高纬度多年冻土物理力学性质研究  

Study on Physical and Mechanical Properties of Permafrost at High Altitudes

作　　者：赵文美[1] 

机构地区：[1]黑龙江省公路勘察设计院,哈尔滨150040

出　　处：《森林工程》2015年第3期128-130,135,共4页Forest Engineering

基　　金：大庆油田建设集团科技项目"漠大线伴行路多年冻土地区路基及桥梁建设关键技术"

摘　　要：冻土具有相变性、流变性和蠕变性等特点,其工程性质异常复杂多变。为确保多年冻土地区公路路基的稳定性,就要了解地表下多年冻土的物理力学性质。依托《漠大线伴行路多年冻土地区路基及桥梁建设关键技术》项目,选取典型冻土路段对路基下多年冻土进行取样,通过室内土工试验分别测定冻土的总含水率、密度、颗粒分析、液塑限、比重、抗剪强度、抗压强度等指标,并对试验结果进行分析。得出:随着深度的增加冻土含水率呈现下降趋势,冻土的密度随着含水率的增加而减小;未冻水和冰对冻土抗剪强度影响显著,总含水率低的冻土抗剪强度高;富冰冻土总含水率超过土体饱和状态的含水率,冻土抗压强度随着总含水率增加而降低。进而为大兴安岭多年冻土地区修建公路和路基沉降变形病害分析提供可靠的理论参考。Permafrost has the characteristics of phase change, theological property, and creep characteristics and its engineering properties are extremely complex and various. In order to ensure the stability of highway embankment in permafrost region, it is neces- sary to understand the physical and mechanical properties of permafrost under the surface. In this paper, based on the project of Key Technology for Roadbed and Bridge Construction of Moda Road with Permafrost Area Project, typical sections of permafrost under the embankment of permafrost were selected, and permafrost total moisture content, bulk density, grain size analysis, liquid and plastic limit, soil specific gravity, shear strength, and compressive strength were determined through laboratory soil test, and the test results were analyzed. It is concluded that with the increase of depth of permafrost moisture content showed a trend of decline, and the bulk density of permafrost decreased with the increase of moisture content; Non-frozen water and ice had significant effects on the shear strength of permafrost, and the shear strength of permafrost with low total moisture content was high; the moisture content of ice-rich permafrost was more than that of saturated soil, the compressive strength of permafrost decreased as the total moisture content in- creased. The study has provided reliable theory references to construct roads in permafrost region and analysis on roadbed settlement deformation in the Daxing＇an Mountain range.

关 键 词：高纬度 多年冻土 物理性质 力学性质 

分 类 号：S773.3[农业科学—森林工程] U490[农业科学—林学]