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。
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 frosts heave deformation in winter,and the high-altitude slope of coarse-grained soil collapses 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 were 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 new constitutive models of coarse-grained soil considering the dilatancy,particle breakage,nonlinearity and freeze-thaw effect were established by introducing different new theories.In-depth research was 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 were studied systematically.These studies were 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 were deeply discussed.Finally,according to the current research status,the study prospect on the mechanical properties of coarse-grained soil in cold regions was analyzed.
作者
屈永龙
倪万魁
牛富俊
穆彦虎
张猛
金鑫
QU Yong-long;NI Wan-kui;NIU Fu-jun;MU Yan-hu;ZHANG Meng;JIN Xin(School of Civil and Architecture Engineering, Xi’an Technological University, Xi'an 710021, China;College of Geology Engineering and Geomatics, Chang'an University, Xi'an 710054, China;State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China)
出处
《科学技术与工程》
北大核心
2022年第8期2979-2992,共14页
Science Technology and Engineering
基金
国家自然科学基金重点项目(41730640)
国家自然科学基金(41772325)
陕西省自然科学基础研究计划项目(2022JQ-443)。
关键词
寒冷地区
粗粒土
本构模型
力学性质
界面特性
cold regions
coarse-grained soils
constitutive model
mechanical properties
interface features
作者简介
第一作者:屈永龙(1988-),男,汉族,陕西洛川人,博士,讲师,研究方向:寒区特殊土力学与工程,E-mail:quyl2018@163.com。
