GRS(Geosynthetic Reinforced Soil)结构是指加筋间距不超过30 cm、填料压实度超过95%的加筋土体;MSE(Mechanically Stabilized Earth)结构则是加筋间距相对较大的加筋土体,即目前工程中常用的加筋土结构。相比于MSE结构,GRS结构的加筋间距更小、压实度更高,一般表现出与MSE结构不同的受力机制和结构性能。通过模型试验,对比研究GRS结构和MSE结构在竖向沉降、侧向位移、筋材应变等方面的性能差异,以加深对这2种加筋土结构的认识。试验结果表明:GRS结构的侧向位移明显小于MSE结构,GRS结构中筋材的应变较小且分布更为均匀;这说明GRS结构与MSE结构在结构性能上确实存在明显的区别。此外,还将部分试验实测数据与相关计算评价方法的理论值进行了对比分析,发现适用于MSE结构的现有评价方法通常并不适用于GRS结构;这种评价方法上的差异进一步说明了GRS结构和MSE结构之间存在较大的差别,因此需在工程设计中引起注意并区别对待。
Abstract
GRS (Geosynthetic Reinforced Soil) Structures differ from MSE (Mechanically Stabilized Earth) structures in terms of force mechanism and structural performance. GRS structures are featured with smaller reinforcement spacing and higher compactness degree. The reinforcement spacing of GRS structure usually does not exceed 30 cm and the compactness degree is over 95%, while MSE structure which is commonly used in engineering is characterized by large reinforcement spacing. Through model tests, the behaviors of GRS and MSE structures are investigated and compared in aspects of vertical settlement, lateral displacement, and reinforcement strain. Test results reveal that GRS structures suffer from smaller lateral displacement and smaller yet more evenly-distributed strain of reinforcement than MSE structures, which further verifies the evident difference in structural performance between the two structures. In addition, theoretical analysis is also carried out in this study and theoretical calculation results are compared with some of the test results. The comparison demonstrates that current evaluation methods for MSE structures do not suit for GRS structures. In conclusion, such structural differences should be fully considered in engineering design.
关键词
加筋土 /
GRS结构 /
MSE结构 /
模型试验 /
性能差异 /
评价方法
Key words
reinforced soil /
Geosynthetic Reinforced Soil (GRS) structure /
Mechanically Stabilized Earth (MSE) structure /
model test /
differences in performance /
evaluation methods
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基金
政府间国际科技创新合作重点专项(2016YFE0105800);国家自然科学基金项目(41772284)
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