土工带加筋碎石土大型三轴试验研究  

Experimental study on geobelt reinforced gravel by large-scale triaxial test

作　　者：黄仙枝[1,2] 白晓红[1] 

机构地区：[1]太原理工大学土木工程系 [2]山西大学工程学院,山西太原030013

出　　处：《建筑结构学报》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)

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.

关 键 词：加筋碎石土 土工带 试验研究 大型三轴试验 加筋效果 受力特性 应变关系 破坏变形 侧向变形 轴向变形 破坏应变 破坏强度 试验结果 强度曲线 加筋参数 加筋带 加筋土 围压 土应力 应力比 系数和 大变形 粘聚力 工程 层数 

分 类 号：TU411.7[建筑科学—岩土工程] TU411[建筑科学—土工工程]