土工格室加筋路堤边坡离心模型试验研究  

Test Research on Centrifugal Model of Re-inforced Geo-grid Embankment Slope

作　　者：邹静蓉[1] 杨忠[2] 郑国荣[2] 李志勇[3] 

机构地区：[1]湖南交通职业技术学院,湖南长沙410004 [2]湖南省高速公路管理局,湖南长沙410016 [3]湖南省交通科学研究院,湖南长沙410015

出　　处：《公路工程》2007年第5期5-9,28,共6页Highway Engineering

基　　金：国家自然科学基金资助项目(50578060)

摘　　要：以边坡高度12 m,坡度为1∶0.75,共铺设土工格室20层,层厚为0.6 m的某二级公路为原型路堤,设计和制作了9组土工格室加筋和1组未加土工格室边坡相似模型,对土工格室加筋边坡变形和破坏力学机理进行了离心模型试验研究。在试验加载过程中,采用位移传感器测量坡顶的变形,通过摄影照相记录边坡破坏全过程。试验发现,土工格室加筋边坡破坏过程可划分为变形、开裂、局部剪切塑性变形和破坏四个阶段。土工格室加筋边坡的破坏模式表现为加筋区的整体破坏,并与未加筋区有明显的分界线。加大格室高度与层厚比和提高格室长度与坡高之比有利于增加边坡的稳定性,但存在一个临界值。填料强度对土工格室加筋边坡的影响十分突出,边坡坡度对其稳定性的影响则不大。Regard some Class II highway as the prototype embankment, Its height ot side stope is 12 m, the slope is 1： 0.75, lay the geogrids on 20 stories altogether, it is 0.6m that storey is thick, design and make the similar model of slope that contain 9 groups geogrids - reinforced and 1 group that not added muscle , the geogrids-reinforced slope deformation and destroying mechanics mechanism have carried on the centrifuge model tests. While the test loads , adopt the displacement sensor measurement out of the deformation of the slope top , and write down the whole course that the slope destroys through the photography video. Test find that geogrids-reinforced slope destroy course can divide out of shape , fracture , some shear plastic strain and failure 4 stages, the destruction mode of the geogrids-reinforced slope is shown as the whole destruction with the muscle district, and there is obvious boundary line with that not added muscle district . Strengthen the ratio of geogrids height and storey thickness and improve the ratio of geogrids length and slope height is help to increase stability of slope, but a critical value exists. Packing intensity add to geotechnological doses of room influence of slope very outstanding by the muscle, slope break degree have a little effect on its stability.

关 键 词：陡坡路堤 土工格栅 有限元 试验测试 水平位移与沉降 

分 类 号：U416.03[交通运输工程—道路与铁道工程]