酸性及碱性环境下土工格室加筋土结构力学性质

doi:10.6040/j.issn.1672-3961.0.2024.186

摘要/Abstract

摘要： 通过对酸、碱溶液浸泡后格室加筋土进行常规三轴试验,对试样破坏形态、土体填料基本物理参数进行测定分析。结合三轴试验取得的应力-应变曲线对格室加筋体的应力-应变响应模型进行验证,后采用固结排水三轴试验对酸碱环境下等效直径为0.34、0.45 m的格室加筋土应力-应变响应、表观黏聚力的变化进行研究分析。研究结果表明:经三轴试验取得格室加筋土邓肯-张模型参数应用于偏应力-轴向应变、体应变-轴向应变关系曲线与试验曲线几乎吻合,即推导公式计算结果符合试验测得的数据;应力-应变响应分析中,PET(polyethylene terephthalate)比PP(polypropylene)格室加筋土酸碱环境影响大,且PET材料两种尺寸格室加筋土结构对酸性环境较碱性敏感,等效直径为0.45 m较0.34 m对酸碱反应大,易产生剪切破坏;两种直径PET格室加筋土在酸环境下表观黏聚力分别减小9.2%和7.8%,碱环境下受影响较小。而PP材料直径为0.34 m时不受酸、碱影响,只有直径为0.45 m时在碱环境下减小13.3%,且不受酸环境影响。

关键词: 格室加筋土, 酸、碱环境, 格室加筋土理论模型, 力学性质

Abstract: The damage pattern of the specimen and the basic physical parameters of the soil fill were determined and analyzed through the conventional triaxial test on the compartment reinforced soil after soaking in acid and alkali solutions. Combined with the stress-strain curve obtained from the triaxial test, the stress-strain response model of the compartment reinforced body was verified, and then the changes in stress-strain response and apparent cohesion of the compartment reinforced soil with equivalent diameters of 0.34 m and 0.45 m under acid and alkali environments were investigated and analyzed by using the solidification and drainage triaxial test. The research results showed that triaxial test obtained compartment reinforced soil Duncan-Zhang model parameters applied to the bias stress-axial strain, body strain-axial strain relationship curve with the test curve almost match, that was, the derivation of the formula calculations in line with the test data; stress-strain response analysis, PET than PP compartment reinforced soil acid and alkaline environment, and the PET material two sizes of the compartment reinforced soil structure of the acidic environment more sensitive to alkaline, equivalent diameter of 0.45 m than 0.34 m to acid and alkali response, easy to produce shear damage; two diameters of PET compartments reinforced soil in the acid environment, the apparent cohesion decreased by 9.2% and 7.8%, respectively, and the alkali environment was less affected. While the PP material diameter of 0.34 m was not affected by acid and alkali, only the diameter of 0.45 m was reduced by 13.3% in the alkali environment, and was not affected by the acid environment.

Key words: compartment reinforced soils, acid and alkaline environments, theoretical modelling of compartment reinforced soils, mechanical properties

中图分类号:

U417.115

孙传迪,宋飞. 酸性及碱性环境下土工格室加筋土结构力学性质[J]. 山东大学学报 (工学版), 2025, 55(5): 140-153.

SUN Chuandi, SONG Fei. Structural-mechanical properties of geocell-reinforced soils in acidic and alkaline environments[J]. Journal of Shandong University(Engineering Science), 2025, 55(5): 140-153.

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