土工合成材料加筋工粘接性能试验研究与数值模拟分析  

Experimental Study and Numerical Simulation Analysis of Geosynthetics Reinforced Bond Performance

作　　者：杨楠 于明鑫[1] 岳川云 冯颖 YANG Nan;YU Ming-xin;YUE Chuan-yun;FENG Ying(Department of Civil Engineering,Shenyang Urban Construction University,Shenyang Liaoning 110167,China;Liaoning Zhongce Building Technology Co.,Ltd.,Shenyang Liaoning 110027,China)

机构地区：[1]沈阳城市建设学院土木工程系,辽宁沈阳110167 [2]辽宁中测建筑科技有限公司,辽宁沈阳110027

出　　处：《粘接》2020年第10期22-25,共4页Adhesion

摘　　要：在实验室里研究土木合成材料加筋工粘接性能的测试常常都是采用固结排水三轴剪切的实验进行研究,所涉及的性能有粘结土的应力、强度和体变这3个方面。从实验的结果我们便不难发现,若是要增大高压压实度土体的体积的稳定性就得通过加筋的方式进行,但是通过加筋的方式会使得土体的剪胀体变有所降低,而土体的剪缩体却不会有所降低或升高。实验采用的试件有加筋试件和素土试件,这两者最大的区别是轴向应变,当轴向的应变低的时候加筋试件低于素土试件的强度,素土试件慢慢高于加筋试件,这就要轴向应变增大到一定的程度,这也存在加筋对土体强度有推迟的现象,这也随着筋材的加筋层数和拉伸模量的增多,这种推迟的现象也会表现的尤为明显。在实验中通过改变加筋的层数和筋材的拉伸模量来控制土体的峰值强度,实验表明随着加筋层数的增大,这也使得土体的峰值强度在一定的范围内是有所增大的,但是一旦过了峰值,再通过改变加筋的层数对于增强土体的峰值强度就不会有多大的改变性,除了通过改变加筋的层数,还可以通过改变拉伸模量的筋材来控制土体残余强度,使得土体的应力应变的特性也会有较大的改变。In the laboratory,the test of bond performance of civil composite reinforcement is usually carried out by consolidation drainage triaxial shear test,which involves three aspects:the stress,strength and volume change of cohesive soil.From the experimental results,it is not difficult to find that if we want to increase the volume stability of the high-pressure compaction soil,the method of reinforcement must be carried out,but through the way of reinforcement,the shear swelling body of the soil will be reduced,while the shear shrinkage body of the soil will not be reduced or increased.The test pieces used in the experiment are reinforced specimen and plain soil specimen.The biggest difference between them is the axial strain.When the axial strain is low,the reinforced specimen is lower than the strength of plain soil specimen,and the plain soil specimen is slowly higher than the reinforced specimen,which requires the axial strain to increase to a certain extent,which also has the phenomenon that the reinforcement delays the soil strength.With the increase in the number of reinforced layers and tensile modulus of the reinforcement,this delay phenomenon will also be particularly obvious.In the experiment,the peak strength of the soil is controlled by changing the number of layers of reinforcement and the tensile modulus of reinforcement.The experiment shows that with the increase of the number of layers of reinforcement,the peak strength of the soil is increased in a certain range,but once the peak value is exceeded,the peak strength of the soil will not be greatly changed by changing the number of layers of reinforcement,except through by changing the number of reinforcement layers,the residual strength of soil can be controlled by changing the reinforcement material of tensile modulus,so that the stress-strain characteristics of soil will be greatly changed.

关 键 词：土工合成材料 粘接性能 数值模拟分析 

分 类 号：U412.22[交通运输工程—道路与铁道工程] TG491[金属学及工艺—焊接]