摘要
通过三轴试验方法研究土工格栅加筋土的强度及变形破坏特性,探论了在不同加筋情况下,土工格栅加筋土强度影响因素及其变化规律,分析了素土和土工格栅加筋土的变形破坏形式及筋材在土体抗剪破坏过程中的变形机理。试验结果表明:(1)加筋后土体的强度和抵抗变形的能力明显增强。(2)在加筋层数一定的情况下,随着围压的增加加筋土强度明显增强,加筋效果显著增加。(3)在围压一定的情况下,随着加筋层数的增加加筋土强度增强,加筋效果显著增加。(4)对于强度加筋效果系数和规格化强度分析发现,在中围压下,加筋土加筋效果最合理最有效。(5)土工格栅加筋土应力应变关系采用固结围压作为归一化因子进行处理可得到一个统一的数学表达,即归一化公式,具有很好的归一化特性。本研究结果对于深入研究土工格栅加筋土加固机理和加筋土工程具有指导意义。
The characteristics of strength and deformation of geogrid reinforced soil were studied with the triaxial test and the influence factors and change law of the geogrid reinforced soil were researched under different reinforced conditions, the failure modes of plain soil and geogrid reinforced soil as well as the deformation mechanism of geosynthetics during the shearing process were analyzed. The results show that： （ 1 ） the strength and anti-deformation capacity of the soil are intensified obviously as the soil is reinforced ; （2） the strength of the reinforced soil increases significantly with the increases of confining pressure when the reinforced layers are decided ; （ 3 ） the strength of the reinforced soil increases obviously with the increase of reinforced layers when the confining pressure is decided; （4） the analyzed results of the coefficient of reinforced effect and normalized strength detects that the reinforcement effect of soil is the most reasonable and most effective under the middle confining pressure ; （5） a normalized formula, which possess a good characteristic of normalization is found, while the consolidation confining pressure is selected as the normalized factor to describe the stress-strain relationship of the geogrid reinforced soil . The test results provide a good guiding significance for the study on the reinforcement mechanism of geogrid reinforced soil and the engineering with reinforced technique.
出处
《建筑科学》
北大核心
2013年第3期64-69,共6页
Building Science
基金
黑龙江省教育厅科学技术研究项目资助(项目编号:12511566)
佳木斯市社会科学重点科研项目资助(项目编号:11 135)
佳木斯大学科学技术研究项目资助(项目编号:L2011-032)
关键词
三轴试验
土工格栅
加筋土
强度
变形破坏
triaxial test
geogrid
reinforced soil
strength
deformation and failure
