中国寒区粗粒土力学研究现状与进展
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TU431 P642.3

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国家自然科学基金重点项目(41730640),国家自然科学基金项目(41772325),西安工业大学科研启动基金项目(0853-302020610)


Review and Prospects of Coarse-grained soil Mechanics in Cold Regions of China
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The State Key Program ofNational Natural Scicnce of China(41730640), The National Natural Science Foundation of China (41772325 ), The Fondation of Xi’an Technological University (0853-302020610)

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    摘要:

    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。在查阅大量国内外文献的基础上,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,得出如下结论:通过引入不同新理论建立了考虑剪胀性、颗粒破碎性、非线性和冻融效应等粗粒土特殊性的本构模型;明确了粗粒土的基本物理性质、水理性、热物理和电学特性;基于大型直剪试验、大型三轴试验、数值模拟以及理论分析等手段深入研究了不同因素水平和应力条件下常温和冻融粗粒土的抗剪强度、变形规律以及作用机制;探讨了粗粒土-结构界面、冻-融界面的剪切力学特性及其与斜坡稳定性的关系;并且,针对目前研究现状,对寒区粗粒土力学特性研究进行展望分析。

    Abstract:

    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.

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屈永龙,倪万魁,牛富俊,等. 中国寒区粗粒土力学研究现状与进展[J]. 科学技术与工程, 2022, 22(8): 2979-2992.
Qu Yonglong, Ni Wankui, Niu Fujun, et al. Review and Prospects of Coarse-grained soil Mechanics in Cold Regions of China[J]. Science Technology and Engineering,2022,22(8):2979-2992.

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  • 收稿日期:2021-06-13
  • 最后修改日期:2022-02-22
  • 录用日期:2021-11-16
  • 在线发布日期: 2022-03-21
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