高土堤加筋土工格栅受力状态及滑坡分析*

为研究高土堤加筋土工格栅受力状态与滑坡的关系，建立Midas GTX NX三维模型和数据监测站，通过数据监测验证模型静力分析的准确性，理论分析高土堤加筋土工格栅受力状态以及滑坡的方向。基于分析结果，综合考虑土工格栅强度、土堤高度、填土厚度，提出判断滑坡方向的方法。研究结果表明:在实际设计中每个台阶的坡脚处最容易破坏，所以设计时每个台阶坡脚处土工格栅强度建议加强；土工格栅的受力状态决定土堤的滑坡方向和滑坡的趋势以及滑坡的破坏形态；传统的土堤设计为从上到下土工格栅的强度增大，但是通过受力云图和监测曲线，发现土堤边侧土工格栅的拉力也较大，所以在设计时土堤两侧的土工格栅强度也应适当增大。研究结果可为实际工程中高土堤加强部分的选择提供依据。

Analysis on stress state and landslide of high earth embankment reinforced geogrid

In order to study the relationship between the stress state of high earth embankment reinforced geogrid and landslide,a three-dimensional model of MIDAS GTX NX and a data monitoring station were established.The accuracy of static analysis of the model was verified by data monitoring,and the stress state of high earth embankment reinforced geogrid and the direction of landslide were analyzed theoretically.Based on the analysis results and comprehensively considering the strength of geogrid,the height of embankment and the thickness of fill,a method to judge the direction of landslide was put forward.The results showed that through the analysis,the toe of each step was most likely to be damaged in the actual design,so it was recommended to strengthen the geogrid strength at the toe of each step during design.The stress state of geogrid determined the landslide direction and tendency of the earth embankment,as well as the failure mode of landslide.In the traditional design of earth embankment,the strength of geogrid increased from top to bottom.However,it could be seen from the force cloud map and monitoring curve that the tension of geogrid at the side of earth embankment was also large,so the strength of geogrid on both sides of earth embankment should also increase appropriately during the design.The study provides a basis for the selection of strengthening part of high earth embankment in the project.