摘要
为真实反映土工带加筋碎石土的受力特性,本文采用实际工程中使用的TG玻塑土工带进行了4组不同围压、不同 加筋层数的土工带加筋碎石土大型三轴试验。分析了加筋带对碎石土应力-应变关系及强度的影响,并引入应力比、强度 加筋系数、破坏变形加筋系数、轴向变形加筋系数和侧向变形加筋系数来评价加筋效果。试验结果表明:碎石土经土工带 加筋后其破坏强度和破坏应变均得到提高,在大变形下土工带加筋碎石土仍能继续承担荷载。加筋土和未加筋土的强度 曲线基本平行,土工带加筋碎石土的强度服从"准粘聚力"原理。加筋效果不仅与加筋参数有关,而且与围压有关,加筋带 的作用发挥随围压增大而减小。
In order to reveal the properties of geobelt reinforced gravel cushion under load, four groups of large-scale triaxial tests had been carried out for 3 groups of geobelt reinforced gravel with different reinforced layers and 1 group of pure gravel under different ambience pressure. The effects of reinforcing geobelt on stress-strain relationship and strength of gravel soil are analyzed. The reinforcement effect is valued by introducing the following 5 parameters, namely stress ratio, reinforcement coefficient of strength, reinforcement coefficient of failure deformation, reinforcement coefficient of axial strain and reinforcement coefficient of lateral strain. The experimental results showed that both the failure strength and failure strain of gravel are increased by geobelt reinforcement. The geobelt reinforced gravel can still bear load under large deformation. The curves of strength of reinforced and non-reinforced soil are almost parallel. The mechanism of geobelt reinforced cushion gravel obeys the principle of quasi-cohesion. Reinforcement effect has relationship not only with reinforcement parameter but also with ambience pressures, the effect of the reinforced belt decreases as the ambience pressure increases.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2005年第2期124-128,共5页
Journal of Building Structures
基金
山西省归国留学生资助项目(2002-18)山西省自然科学基金资助项目(20041061)
