经编格栅与不同填土界面作用特性试验研究  

Interaction Characteristics Between Warp Knitting Geogrid and Different Kinds of Soil

作　　者：魏军扬[1] 王保田[1] 张海霞[1,2] 赵波[1] 张静华 周斌 

机构地区：[1]河海大学土木与交通学院,江苏南京210098 [2]河海大学岩土工程水利部重点实验室,江苏南京210098 [3]扬州大学建工学院,江苏扬州225127 [4]上海斯耐迪工程咨询监理有限公司,上海200233

出　　处：《土木工程与管理学报》2013年第2期62-65,共4页Journal of Civil Engineering and Management

摘　　要：加筋土是一种由铺设在填土中抗拉强度较好的加筋材料和抗压强度较好填土组成的复合结构体系,具有高抗剪强度和一定的抗拉强度,是一种稳定性较好的挡土或护坡工程形态。加筋材料与填土间的界面特性在加筋土工程中是最关键的技术指标,对加筋土工程的稳定和安全有重大影响。本文选择粉土,粗砂两种填土与经编土工格栅分别进行室内拉拔试验来研究其界面作用特性。试验结果表明,经编土工格栅与填土界面的摩擦阻力并不完全随法向应力的增加而增加;经编土工格栅与填土界面间的强度包线由两段斜线组成,并不直接连接过度,存在法向应力突变区域;不同填土或相同填土具有不同含水率其突变区域均不同;在突变区域之前较低的法向应力作用下的摩擦角大于于突变区域之后,黏着力则相反。Reinforced earth is a kind of composite structure system composed by some reinforced material with a better tensile strength laying in the earth and some earth with a better compressive strength, owing a higher shear strength and some tensile strength, it is a retaining or slope protection engineering configuration with a good stability. In some reinforced earth engineerings, the interaction characteristics between reinforcement and soil has great influence on the stability and safety of reinforced earth engineering, it is the key index in the reinforced earth retaining wall design. In order to study the interaction characteristics between reinforcement and different soils, this paper choose two kinds of soil, silt and sand, and warp knitted geogrid to do pullout tests respectively. The test results show that the quantity of frictional resistance between warp knitting geogrid and soil increases with the normal stress increasing, but not absolutely; the interface strength curve of warp knitting geogrid and soil is not directly connected to transit, but consisted of two oblique lines, and has the normal stress mutant region ; different kinds of soils or the same soil with different water content can lead to different mutant regions; before the mutant region, under the lower normal stress condition, the friction angle is greater than under the adhesive force after the mutant region, but the cohesion is opposite.

关 键 词：经编土工格栅 拉拔试验 突变区域 摩擦阻力 摩擦角 黏着力 

分 类 号：TU472[建筑科学—结构工程]