Unloading Triaxial Experimental Study on Stress Path of Excavated Soil Slope

Abstract:

The current research was implemented to study the practical unloading stress path that the slope mass experienced during the excavation process, which is very important in the stress and strain numerical analysis. Series of unloading tests were carried out under different confining pressure. During the test process, the minor principal stress was kept decreasing, while the major principal stress was kept unchanged to simulate the stress path in some locations of the soil slope, such as at the top of the slope. The corresponding conventional triaxial compression tests were also carried out as comparison. It is shown that there are many differences between the unloading and loading tests. Through analyzing, the tests results could be applied in the development of unloading constitutive models of excavation soil mass. Also, such unloading tests data are valuable in calibration and verification of the current existing popularly used models.

• Periodical: Advanced Materials Research (Volumes 243-249)
• Pages: 2797-2801
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.243-249.2797
• Online since: May 2011
• Authors: Yan Gang Zhang, Kun Yong Zhang, Wang Lin Li, Qiao Zhen Shi
• Keywords: Stress Path, Triaxial Experiment, Unloading

References

[1] Abelev A V and Lade P V. (2003). "Effects of Cross Anisotropy on Three-Dimensional Behavior of Sand. I: Stress-Strain Behavior and Shear Banding". Journal of Engineering Mechanics, 2003, 129(2): 160-166.

DOI: 10.1061/(asce)0733-9399(2003)129:2(160)

[2] Lade P V and Duncan J M. (1973) "Cubical Triaxial Tests on Cohesionless Soil". Journal of the Soil Mechanics and Foundations Division, Vol. 99 (SM10): 793-812.

DOI: 10.1061/jsfeaq.0001934

[3] Lambe T W. (1967) "Stress path method". Soil Mech and Found Div. ASCE, Vol.93 (6): 268-277.

[4] Lane P, Griffiths. D. (2000). "Assessment of stability of slopes under drawdown conditions." J Geotech Geoenviron Eng ASCE Vol. 126(5):443-450.

DOI: 10.1061/(asce)1090-0241(2000)126:5(443)

[5] Matsuok. H., Nakai. T. (1974). "Stress-deformation and strength characteristics of soil under three different principal stresses". Proc. Japan Soc. Civil Engrs. [S.l.]: 59-70.

DOI: 10.2208/jscej1969.1974.232_59

[6] Zhang Kunyong, Yin Zongze (2007). "Discussion on soil anisotropy under complicated stress state and the study method". Chinese Journal of Rock and Soil Mechanics, Vol. 28(Supp.1): 149-154.

[7] Zhou Dunyun (2003). "Experimental research on deformation of foundation pit soil". Journal of Shandong University of Architecture and Engineering. Vol.18(4):15-18.