土工格栅在青藏铁路多年冻土区的应用

从土工格栅的工作原理出发,分析了在多年冻土区特殊路基中土工格栅加固过程.通过土工格栅在青藏铁路五道梁地区的应用实例,结合现场变形温度的监测,认为土工格栅对减小路基的沉降影响不大,但能有效地减小侧向变形,从而有效地减小纵向裂纹.采用商业数值计算软件ABAQUS,引入接触单元,模拟青藏铁路五道梁地区的加筋路基的温度、变形过程.数值模拟结果与实际测得的结果吻合,说明土工格栅在青藏铁路应用的合理性.

Application of Geogrid in Permafrost Embankment of Qinghai-Tibet Railway

From the operating principle of the geogrid,the reinforcement process is recommended in embankment of the permafrost area.Through the field monitoring in the Wudaoliang reinforced embankment,it is found that the influence of geogrid is tiny on settlement,but is obvious on lateral deformation in permafrost area,which results in the decreasing of the longitudinal fissures.By introducing contact pairs,the process of temperature and deformation are calculated through ABAQUS software.The results from numerical analysis is consistent with the field monitoring,which proves it is reasonable to apply geogrid to permafrost area embankment.