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基于简化的颗粒单元体模型,分析总结了颗粒单元体的基本特点,针对中主应力对砂土强度的影响,重点分析了颗粒单元体之间的相互影响特点。对以往的真三轴试验结果进行了总结,得到了中主应力对砂土强度影响的规律,结合颗粒单元体的两种基本状态及其特点、大孔隙与颗粒单元体结构孔隙的特点以及颗粒单元体间相互影响的特点,揭示了中主应力对砂土强度影响规律的细观物理机制。这些规律包括:松砂的强度随着中主应力的增大是逐渐提高的;密砂随中主应力的增大,强度先提高,当中主应力接近大主应力时,却引起强度的降低;砂土越密实,强度平台段越长;在中主应力接近小主应力阶段,强度随中主应力的增大而提高的快慢与砂土的密实程度有关。
Based on the simplified particle unit model, the basic characteristics of the particle unit are analyzed and summarized. The influence of the middle principal stress on the sand strength is analyzed, and the interaction among the unit particles is analyzed emphatically. Based on the results of previous true triaxial tests, the influence of middle principal stress on the strength of sand was obtained. Based on the two basic states of particle units and their characteristics, the characteristics of macropores and the pores of unit cell structure, The inter-unit interaction has revealed the meso-physical mechanism of the influence of middle principal stress on sand strength. These laws include: the strength of loose sand gradually increases with the increase of middle principal stress; the tight sand increases first with the increase of middle principal stress, while when the main stress approaches the main principal stress, the strength decreases; The more dense sandy soil, the longer the platform segment of strength. When the middle principal stress is close to the small principal stress stage, the strength increases with the increase of middle principal stress, which is related to the compaction degree of sand.