陆嘉楠, 徐洁, 陈永辉. Experimental Study of Temperature Effects on Consolidation and Strength Properties of Silty Clay[J]. 2017, 37(4): 598-603. DOI: 10.13409/j.cnki.jdpme.2017.04.014.
Experimental Study of Temperature Effects on Consolidation and Strength Properties of Silty Clay
摘要
随着能源岩土工程的发展
温度对土体固结和强度特性的作用变得越来越重要。采用温控三轴仪
通过等温增压固结试验、等压升温固结试验和温控三轴剪切试验
研究温度对饱和粉质黏土固结和强度特性的影响。结果表明
温度越高
土体固结速率越快
固结体应变越大。不同温度下试样的正常固结线几乎平行。同一围压作用下
温度越高
孔隙比越低。热应力造成的固结体应变随温度升高呈线性增长。剪切过程中
轴向应变较小时
同样偏应力作用下
温度越高
轴向应变越小;而轴向应变较大时
趋势相反。试样破坏偏应力随温度升高而线性减小
且围压越大
温度效应越明显。有效粘聚力c′随温度升高而减小
而有效内摩擦角φ′则不受温度的影响。
Abstract
With the development of geo-energy engineering
temperature effects on consolidation and strength properties of soil become more and more important. Temperature-controlled triaxial apparatus are adopted to study the temperature effects on consolidation and strength properties of a silty clay by consolidation tests with increasing confining pressure under constant temperature
consolidation tests with increasing temperature under constant confining pressure and temperature-controlled triaxial compression tests. Test results show that consolidation rate is faster and consolidation volumetric strain is larger at a higher temperature. The normal consolidation lines under different temperatures are almost parallel to each other. Under the same confining pressure
void ratio is lower at a higher temperature. Consolidation volumetric strain induced by thermal stress increases linearly with increasing temperature. During shearing
the axial strain is higher at a higher temperature for the same deviator stress at low axial strains
while the trend is opposite at high axial strains. Deviator stress at failure decreases linearly with increasing temperature. The temperature effects are more significant at a higher confining pressure. Effective cohesion c’ decreases with increasing temperature
while effective friction angle φ’ is not affected by temperature.
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