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张亮亮, 邓刚, 陈锐, 皇甫泽华, 陈铄. 用于获取三轴土样局部水力特性的孔压量测新方法[J]. 岩土工程学报, 2023, 45(S1): 20-23. DOI: 10.11779/CJGE2023S10009
引用本文: 张亮亮, 邓刚, 陈锐, 皇甫泽华, 陈铄. 用于获取三轴土样局部水力特性的孔压量测新方法[J]. 岩土工程学报, 2023, 45(S1): 20-23. DOI: 10.11779/CJGE2023S10009
ZHANG Liangliang, DENG Gang, CHEN Rui, HUANGPU Zehua, CHEN Shuo. New method with measurable pore-water pressure for studying local hydraulic properties of triaxial soil specimens[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(S1): 20-23. DOI: 10.11779/CJGE2023S10009
Citation: ZHANG Liangliang, DENG Gang, CHEN Rui, HUANGPU Zehua, CHEN Shuo. New method with measurable pore-water pressure for studying local hydraulic properties of triaxial soil specimens[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(S1): 20-23. DOI: 10.11779/CJGE2023S10009

用于获取三轴土样局部水力特性的孔压量测新方法

New method with measurable pore-water pressure for studying local hydraulic properties of triaxial soil specimens

  • 摘要: 土体孔隙水压力的量测对于研究其水力特性至关重要。土体的散粒体结构特性使其内部细颗粒极易在水流作用下发生迁移而改变孔压分布,进而影响土体内部的局部结构和水力特性。为捕捉颗粒迁移导致的土体结构局部化响应,提出一种适用于三轴土样可量测局部孔压的新方法。新方法能满足带导管式乳胶膜受应力作用时的密封需求,由此可沿土样轴向和径向布设孔压传感器量测不同位置的孔压,进而研究土体局部水力特性。渗蚀试验结果表明,新方法在应用时具有较好的响应效果,土体局部渗透系数的时空演变揭示了细颗粒迁移具有显著的局部性和不均匀性。

     

    Abstract: Measuring the pore-water pressure within a soil mass is critical for studying its hydraulic properties. Due to the granular structure characteristics of soil, the fine particles within soil are prone to migrate with the movement of water flow. The migration of fine particles may change the distribution of the pore-water pressure, thereby altering the local structure and hydraulic properties of soil. In this study, a new method with measurable local pore pressure is introduced to capture the localized response of pore structure of soil induced by the migration of fine particles. The new method meets the sealing requirements of the latex membrane with inserted pipes under stress. Thus, the pore-water pressure transducers can be arranged along the axial and radial directions of the soil specimens to measure the pore pressure at various positions, thereby helping to study the local hydraulic properties. The global and local evolution characteristics of the soil specimens during suffusion are studied using new the method in the suffusion tests. The results show that the new method has a satisfactory response. The spatial and temporal evolution of local hydraulic conductivity reveals that the migration of fine particles along seepage path exhibits significant localization and non-uniformity.

     

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