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Cylindrical cavity expansion responses in anisotropic unsaturated soils under plane stress condition

Journal of Rock Mechanics and Geotechnical Engineering 2022年第6期14卷 1989-2002页

作者： Haohua Chen Xiaolin Weng Lele Hou Dean Sun Department of Geotechnical Engineering Tongji UniversityShanghai200092China Department of Civil and Architectural Engineering and Mechanics University of ArizonaTucsonAZ85721USA School of Highway Chang’an UniversityXi’an710064China Department of Civil Engineering Shanghai UniversityShanghai200444China

In this paper,an anisotropic critical state model for saturated soils was extended to unsaturated conditions by introducing suction into its yield *** this model with soil-water characteristic curves related to porosity ratio was employed to characterize the coupled hydromechanical behavior of unsaturated anisotropic *** on the plane stress condition,the problem of the cylindrical cavity expansion in unsaturated anisotropic soils was transformed into first-order differential equations using the Lagrangian *** equations were solved as an initial value problem using the Runge-Kutta algorithm,which can reflect the soil-water retention behavior during cavity *** analyses were conducted to investigate the influences of overconsolidation ratio(OCR),suction,and degree of saturation on the expansion responses of a cylindrical cavity in unsaturated anisotropic soil under plane stress *** results show that the above factors have obvious influences on the cavity responses,and the plane strain solution tends to overestimate expansion pressure and degree of saturation but underestimates suction around the cavity compared to the proposed plane stress *** theoretical model proposed in this paper provides a reasonable and effective method for simulating pile installation and soil pressure gauge tests near the ground surface of the unsaturated soils.

关键词： Cylindrical cavity anisotropic unsaturated soil Plane stress Hydromechanical behavior

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