CAJ | 학술논문

非饱和土的本构关系研究需获得任意压缩变形条件下的土-水特征曲线，但试验测量往往只能给出特定状态下的土-水特征曲线。压缩变形改变了土体孔隙分布特性，从而影响其土-水特征曲线。采用压汞技术、核磁共振技术、扫描电镜研究压缩变形条件下土体孔隙孔径分布的变化规律，基于实测及已有试验数据研究土-水特征曲线变化规律，通过孔径分布变化规律阐释压缩变形影响土-水特征曲线的机制。研究结果表明：在不同的压缩变形条件下，土体（单位颗粒质量）的累计孔隙体积分布整体上呈现“扫帚型”分布，质量含水率表示的土-水特征曲线也呈现相似的分布，二者变化规律较为一致，从而揭示了土-水特征曲线随压缩变形变化的内在机理。在此基础上，建议了一种压缩变形影响下的土-水特征曲线简化表征方法，其描述的土-水特征曲线与试验结果吻合较好。
비포화토적본구관계연구수획득임의압축변형조건하적토-수특정곡선，단시험측량왕왕지능급출특정상태하적토-수특정곡선。압축변형개변료토체공극분포특성，종이영향기토-수특정곡선。채용압홍기술、핵자공진기술、소묘전경연구압축변형조건하토체공극공경분포적변화규률，기우실측급이유시험수거연구토-수특정곡선변화규률，통과공경분포변화규률천석압축변형영향토-수특정곡선적궤제。연구결과표명：재불동적압축변형조건하，토체（단위과립질량）적루계공극체적분포정체상정현“소추형”분포，질량함수솔표시적토-수특정곡선야정현상사적분포，이자변화규률교위일치，종이게시료토-수특정곡선수압축변형변화적내재궤리。재차기출상，건의료일충압축변형영향하적토-수특정곡선간화표정방법，기묘술적토-수특정곡선여시험결과문합교호。
The soil-water characteristic curve(SWCC)under random compression deformation is needed for study on constitutive relations of unsaturated soil, while experiments only give the SWCC under a specific condition. Compression deformation influences SWCC by way of influencing the pore distribution property. Firstly, the variation law of pore-size distributions with compression deformation was studied by using the mercury injection technique, nuclear magnetic resonance and the scanning electron microscope. Then, the variation law of SWCC with compression deformation was systematically studied based on experimental re?sults and available published data. The results show that, for the pores corresponding with the unit particle mass, the cumulative volume or area distributions of different compression deformation present as a"broom" profile,while the SWCCs in terms of mass water content of different compression deformation pres?ent as a similar profile. The good agreement of the variation laws of pore-size distributions and SWCCs shows that the internal variation mechanism of SWCC with compression deformation can be explained through pore-size distributions. Also,a simplified representation method was presented to describe the influ?ence law of compression deformation on SWCC,and its rationality was testified by experimental results.