Experimental study on unsaturated creep characteristics of landslide soils
LAI Xiao-ling1, YE Wei-min1, WANG Shi-mei2
1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University , Shanghai 200092, China; 2. Key Laboratory of Geological Hazards in Three Gorges Reservoir Area of Ministry of Education, China Three Gorges University, Yichang 443002, China
Abstract：Under the impacts of reservoir water level fluctuation and rainfall, the strength and deformation of slope soils, on the one hand, have features of properties of unsaturated soils; on the other hand, they exhibit time-dependent behaviour s. Therefore, it is indispensable to investigate the time-dependent behaviours of unsaturated soils to better account for the long-term stability of slopes under the effects of water. A series of suction-controlled triaxial creep tests on sliding zone soils of some landslides in Three Gorges Reservoir Area are performed. Creep curves with different values of deviator stresses and matric suctions are presented and discussed. The test results indicate that the creep strain as well as the creep strain rate at constant deviator stress increases gradually with the decrease of the matric suction. Moreover, for the increasing values of the deviator stress, a wider variation of the creep strain as well as the creep strain with suction is obtained. Then, the Mesri creep model for experimental creep strain with different suction values is established. In the model, a hyperbolic function is adopted for the stress-strain relationship and a power function for the strain-time relationship. Finally, an expression for the relationship between the suction and the initial tangent modulus <>Ed is derived. Based on this, a model of stress-suction-strain-time of specimens is developed. The comaprative results indicate that predicted results using the model are in reasonable agreement with the experimental data .
赖小玲, 叶为民, 王世梅. 滑坡滑带土非饱和蠕变特性试验研究[J]. 岩土工程学报, 2012, 34(2): 286-293.
LAI Xiao-ling, YE Wei-min, WANG Shi-mei. Experimental study on unsaturated creep characteristics of landslide soils. Chinese J. Geot. Eng., 2012, 34(2): 286-293.
[1] 孙广忠 . 中国典型滑坡 [M]. 北京 : 科学出版社 , 1998. (SUN Guang-zhong. Typical landslides in China[M]. Beijing: Science Press, 1998. (in Chinese)) [2] Wang F, Zhang Y M, Huo Z T, et al. Mechanism for the rapid motion of the Qianjiangping landslide during reactivation by the first impoundment of the Three Gorges Dam reservoir, China[J]. Landslides, 2008, 5 : 379 – 386. [3] Li D Y, Yin K L, Leo C. Analysis of Baishuihe landslide influenced by the effects of reservoir water and rainfall[J]. Environmental Earth Sciences, 2010, 60 : 677 – 687. [4] Jian W X, Wang Z J, Yin K L. Mechanism of the Anlesi landslide in the Three Gorges Reservoir, China[J]. Engineering Geology, 2009, 108 : 86 – 95. [5] Fredlund D G, Rahardjo H. Soil mechanics for unsaturated soil[M]. New York: John Wiley and Sons, 1993. [6] Pytharouli S I, Stiros S C . Kinematics and rheology of a major landslide based on signal analysis[J]. Geotechnique, 2010, 60 : 207 – 222. [7] Bai J G, Lu S D, Han J S . Importance of study of creep sliding mechanism to prevention and treatment of reservoir landslide[C]// Proceedings of the 10th International Symposium on Landslides and Engineered Slopes. Xi'an, 2008, 1&2 : 1071 – 1076. [8] 谭万鹏 , 郑颖人 , 王 凯 . 考虑蠕变特性的滑坡稳定状态分析研究 [J]. 岩土工程学报， 2010, 32 ( 增刊 2): 5 – 8. ( tan w an-peng, zheng y ing-ren, wang k ai. Stable state of landslides considering creep properties[J]. Chinese Journal of Geotechnical Engineering, 2010, 32 (S2): 5 – 8. (in Chinese)) [9] Bishop A W, Lovenbury H T . Creep characteristics of two undisturbed clays [C]// Proc 7th ICSMFE. Mexico, 1969, 1: 29 – 37. [10] Vaid Y P, Campanella R G . Time-dependent behavior of undisturbed clay[J]. J Geotech Eng, 1977, 103 (7): 693 – 709. [11] Augustesen A, Liingaard M, Lade P V . Evaluation of time-dependent behavior of soils[J]. Int J Geomech, 2004, 4 (3): 137 – 156. [12] Liingaard M, Augustesen A, Lade P V . Characterization of models for time-dependent behavior of soils [J] . Int J Geomech, 2004, 4 (3): 157 – 177. [13] 王 琛 , 张永丽 , 刘浩吾 . 三峡泄滩滑坡滑动带土的改进 Singh-Mitchell 蠕变方程 [J]. 岩土力学 , 2005, 26 (3): 415 – 418. ( WANG Chen, ZHANG Yong-li, LIU Hao-wu. A modified Singh-Mitchell’s creep function of sliding zone soils of Xietan landslide in Three Gorges[J]. Rock and Soil Mechanics, 2005, 26 (3): 415 – 418. (in Chinese)) [14] Mesri G, Castro A . <>Ca/<>Cc concept and <>K0 during secondary compression[J]. J Geotech Engng, ASCE, 1987, 113 (3): 230 – 247. [15] Charles J A . Laboratory compression tests and the deformation of rockfill structures[J]. NATO ASI Series E, 1991, 200 : 73 – 95. [16] Athanasiu C, Simonsen A S, Soereide O K, et al. Elastic and creep settlements of rock fills[C]// Proc 16th Int Conf Soil Mech Geotech Engng. Osaka, 2005: 1837 – 1843. [17] Charles J A . Geotechnical properties of coarse grained soils[C]// Proc of 12th Int Conf Soil Mech Found Engng, Rio de Janeiro, 1989, General Report, Discussion Session 8. 1989: 2495 – 2519. [18] Singh A, Mitchell J K . General stress-strain-time function for soils[J]. Journal of Soil Mechanics and Found Engineering Division, ASCE, 1968, 94 (1): 21 – 46. [19] Mesri G, Rebres-Cordero E, Shields D R . Shear stress-strain-time behavior of clays[J]. Geotechnique, 1981: 31 (4): 537 – 552. [20] Li J Z, Peng F L, Xu L S, et al. Viscous properties of clay with different water content[C]// Proceedings of Sessions of GeoShanghai. Shanghai, 2006, 194 : 55 – 61. [21] HUANG X L, LIU J J, YANG C H, et al. Experimental investigation of Daqing Oilfield mudstone’s creep characteristic under different water contents[J]. J Cent South Univ Technol, 2008, 15 (S1): 471 – 474. [22] Kierzkowski P . Oedometer creep tests of a partially saturated kaolinite clay[C]// Proceedings of 2nd International Conference on Mechanics of Unsaturated Soils. Weimar: Bauhaus Univ Weimar, 2007, 112 : 301 – 307. [23] Schwarz V, Becher A, Vrettos C. An initial study on the viscous behaviour of a partially saturated kaolinite clay based on triaxil tests[C]// Proceedings of the Fourth International Conference on Unsaturated Soils , Carefree, 2006. [24] De Gennaro V, Delage P, Cui Y J, et al. Time-dependent behavior of oil reservoir chalk: a multiphase approach[J]. Soils and Foundations, 2003, 43 (4): 131 – 147. [25] Priol G, De Gennaro V, Delage P . Experimental investigation on the time dependent behaviour of a multiphase chalk [C]// Proceedings of 2nd International Conference on Mechanics of Unsaturated Soils. Weimar: Bauhaus Univ Weimar, 2007, 112 : 161 – 167. [26] Alonso E E, Gens A, Josa A. A constitutive model for partially saturated soils[J]. Geotechnique, 1990, 40 (3): 405 – 430. [27] Perzyna P. The constitutive equations for rate sensitive plastic materials[J]. Quart Appl Mech, 1964, 20 : 321 – 332. [28] Hoxha D, Homand F, AUVRAY Ch. Deformation of natural gypsum rock: Mechanisms and questions[J]. Engineering Geology, 2006, 86 : 1 – 17. [29] Oldecop L A, Alonso E E . Theoretical investigation of the time-dependent behaviour of rockfill[J]. Geotechnique, 2007, 57 (3): 289 – 301. [30] 关 倪 , 王世梅 . 非饱和土蠕变试验方法探讨 [J] . 三峡大学学报 , 2008, 30 (2): 32 – 34. (GUAN Li,WANG Shi-mei. Discussion on creep test methods of unsaturated soil[J]. Journal of Three Gorges University, 2008, 30 (2): 32 – 34. (in Chinese)) [31] Lin H D, Wang C C . Stress-strain-time function of clay[J]. Journal of Geotechnical and Geoenvironmental Engineering, 1998, 124 (4): 289 – 296. [32] Janbu N . Soil compressibility as determined by oedometer and triaxial tests [C]// Proceedings of European Conference on Soil Mechanics and Foundation Engineering. Wiesbaden, 1963, 1 : 19 – 25.
