中国寒区粗粒土力学研究现状与进展

在寒冷地区,粗粒土是路基、土石坝等工程主要填料,也在高寒山区斜坡上广泛分布.寒区高铁路基冬季冻胀病害和高海拔斜坡春季滑塌灾害等的防治与评价,均与冻融作用下粗粒土的力学特性密切相关.在查阅大量中外文献的基础上,从本构关系、物理特性、力学性质和界面问题等方面对寒区粗粒土力学理论的研究现状进行综述.通过引入不同新理论建立了考...

Review and Prospects of Coarse-grained soil Mechanics in Cold Regions of China

In cold regions, coarse-grained soil is the main filler for subgrade, earth-rock dam and other projects, and is also widely distributed on slopes in alpine regions. The subgrade of high-speed railway in cold region has frost heave deformation in winter, and the high-altitude slope of coarse-grained soil has collapsed in spring. The prevention and evaluation of disasters are closely related to the mechanical properties of coarse-grained soil under freezing and thawing. Therefore, a large number of domestic and foreign documents had been consulted. The research status of coarse-grained soil mechanics in cold regions was reviewed from the aspects of constitutive relations, physical properties, mechanical properties and interface problems. The results show that new constitutive models of coarse-grained soil considering the dilatancy, particle breakage, nonlinearity and freeze-thaw effect have been established by introducing different new theories. In-depth research has been carried out on the basic physical properties, water-physical properties, thermophysical and electrical properties of coarse-grained soils in cold regions. Then, the shear strength, deformation law and factor action mechanism of coarse-grained soil under different factor levels, stress conditions and temperatures are studied systematically. These studies are carried out through research methods such as large-scale direct shear test, large-scale triaxial compression test, numerical simulation and theoretical analysis. The shear properties of coarse-grained soil-structure interface, freeze-thaw interface and their relationships with the slope stability are deeply discussed. Finally, according to the current research status, the study prospect on the mechanical properties of coarse-grained soil in cold regions is analyzed.