不同路径下土体单向冻胀过程力与变形试验研究

doi:10.13722/j.cnki.jrme.2018.1249

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摘要为探讨不同路径下土体冻胀过程中力与变形的发展规律，采用现有及改进的试验设备进行室内单向冻胀试验。考虑到约束力会对未冻土产生压缩变形，故通过不同荷载作用下的融土压缩试验拟合出合理的换算公式，并将这种关系运用到冻胀试验结果分析中。在冻胀试验过程中，实时监测温度、力以及位移的变化，同时观察试样外观表象并在试验结束后分层测取含水量。通过分析冻结过程各变量之间的关系，间接证明约束力抑制冻胀的内在机制是抑制了水分迁移；而冻胀过程中约束力与约束率之间的关系受路径的影响不显著，坐标点由上下两条边缘线包络而形成带状分布区域，上边缘线为最安全关系曲线；此外亦可依据冻胀规律反演不同路径下力与变形随时间发展的近似过程。本试验结果或可对冻土区地基的设计和管道与冻土相互作用研究提供理论指导和建议。

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	黄龙1
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	盛煜1
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	何彬彬1
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	张玺彦1
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关键词 ：土力学, 冻胀, 变形, 不同路径, 约束力, 约束率

Abstract：Based on the existing and improved test equipments，a unidirectional frost heaving test was carried out in the laboratory in order to explore the regularity of force and deformation in the process of frost heaving under different paths. Considering that the constraint force will cause a compression deformation of the unfrozen soil，therefore，a series of conversion formulas were fitted through a group of compression tests of thawed soil under different loads，and then these formulas were applied to the results analysis of the frost heaving test. During the frost heaving test，the variables including temperature，force and displacement were monitored，the appearance of soil samples were observed in real time，and the water contents by layers were measured after the test. Through the analysis of the relationships among those variables during freezing，it was proved indirectly that the mechanism of constraint force to restrain the frost heaving was to restrain the water migration actually. The relationship between constraint forces and constraint rates affected by the path was not significantly，the coordinate points were enveloped by the upper and lower edge lines and presented a zonal distribution，while the upper edge line was the safest curve. In addition，the variation of forces and deformations under different paths can also be inverted according to the regularity of frost heaving. The results of this experiment can provide a theoretical guidance and proposal for the design of foundation in permafrost regions and for the study of interaction between pipes and frozen soil.

Key words： soil mechanics frost heave deformation different paths constraint force constraint rate

引用本文:

黄龙1，2，盛煜1，黄旭斌1，2，何彬彬1，2，张玺彦1，2. 不同路径下土体单向冻胀过程力与变形试验研究[J]. 岩石力学与工程学报, 2019, 38(S2): 3870-3882.
HUANG Long1，2，SHENG Yu1，HUANG Xubin1，2，HE Binbin1，2，ZHANG Xiyan1，2. Experimental study on force and deformation of soil during unidirectional frost heaving under different paths. , 2019, 38(S2): 3870-3882.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2018.1249 或 http://rockmech.whrsm.ac.cn/CN/Y2019/V38/IS2/3870

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