Coupling effects of cyclic deviator stress and cyclic confining pressure on deformation behaviour of saturated clay
SUN Lei1, WANG Jun2, GU Chuan2, GUO Lin2
1. Coastal City and Geotechnical Engineering Research Center, Zhejiang University, Hangzhou 310058, China; 2. College of Civil Engineering and Architecture, Wenzhou University, Wenzhou 325035, China
Abstract：A series of partially drained cyclic triaxial tests under coupling of cyclic deviator and cyclic confining pressure are performed on typical Wenzhou soft clay by using GDS cyclic triaxial apparatus. The coupling effects of cyclic deviator and cyclic confining pressure on the partially drained cumulative plastic strain of saturated clay are studied. The experimental results show that under partially drained condition, compared to that of the conventional CCP tests, coupling of cyclic deviator stress and cyclic confining pressure expedites the accumulation of cumulative plastic strain with the increase of confining pressure amplitude, and the increase of the ratio of cyclic confining pressure to cyclic deviator stress of 2/3 will induce an increment of 32% in the cumulative plastic strain. On the basis of the experimental results obtained, an empirical formula incorporating the coupling effect of cyclic deviator stress and variable confining pressure is proposed to estimate the cumulative plastic strain in the partially drained cyclic tests.
孙磊, 王军, 谷川, 郭林. 循环偏应力和循环围压耦合效应对饱和软黏土变形特性的影响[J]. 岩土工程学报, 2015, 37(12): 2198-2204.
SUN Lei, WANG Jun, GU Chuan, GUO Lin. Coupling effects of cyclic deviator stress and cyclic confining pressure on deformation behaviour of saturated clay. Chinese J. Geot. Eng., 2015, 37(12): 2198-2204.
[1] SEED H B, MCNEILL R L. Soil deformation in normal compression and repeated loading test[J]. Highway Research Board Bulletin, 1956, 141: 44-53. [2] MONISMITH C L, OGAWA N, FREEME C R. Permanent deformation characteristics of subgrade soils due to repeated loading[J]. Transportation Research Record, 1975, 537: 1-17. [3] LI D, SELIG E T. Cumulative plastic deformation for fine-grained subgrade soils[J]. Journal of Geotechnical Engineering, 1996, 122(12): 1006-1013. [4] CHAI J C, MIURA N. Traffic-load-induced permanent deformation of road on soft subsoil[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2002, 128(11): 907-916. [5] 黄茂松, 李进军, 李兴照. 饱和软黏土的不排水循环累积变形特性[J]. 岩土工程学报, 2006, 28(7): 891-895. (HUANG Mao-song, LI Jing-jun, LI Xing-zhao. Cumulative deformation behaviour of soft clay in cyclic undrained tests[J]. Chinese Journal of Geotechnical Engineering, 2006, 28(7): 891-895. (in Chinese)) [6] 张 勇, 孔令伟, 郭爱国, 等. 循环荷载下饱和软黏土的累积塑性应变试验研究[J]. 岩土力学, 2009, 30(6): 1542-1548. (ZHANG Yong, KONG Ling-wei, GUO Ai-guo, et al. Cumulative plastic strain of saturated soft clay under cyclic loading[J]. Rock and Soil Mechanics, 2009, 30(6): 1542-1548. (in Chinese)) [7] LEKARP F, ISACSSON U, DAWSON A. State of the art I: resilient response of unbound aggregates[J]. Journal of Transportation Engineering, 2000, 126(1): 66-75. [8] 施明雄. 多向振动下砂土动力特性试验研究[D]. 杭州: 浙江大学, 2008. (SHI Ming-xiong. Sand response tomulti-way dynamic loading [D]. Hangzhou: Zhejiang University, 2005. (in Chinese)) [9] 陈存礼, 谢定义, 高 鹏. 球应力往返作用下饱和砂土变形特性的试验研究[J]. 岩石力学与工程学报, 2005, 24(3): 513-520. (CHEN Cun-li, XIE Ding-yi, GAO Peng. Testing study on deformation characteristics of saturated sand under repeated spherical stress[J]. Chinese Journal of Rock Mechanics and Engineering, 2005, 24(3): 513-520. (inChinese)) [10] RASCOL E. Cyclic properties of sand: dynamic behavior for seismic applications[D]. Lausanne: Swiss Federal Institute of Technology in Lausanne, 2009. [11] RONDON H A, WICHTMAN T, TRIANTAFYLLIDIS T, et al. Comparison of cyclic triaxial behaviour on unbound granular material under constant and variable confining pressure[J]. Journal of Transportation Engineering, ASCE 2009, 135(7): 467-478. [12] WHICHTMANN T, NIEMUNIS A, TRIANTAFYLLIDIS T H. On the influence of the polarization and the shape of the strain loop on strain accumulation in sand under high-cyclic loading[J]. Soil Dyn and Earthquake Eng, 2007, 27(1): 14-28. [13] SIMONSEN E, ISACSSON U. Soil behavior during freezing and thawing using variable and constant confining pressure triaxial tests[J]. Candian Geotechnical Journal, 2001, 38: 863-875. [14] ZAMAN M, CHEN D, LAGUROS J. Resilient moduli of granular materials[J]. J Transp Eng, 1994, 120(6): 967-988. [15] 周 健, 屠洪权, 安原一哉. 动力荷载作用下软黏土的残余变形计算模式[J]. 岩土力学, 1996, 17(1): 54-60. (ZHOU Jian, TU Hong-quan, YASWHARA K. A model for predicting the cyclic behaviour of soft clay [J]. Rock and Soil Mechanics, 1996, 17(1): 54-60. (in Chinese)) [16] 王常晶, 陈云敏. 交通荷载引起的静偏应力对饱和软黏土不排水循环性状影响的试验研究[J]. 岩土工程学报, 2007, 29(11): 1742-1747. (WANG Chang-jin, CHEN Yun-min. Study on effect of traffic loading induced static deviator stress on undrained cyclic properties of saturated soft clay[J]. Chinese Journal of Geotechnical Engineering, 2007, 29(11): 1742-1747. (in Chinese)) [17] MILLER G A, TEH S Y, LI D, et al. Cyclic shear strength of soft railroad subgrade[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2000, 126(2): 139-147. [18] SHAHU J T, YUDHBIR, KAMESWARA R N S V. A simple test methodology for soils under transportation routes[J]. Géotechnique, 1999, 49(5): 639-649. [19] 黄 博, 丁 浩, 陈云敏. 高速列车荷载作用的动三轴模拟[J]. 岩土工程学报, 2011, 33(2): 195-201. (HUANG Bo, DING Hao, CHEN Yun-min. Simulation of high-speed train load by dynamic tests[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(2): 195-201. (in Chinese)) [20] 谷 川, 王 军, 蔡袁强, 等. 考虑变围压因素的饱和软黏土循环纯压动力特性试验研究[J]. 岩土工程学报, 2013, 35(7): 1307-1315. (GU Chuan, WANG Jun, CAI Yuan-qiang, et al. Undrained dynamic behaviors of saturated clays under compressive stress paths considering cyclic confining pressure[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(7): 1307-1315. (in Chinese)) [21] 蒋 军, 陈龙珠. 长期循环荷载作用下黏土的一维沉降[J]. 岩土工程学报, 2001, 23(3): 366-369. (JIANG Jun, CHEN Long-zhu. One-dimensional settlement due to long-term cyclic loading[J]. Chinese Journal of Geotechnical Engineering, 2001, 23(3): 366-369. (in Chinese)) [22] SAKAI A, SAMANG L, MIURA N. Partially-drained cyclic behaviour and its application to the settlement of a low embankment road on silty-clay[J]. Soils and Foundations, 2003, 43(1): 33-46.
