期刊
SOILS AND FOUNDATIONS
卷 58, 期 6, 页码 1326-1338出版社
JAPANESE GEOTECHNICAL SOC
DOI: 10.1016/j.sandf.2018.07.010
关键词
Temperature effects; Undrained shear; Critical state line; Thermal expansion
资金
- National Natural Science Foundation of China [51678094, 51509024]
- China Postdoctoral Science Foundation [2016M590864]
- US National Science Foundation [CMMI 1054190]
The effect of temperature on the shearing response of saturated, dense sand was investigated using a series of temperature-controlled, isotropically-consolidated, hollow cylinder triaxial compression tests, where specimens were heated in drained conditions followed by shearing in undrained conditions. As expected, the deviatoric stress at the peak state (i.e., the undrained shear strength) was observed to increase with increasing initial mean effective stress. However, it was observed to decrease linearly with increasing temperature. The effects of temperature on the deviatoric stress at the peak state were attributed to a linear increase in the magnitude of negative shear-induced pore water pressure at the peak state with temperature. The relationship between the undrained shear strength and the pore water pressure with changes in temperature was represented well by linear equations. When the shear strength was interpreted in terms of the critical state, no obvious changes in the critical state line in the p' - q plane were observed, and the critical state friction angle was unaffected by temperature. During drained heating, the dense sand specimens were observed to expand volumetrically, causing the normal consolidation line in the e - (p' / p(a))(0.5) plane to shift upward with increasing temperature without a change in the slope. The negative pore water pressure during undrained shearing caused the state paths of the dense sand specimens to move to the right. As the magnitude of negative pore water pressure increased with increasing temperature, no obvious effects on the critical state line in the e - (p' / p(a))(0.5) plane were observed. (C) 2018 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.
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