寒旱环境灌木根系增强春融期边坡稳定性影响  

Effects of Shrub Roots in Cold and Arid Environment on Enhancing Slope Stability during Spring Thaw

作　　者：高英 马艳霞[2] 张吾渝[2] 张小荣 杨丰华 GAO Ying;MA Yan-xia;ZHANG Wu-yu;ZHANG Xiao-rong;YANG Feng-hua(Department of Civil and Architectural Engineering,Xi an Jiaotong University City College,Xi an 710018,China;College of Civil Engineering,Qinghai University,Xining 810016,China;Qinghai Provincial Transportation Planning and Design Research Institute Co.,Ltd.,Xining 810000,China)

机构地区：[1]西安交通大学城市学院土木建筑工程系,西安710018 [2]青海大学土木工程学院,西宁810016 [3]青海省交通规划设计研究院有限公司,西宁810000

出　　处：《科学技术与工程》2024年第12期5096-5103,共8页Science Technology and Engineering

基　　金：陕西省自然科学基础研究计划项目(2021JQ-892);陕西省教育厅计划项目(23JK0524);西安交通大学城市学院校级潜力培育项目(2023PY08)。

摘　　要：春融期边坡极易发生热融滑塌现象,为研究植被根系与边坡冻融界面呈不同夹角α条件下边坡的潜在滑移面破坏形式、位移特征以及稳定性影响。结果表明:随融化深度的增加,春融期素土及根-土复合体边坡的等效塑性应变贯通带越明显,易沿着冻融界面发生平面状滑塌;相比于素土边坡,春融期(3月份)根-土复合体边坡最大位移量减小约69.65%,春融期(4月份)根-土复合体边坡最大位移量减小约71.88%,且根-土复合体边坡位移的减少量随着α角的增大而呈增大趋势,表现出根系伸入冻融界面处时具有较强的固土能力;当根系与冻融界面夹角α由45°增大至90°时,根-土复合体边坡的安全系数呈增长趋势,且根系与边坡冻融界面垂直时,根系具有相对最大限度地增强春融期边坡固土护坡作用,可有效提高春融期边坡的稳定性。研究成果为探讨冻融界面处植物根系对春融期边坡稳定性具有理论研究价值和实际指导意义。In order to study the potential slip surface damage form,displacement characteristics and stability effects of slopes under different angleαbetween vegetation root system and slope freeze-thaw interface.The results show that with the increase of thawing depth,the equivalent plastic strain penetration zone of plain soil and root-soil composite slopes during spring thawing period is more obvious and prone to plane slip along the freeze-thaw interface.Compared with plain soil slopes,the maximum displacement of root-soil composite slopes during spring thawing period(March)is reduced by about 69.65%,and the maximum displacement of root-soil composite slopes during spring thawing period(April)is reduced by about 71.88%.The maximum displacement of the root-soil composite slope is reduced by about 69.65%in the spring thawing period(March)and 71.88%in the spring thawing period(April),and the reduction of the displacement of the root-soil composite slope tends to increase with the increase ofαangle,which shows that the root system has strong soil consolidation ability when it reaches the freeze-thaw interface.When the angleαbetween the root system and the freeze-thaw interface is increased from 45°to 90°,the root-soil composite slope is more susceptible to planar sliding along the freeze-thaw interface.When the angle between the root system and the freeze-thaw interface is increased from 45°to 90°,the safety coefficient of the slope of root-soil complex tends to increase,and when the root system is perpendicular to the freeze-thaw interface of the slope,the root system has a relatively maximum effect of enhancing the soil consolidation and slope protection of the slope during the spring-thaw period,which can effectively improve the stability of the slope during the spring-thaw period.The research results have theoretical research value and practical guidance significance for the discussion of plant roots at the freeze-thaw interface on the stability of spring thaw slopes.

关 键 词：根-土复合体 水热力耦合 冻融界面 边坡稳定性 

分 类 号：TU444[建筑科学—岩土工程]