土工隔栅与土界面作用特性的试验研究  

Experimental Study on the Interface Characteristics between Geogrids and Soil

作　　者：张思峰[1] 宋修广[2] 

机构地区：[1]山东建筑大学土木工程学院,济南250101 [2]山东大学土建与水利学院,济南250061

出　　处：《建筑科学》2009年第3期28-31,共4页Building Science

基　　金：山东省交通厅资助项目(2005y002)

摘　　要：通过室内模型试验和现场测试的方法对路基工程中土工格栅与填土界面之间的相互作用特性进行了研究,分析了上覆荷载、层间厚度、压实度、埋设层数、埋设位置等因素对于格栅与土界面作用特性的影响规律。试验结果表明,随着上覆荷载的增大,界面拉应力基本呈线性增长,量值大约为竖向荷载的1/1000;在路堤中心线处的拉应力最大,往两侧逐渐减小;随层厚及压实度的增加,界面摩阻力逐渐增大,格栅界面作用逐渐增强。为保证土工格栅抗变形能力的充分发挥,实际工程中格栅的埋设应遵循"上疏下密"的原则。现场试验也表明,土工格栅有调整荷载分布的作用,对于减小路堤的不均匀沉降有明显的效果,从而对提高路基的稳定性能有较大作用。By adopting the method of indoor model experiments and field tests,the interface characteristic between geogrids and soil in roadbed engineering is studied.The influence regularity of some factors,such as the superjacent load, the interlaminar thickness of geogrids,the degree of compaction,the layer number and the embedded position on the interface characteristic between geogrids and soil is analyzed.The experiments results indicate that the interface tension stress develops in linearity with the increase of superjacent load,and the magnitude of the tension stress is about 1/1000 of superjacent load.In the meantime,the tension stress of geogrids located in roadbed center line is maximum,and the tension stress gradually decreases from the centre to both sides.Along with the increasing of interlaminar thickness of geogrids and the raising of degree of compaction of roadbed,the interface frictional resistance gradually increases,and the interface effects is gradually strengthened.To give full play to the distortion resistance ability of geogrids in actual engineering,the burying principle for geogrids should be followed： thin upper and dense lower form.The field tests also show that the geogrids have the function of adjusting load distribution,which has the obvious effect on reducing the inhomogeneous settlement of road embankment,as a result,to have greater function on improving the stability of road embankment.

关 键 词：界面特性 试验研究 土工格栅 影响因素 

分 类 号：U416.03[交通运输工程—道路与铁道工程] TU411.3[建筑科学—岩土工程]