Influence of the thermal effect on quasi-static shear characteristics of calcareous soil: an experimental study
Tóm tắt
In principle, the mechanical properties of soil particles are irreversibly changed after particles are subjected to heating. Accordingly, this study performed ring-shear tests on calcareous sand samples subjected to high temperatures to qualitatively investigate the influence exerted by the degradation of the calcareous sand, caused by the thermal effect, on the large displacement shear characteristics of the samples. The effects of the shear velocity and normal stress on the quasi-static shear behavior of the calcareous sand samples were analyzed. The influence of the thermal effect on the quasi-static shear flow behavior of the samples is primarily reflected in the change in the particle mineral composition, particle hardness, and sample density. These variations result in changes in the shear strength, residual shear stress, macroscopic friction coefficient, and other shear characteristics of the calcareous sand samples. Both the shear velocity and the high temperature affect the fluctuation amplitude of the residual shear stress. The results have great theoretical and practical significance in terms of explaining the instability mechanism of a slope. Moreover, a feasible and effective technique is proposed to investigate the large-displacement shear behavior of soil subjected to the thermal effect exerted by a long-runout landslide.
Tài liệu tham khảo
Agung MW, Sassa K, Fukuoka H et al (2004) Evolution of shear-zone structure in undrained ring-shear tests. Landslide 1(1):101–112
Forterre Y (2008) Flows of dense granular media. Annu Rev Fluid Mech 40:1–24
Hong Y, Sun T, Luan MT et al (2009) Development and application of geotechnical ring shear apparatus: an overview. Rock Soil Mech 30(3):628–634 (In Chinese)
Hu W, Huang RQ, McSaveney M et al (2018) Mineral changes quantify frictional heating during a large low-friction landslide. Geology 46(3):223–226
Hu W, Huang RQ, McSaveney M et al (2019) Superheated steam, hot CO2 and dynamic recrystallization from frictional heat jointly lubricated a giant landslide: field and experimental evidence. Earth Planet Sci Lett 510:85–93
Huang Y, Dai ZL (2014) Large displacement and failure simulations for geo-disasters using smoothed particle hydrodynamics method. Eng Geol 168:86–97
Hungr O (1995) A model for the runout analysis of rapid flow slides, debris flows, and avalanches. Can Geotech J 32(4):610–623
Johnson KL (1970) The correlation of indentation experiments. J Mech Phys Solids 18(2):115–126
Kamai T (1998) Monitoring the process of ground failure in repeated landslides and associated stability assessments. Eng Geol 50(1):101–112
Luo Y, He SM, Song PF (2016) Research status and prospects of thermo-poro-mechanical analysis of long runout landslides motions. J Catastrophol 31(4):162–165
Ma SL, Shimamoto T, Yao L et al (2014) A rotary-shear low to high-velocity friction apparatus in Beijing to study rock friction at plate to seismic slip rates. Earthq Sci 27(5):469–497
Noda H, Kanagawa K, Hirose T et al (2011) Frictional experiments of dolerite at intermediate slip rates with controlled temperature: Rate weakening or temperature weakening? J Geophys Res 116:B07306
Pinyol NM, Alvarado M, Alonso EE et al (2018) Thermal effects in landslide mobility. Geotechnique 68(6):528–545
Shimamoto T, Tsutsumi A (1994) A new rotary-shear high-speed frictional testing machine: its basic degign and scope of research. J Tecton Res Group Jpn 39:65–78
Skempton AW (1985) Residual strength of clays in landslides, folded strata and the laboratory. Geotechnique 35(1):3–18
Smith SAF, Di Toro G, Kim S et al (2013) Coseismic recrystallization during shallow earthquake slip. Geology 41:63–66
Sun QC, Wang GQ (2008) Review on granular flow dynamics and its discrete element method. Adv Mech 38(1):87–100
Tika TE, Hutchinson JN (1999) Ring shear tests on soil from the Vaiont landslide. Geotechnique 49(1):59–74
Ujiie K, Tanaka H, Saito T et al (2013) Low coseismic shear stress on the Tohoku-oki megathrust determined from laboratory experiments. Science 242:1211–1214
Uzuoka R, Yashima A, Kawakami T et al (1998) Fluid dynamics based prediction of liquefaction induced lateral spreading. Comput Geotech 22(3–4):243–282
Wang YY (2006) An approach to rheological characters of viscous debris flow and the stress constitutie. J Mt Sci 24(5):555–561 (In Chinese)
Wang SR, Huang Y (2022a) Experimental study on the effect of particle size on the shear characteristics of large-displacement soil exposed to heat treatment: shear fluctuation and heat degradation. Eng Geol 300:106581
Wang SR, Huang Y (2022b) Experimental study on the shear characteristics of quartz sand exposed to high temperatures. Acta Geotech 17:5031–5041
Xu Q, Li WL, Dong XJ (2017) The Xinmocun landslide on June 24, 2017 in Maoxian, Sichuan: characteristics and failure mechanism. Chin J Rock Mech Eng 36(11):2612–2628