冻融作用对土体物理力学性质影响研究进展
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摘要
冻融作用是强风化作用,显著改变土物理、力学性质,影响寒区构筑物安全性和耐久性。通过比对分析冻融后土的物理性质和力学性质,表明试验材料和方法是试验结果差异主要成因,尤以孔隙率和内摩擦角差异性最显著。在解决工程实际问题时,应结合实际气象资料确定温度控制模式,采用模型比尺选取温度变化范围和速率,与实际气温变化吻合。由于土体冻融过程复杂性,开敞和封闭系统下冻融过程对土体物理性质、力学性质影响差异显著。
Freezing and thawing cycle could make a great change on the physical and mechanical properties of the soil. As strong weathering which will affect the safety and durability of the structure. The following conclusions were drawn by summarizing the results of previous experiments and making contrastive analysis on the physical and mechanical properties of the soil after the freezing and thawing cycle. The main reason of different results were attributed to the different test materials and methods,especially the porosity and internal friction angle. In solving engineering problems, the confirmation of temperature control mode and the range and rate of temperature were based on the actual meteorological data and the model scale respectively, which consisted with the actual condition. Meanwhile, the model had a higher credibility in the actual project. Due to the complexity of the soil freezing and thawing process, the difference of the physical and mechanical properties under the open and closed systems should be attention.
Freezing and thawing cycle could make a great change on the physical and mechanical properties of the soil. As strong weathering which will affect the safety and durability of the structure. The following conclusions were drawn by summarizing the results of previous experiments and making contrastive analysis on the physical and mechanical properties of the soil after the freezing and thawing cycle. The main reason of different results were attributed to the different test materials and methods,especially the porosity and internal friction angle. In solving engineering problems, the confirmation of temperature control mode and the range and rate of temperature were based on the actual meteorological data and the model scale respectively, which consisted with the actual condition. Meanwhile, the model had a higher credibility in the actual project. Due to the complexity of the soil freezing and thawing process, the difference of the physical and mechanical properties under the open and closed systems should be attention.
引文
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[21]李宁,陈波,陈飞熊.寒区复合地基的温度场、水分场与变形场三场耦合模型[J].土木工程学报,2003,36(10):66-71.
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[24]谷宪明,王海波,梁士忠,等.季冻区路基土水分迁移数值模拟分析[J].公路交通科技:应用技术版,2007(9):51-54.
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[26]徐爽,郭颖.冻融作用下地基土水分迁移试验研究[J].山西建筑,2016,42(24):56-57.
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[29]杨更社,高宇璠,田俊峰,等.冻融循环对黄土电阻率及水分迁移影响的试验研究[J].科学技术与工程,2016,16(35):267-272.
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