Abstract
The cutting slopes in soft rock of redbed appeared in Yichang-Badong highway often suffer from the instability along weak intercalations, so the creep behaviors of weak intercalated soils are crucially important for the stability of cutting slopes. Because the deformation of weak intercalated soils is significantly affected by water content due to the strong water sensitivity, it is necessary to study the influence of matric suction on the creep behaviors of weak intercalated soils. In order to find out the unsaturated creep characters of weak intercalated soils, a GDS unsaturated triaxial apparatus was used. Then the triaxial creep experiments on weak intercalated soil samples under varying matric suction were conducted to obtain the unsaturated creep curves. The results show that the weak intercalated soils have obvious creep behaviors, and the creep strain is in nonlinear relationship with stress and time. When the matric suction is constant, a larger deviator stress will lead to a larger creep strain; When the deviator stress is constant, a smaller matric suction will lead to a larger creep strain. Based on the Mesri creep model, an improved creep model for weak intercalated soils under varying matric suction was established, in which the relationship of stress-strain was expressed with a hyperbolic function, and the relationship of strain-time was expressed with power functions in stages. Then an unsaturated creep model including stress-matric suction-strain-time for weak intercalated soils was established based on the power function relationship between matric suction and E d (a parameter of the improved creep model). The comparison of the calculated values of creep model and the experimental values shows that the creep behaviors of weak intercalated soils can be predicted by the unsaturated creep model by and large.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Alonso EE, Gens A, Josa A (1990) A constitutive model for partially saturated soils. Geotechnique 40: 405–430. DOI: 10.1680/geot.1990.40.3.405
Augustesen A, Liingaard M, Lade PV (2004). Evaluation of time-dependent behavior of soils. International Journal of Geomechanics 4: 137–156. DOI: org/10.1061/(ASCE)1532-3641(2004)4:3(137)
Bishop AW, Lovenbury HT (1969) Creep characteristics of two undisturbed clays. Proc 7th ICSMFE. Mexico 1: 29–37.
Bob CC (1987) Rheologic theory of soil mechanics. DU Yupei, trans. Science Press, Beijing, China: 297–342. (In Chinese).
Charles JA (1989) Geotechnical properties of coarse grained soils. Proceedings of 12th International Conference Soil Mechanics and Foundation Engineering, Rio de Janeiro, General Report, Discussion Session 8: 2495–2519.
Cheng HT (2005) Experimental study on the deformation characteristics of unsaturated loess. Chang’an university, Xi’an, China. (In Chinese).
Cheng Q, Zhou DP, Feng ZJ (2009) Research on shear creep property of typical weak intercalation in redbed soft rock. Chinese Journal of Rock Mechanics and Engineering 28(S1): 3176–3180. DOI: 10.3321/j.issn:1000-6915.2009.z1.087
Janbu N (1963) Soil compressibility as determined by oedometer and triaxial tests. Proceedings of European Conference on Soil Mechanics and Foundation Engineering. Wiesbaden 1: 19–25.
Kierzkowski P (2007) Oedometer creep tests of a partially saturated kaolinite clay.Proceedings of 2nd International Conference on Mechanics of Unsaturated Soils. Weimar: Bauhaus Univ Weimar 112: 301–307.
Lai XL, Liu Y, Qin HB (2009) Unsaturated creep Model of the sliding zone soils of Qianjiangping landslide in three gorges. Disaster and Control Engineering 1: 41–46.
Lai XL, Ye WM, Wang SM (2012) Experimental study on unsaturated creep characteristics of landslide soils. Chinese Journal of Geotechnical Engineering 34: 286–293. DOI: 1000-4548(2012)02-0286-08
Li K, Kang WF (1983) Creep testing of thin interbedded clayey seamsin rockand determination of their longterm strength. Rock and Soil Mechanics 4: 39–45.
Liingaard M, Augustesen A, Lade PV (2004) Characterization of models for time-dependent behavior of soils. International Journal of Geomechanics 4: 157–177. DOI: 10.1007/(ASCE)1532-3641(2004)
Lin HD, Wang CC (1998) Stress-strain-time function of clay. Journal of Geotechnical and Geoenvironmental Engineering 124: 289–296. DOI: 10.1061/(ASCE)1090-0241
MA Ke (2012) Hefei unsaturated expansive soil creep test and model research. Anhui construction industry institute. Hefei, China. (In Chinese)
Mesri G, Rebres-Cordero E, Shields DR (1981) Shear stressstrain-time behavior of clays. Geotechnique 31: 537–552. DOI: 10.1680/geot.1981.31.4.537
Ng CWW, Zhan LT, Cui YJ (2002) A new simple system for measuring volume changes in unsaturated soils. Canadian Geotechnical Journal 39: 757–764. DOI: 10.1139/t02-015
Oldecop LA, Alonso EE (2007) Theoretical investigation of the time-dependent behaviour of rockfill. Geotechnique 57: 289–301. DOI: 10.1680/geot.2007.57.3.289
Priol G, De Gennaro V, Delage P (2007) Experimental investigation on the time dependent behaviour of a multiphase chalk. Proceedings of 2nd International Conference on Mechanics of Unsaturated Soils. Weimar: Bauhaus Univ Weimar 112: 161–167.
Schwarz V, Becher A, Vrettos C (2006) An initial study on the viscous behaviour of a partially saturated kaolinite clay based on triaxil tests. Proceedings of the Fourth International Conference on Unsaturated Soils, Carefree.
Singh A, Mitchell JK (1968) General stress-strain-time function for soils. Journal of Soil Mechanics and Found Engineering Division, ASCE 94: 21–46.
Tan TK Kang WF (1991) On the locked in stress, creep and dilatation of rocks and the constitutive equations. Chinese Journal of Rock Mechanics and Engineering 4: 299–312.
Vaid YP, Campanella RG (1977) Time-dependent behavior of undisturbed clay. Journal of Geotechnical and Geoenvironmental Engineering 103: 693–709.
Wang C, Liu HW, Xu Q (2004) Modified Mesri Creep Model for Soils in Sliding Zone of Xietan Landslide in the Three Gorges. Journal of southwest jiaotong university 39: 15–19. DOI: 10.3969/j.issn.0258-2724.2004.01.004
Wang C, Zhang YL, Liu HW (2005). A modified Singh-Mitchell’s creep function of sliding zone soils of Xietan landslide in Three Gorges. Rock and Soil Mechanics 26: 415–418. DOI: 10.3969/j.issn.1000-7598.2005.03.015
Wang ZJ, Yin KL, Jian WX (2007) Experimental research on creep of incompetent beds in Jurassic red clastic rocks in Wanzhou. Rock and Soil Mechanics 28(S1): 40–44. DOI: 1000-7598-(2007)S-0040-05
Xiao HB, Xu H, Teng K, et al. (2009) Experimental study on One-dimensional compression creep characteristics for unsaturated remodeling expansive Soil. Highway Engineering 36(6): 1–7. DOI: 10.3969/j.issn.1674-0610.2009.06.001
Yang TH, Rui YQ, Zhu WC, et al. (2008) Rheological characteristics and long-Term strenth of siltized intercalation interbeded in Peat mudstonel. Journal of Experimental Mechanics 23: 398–402. DOI: 1001-4888(2008)05-0396-07
Zhan LT (2003) Field and laboratory study of an unsaturated expansive soil associated with rain-induced slope instability. The Hong Kong University of Science and Technology, Hong Kong, China. (In Chinese).
Zhan LT, Ng CWW (2006) Experimental study on mechanical behavior of re-compacted unsaturated expansive clay. Chinese Journal of Geotechnical Engineering 28: 196–201. DOI: 10.3321/j.issn:1000-4548.2006.02.010
Zhang QH, Peng GZ (1997) Research on creep behavior of the week intercalated bed in the dangerous rock body of Lianzi Cliff. Rock and Soil Mechanics 18: 60–64.
Author information
Authors and Affiliations
Corresponding author
Additional information
http://orcid.org/0000-0001-7542-0454
http://orcid.org/0000-0002-4986-2344
Rights and permissions
About this article
Cite this article
Zhu, YB., Yu, HM. Unsaturated creep behaviors of weak intercalated soils in soft rock of Badong formation. J. Mt. Sci. 12, 1460–1470 (2015). https://doi.org/10.1007/s11629-014-3298-4
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11629-014-3298-4