土工合成材料土中拉伸试验研究  

In- soil Tensile Tests of Geosynthetics

作　　者：周萍[1] 徐超[1] 李丹 吴迪[1] 

机构地区：[1]同济大学岩土与地下工程教育部重点试验室,上海200092 [2]上海申元岩土有限公司,上海200040

出　　处：《佳木斯大学学报（自然科学版）》2014年第5期675-678,682,共5页Journal of Jiamusi University：Natural Science Edition

摘　　要：本文中进行了不同类型土工合成材料空气中拉伸、土中拉伸和侧限拉伸的对比试验,并考虑了拉伸速率对材料土中拉伸性能的影响.试验结果表明:土中拉伸时土或法向应力的侧限作用使材料的拉伸割线模量明显提高,特别是对于结构蓬松、延伸率高的无纺土工织物,在土中拉伸时刚度成倍增大;与常规空气中拉伸相比,土中抗拉强度变化不大,但土中拉伸时达到抗拉强度的材料伸长量明显减小;塑料土工格栅的拉伸强度和拉伸模量随拉伸速率的增大而增大,但增长率则随着拉伸速率增大而变缓.最后分析了加筋土结构滑动区中的筋土的相互作用,探讨了加筋材料在土中拉伸对土压力计算可能产生的影响.The tensile tests of different geosynthetics were carried out under three modes （ in air, in soil and confined condition under normal stress only ） in this paper.Besides, the effect of tensile rate on the in -soil tensile mechanical properties of geosynthetics was also considered .Test results show that the secant tensile stiff-ness is obviously increased in -soil and confined tests , especially for non -woven geotextiles with fleeciness structure and high extensibility;and the tensile strength and the secant tensile stiffness also increase with the ten -sile rate.Meanwhile the growth rate will decrease with the increase of tensile rate .Moreover, the soil-geosyn-thetics interaction in the active zone of reinforced soil wall was analyzed , and whether the in -soil tensile of rein-forcing material affects the calculation of earth pressure was discussed .

关 键 词：土工合成材料 土中拉伸试验 法向应力 拉伸速率 割线模量 

分 类 号：TU443[建筑科学—岩土工程]