting-drying cycles[J]. Earth Science Frontiers，2018，25(1)：286–296.(in Chinese)) [4] 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 Heping，WANG Xingzheng，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)) [5] ZHANG L T，NG C W W. Shear strength characteristics of an unsaturated expansive clay[J]. Canadian Geotechnical Journal，2006，43(7)：751–763. [6] 叶为民，刘樟荣，崔玉军，等. 膨润土膨胀力时程曲线的形态特征及其模拟[J]. 岩土工程学报，2020，42(1)：29–36.(YE Weimin，LIU Zhangrong，CUI Yujun，et al. Features and modelling of time- evolution curves of swelling pressure of bentonite[J]. Chinese Journal of Geotechnical Engineering，2020，42(1)：29–36.(in Chinese)) [7] 陈永贵，雷俊，贾灵艳，等. 圆饼状高压实膨润土膨胀力各向异性特征研究[J]. 土木工程学报，2019，52(1)：99–107.(CHEN Yonggui，LEI Jun，JIA Lingyan，et al. Anisotropic characteristics of swelling pressure for compacted GMZ pie-shaped bentonite block[J]. China Civil Engineering Journal，2019，52(1)：99–107.(in Chinese)) [8] ESTABRAGH A R，PARSAEI B，JAVADI A A. Laboratory investigation of the effect of cyclic wetting and drying on the behaviour of an expansive soil[J]. Soils and Foundations，2015，55(2)：304–314. [9] TANAKA Y，WATANABE Y. Modelling the effects of test conditions on the measured swelling pressure of compacted bentonite[J]. Soils and Foundations，2019，59(1)：136–150. [10] 吴珺华，杨松. 滤纸法测定干湿循环下膨胀土基质吸力变化规律[J]. 农业工程学报，2017，33(15)：126–132.(WU Junhua，YANG Song. Changes of matric suction in expansive soil under drying- wetting cycles using filter paper method[J]. Transactions of the Chinese Society of Agricultural Engineering，2017，33(15)：126–132.(in Chinese)) [11] 周葆春，孔令伟，陈伟，等. 荆门膨胀土土–水特征曲线特征参数分析与非饱和抗剪强度预测[J]. 岩石力学与工程学报，2010，29(5)：1 052–1 059.(ZHOU Baochun，KONG Lingwei，CHEN Wei，et al. Analysis of characteristic parameters of soil-water characteristic curve(SWCC) and unsaturated shear strength prediction of Jingmen expansive soil[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(5)：1 052–1 059.(in Chinese)) [12] FATTAH M Y，AL-LAMI A H S. Behavior and characteristics of compacted expansive unsaturated bentonite-sand mixture[J]. Journal of Rock Mechanics and Geotechnical Engineering，2016，8(5)：629–639. [13] 曹玲，王志俭，张振华. 降雨–蒸发条件下膨胀土裂隙演化特征试验研究[J]. 岩石力学与工程学报，2016，35(2)：413–421.(CAO Ling，WANG Zhijian，ZHANG Zhenhua. Experimental research of cracking process of expansive soil under rainfall infiltration and evaporation[J]. Chinese Journal of Rock Mechanics and Engineering，2016，35(2)：413–421.(in Chinese)) [14] 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 Shiji，YANG Zhenbei，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)) [15] JOSHI R P，KATTI R K. Lateral pressure development under surcharges[C]// Proceedings of the 4th international conference on expansive soils. SNETHEN D ed. New York：ASCE，1980：227–241. [16] OFER Z. Laboratory instrument for measuring lateral soil pressure and swelling pressure[J]. Geotechnical Testing Journal，1981，4(4)：177–182. [17] 谢云，陈正汉，孙树国，等. 重塑膨胀土的三向膨胀力试验研究[J]. 岩土力学，2007，28(8)：1 636–1 642.(XIE Yun，CHEN Zhenghan，SUN Shuguo，et al. Test research on three-dimensional swelling pressure of remolded expansive clay[J]. Rock and Soil Mechanics，2007，28(8)：1 636–1 642.(in Chinese)) [18] 杨文琦，周成，王林，等. 降雨作用下考虑膨胀推力的膨胀土边坡稳定性分析[J]. 防灾减灾工程学报，2018，38(5)：880–886.(YANG Wenqi，ZHOU Cheng，WANG Lin，et al. Stability analysis of an expansive soil slope under rainfall using the thrust method[J]. Journal of Disaster Prevention and Mitigation Engineering，2018，38(5)：880–886.(in Chinese)) [19] 肖世国. 膨胀土堑坡稳定性分析[J]. 岩土力学，2001，22(2)：152–155.(XIAO Shiguo. Stability analysis of expansive clay slope[J]. Rock and Soil Mechanics，2001，22(2)：152–155.(in Chinese)) [20] 孙即超，王光谦，董希斌，等. 膨胀土膨胀模型及其反演[J]. 岩土力学，2007，28(10)：2 055–2 059.(SUN Jichao，WANG Guangqian，DONG Xibin，et al. Expansive model and black analysis of expansive soils[J]. Rock and Soil Mechanics，2007，28(10)：2 055–2 059.(in Chinese)) [21] 中华人民共和国国家标准编写组. GB/T 50123—2019土工试验方法标准[S]. 北京：中国计划出版社，2019.(The National Standards Compilation Group of People?s Republic of China. GB/T 50123—2019 Standard for geotechnical testing method[S]. Beijing：China Planning Press，2019.(in Chinese)) [22] MORGENSTERN N R，PRICE V E. The analysis of the stability of general slip surfaces[J]. Géotechnique，1965，15(1)：79–93. [23] VANAPALLI S K，FREDLUND D G，PUFAHL D E. Model for the prediction of shear strength with respect to soil suction[J]. Canadian Geotechnical Journal，1996，33(3)：379–392. [24] 杨庆，张慧珍，栾茂田. 非饱和膨胀土抗剪强度的试验研究[J]. 岩石力学与工程学报，2004，23(3)：420–425.(YANG Qing，ZHANG Huizhen，LUAN Maotian. Testing study on shear strength of unsaturated expansive soil[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(3)：420–425.(in Chinese)) [25] 陈祖煜. 土质边坡稳定分析——原理?方法?程序[M]. 北京：中国水利水电出版社，2003：23–29.(CHEN Zuyu. Soil slope stability analysis—theory，methods and programs[M]. Beijing：China Water Power Press，2003：23–29.(in Chinese)) [26] FREDLUND D G，XING A. Equations for the soil-water characteristic curve[J]. Canadian Geotechnical Journal，1994，31(4)：521–532. [27] FREDLUND D G，MORGENSTERN N R. Constitutive relations for volume change in unsaturated soils[J]. Canadian Geotechnical Journal，1976，13(3)：261–276. [28] ADEM H H，VANAPALLI S K. Elasticity moduli of expansive soils from dimensional analysis[J]. Geotechnical Research，2014，1(2)： 60–72. [29] OH W T，VANAPALLI S K，PUPPALA A J. Semi-empirical model for the prediction of modulus of elasticity for unsaturated soils[J]. Canadian Geotechnical Journal，2009，46 (8)：903–914.