长丝纺黏与短纤针刺复合土工膜的蠕变特性及模型研究  

Creep Characteristics and Model Study of Composite Geomembrane with Filament Spunbonded and Short Fiber Needled

作　　者：李晓林 杨武[1,2] 何建新 LI Xiao-lin;YANG Wu;HE Jian-xin(College of Hydraulic and Civil Engineering,Xinjiang Agricultural University,Urumqi 830052,China;Xinjiang Key Laboratory of Hydraulic Engineering Security and Water Disasters Prevention,Urumqi 830052,China)

机构地区：[1]新疆农业大学水利与土木工程学院,乌鲁木齐830052 [2]新疆水利工程安全与水灾害防治重点实验室,乌鲁木齐830052

出　　处：《新疆农业大学学报》2023年第1期65-72,共8页Journal of Xinjiang Agricultural University

基　　金：新疆维吾尔自治区自然科学基金项目(2022D01B105)。

摘　　要：工程中常用的复合土工膜有长丝纺黏和短纤针刺两种,为探究二者蠕变特性的差异,开展了拉伸强度试验及不同应力水平(10%、20%、30%、40%、50%、60%、70%、80%)下的长期室内蠕变试验,对比分析了两种土工布类型对复合土工膜断裂强度、蠕变变形的影响,基于应力水平建立了可反映蠕变规律的经验模型与黏弹模型,并与实测值进行对比,论证了其合理性。结果表明,相同规格下长丝纺黏复合土工膜的断裂强度大于短纤针刺复合土工膜;在蠕变试验中,长丝纺黏复合土工膜的临界应力水平为30%,短纤针刺复合土工膜为40%;相同应力水平下长丝纺黏复合土工膜的蠕变变形小于短纤针刺复合土工膜,反映出其抵抗变形能力更强;两种复合土工膜的蠕变-时间关系曲线规律相同,采用对数函数经验模型和4参数黏弹模型均可准确地反映复合土工膜在不同时间及应力水平下的蠕变规律;同时,4参数黏弹模型中弹簧的弹性模量E1对蠕变的影响最为敏感。There are two kinds of composite geomembrane commonly used in engineering:filament spunbond and short fiber needled.In order to explore the difference of creep characteristics between them,tensile strength test and long-term indoor creep test under different stress levels(10%,20%,30%,40%,50%,60%,70%,80%)were carried out.The effects of two types of geotextiles on the fracture strength and creep deformation of composite geomembrane were compared and analyzed.Based on the stress level,an empirical model and a viscoelastic model reflecting the creep law were established,and compared with the measured values.Afterwards,the rationality was demonstrated.The results showed that the breaking strength of filament spunbonded composite geomembrane was greater than that of short fiber needled composite geomembrane under the same specifications.In the creep test,the critical stress level of the filament spunbonded composite geomembrane was 30%,and the short fiber needled composite geomembrane was 40%.Under the same stress level,the creep deformation of the filament spunbonded composite geomembrane was smaller than that of the short fiber needled composite geomembrane,reflecting its stronger resistance to deformation.The creep-time relationship curves of the two composite geomembranes were the same.The logarithmic function empirical model and the four-parameter viscoelastic model could accurately reflect the creep law of the composite geomembrane at different time and stress levels.At the same time,the elastic modulus E 1 of the spring in the four-parameter viscoelastic model was the most sensitive to creep.

关 键 词：复合土工膜 蠕变特性 经验模型 黏弹模型 

分 类 号：TV41[水利工程—水工结构工程]