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通过三轴试验对发泡颗粒混合轻量土抗剪强度特性进行了研究.结果表明:剪胀条件下轻量土的峰值主应力差早于最大有效主应力比到达或者二者同时到达,剪缩条件下二者则同时到达.应力-应变曲线的软化与硬化是剪胀剪缩的外在表现,软化型宜采用峰值主应力差标准,硬化型采用轴向应变15%标准.破坏包线有直线型与折线型,包线形态受配比与围压控制.黏聚力、有效黏聚力随EPS颗粒掺入比增大而减小,随水泥掺入比增大而增大;内摩擦角、有效内摩擦角随EPS颗粒掺入比增大而减小,随水泥掺入比增大没有显著变化规律,介于6.0°～13.0°.低围压,试样破坏形态为鼓型,出现剪切带,反之为收缩型,不出现剪切带.
The shear strength characteristics of lightweight aggregate mixed with foamed beads were studied by triaxial tests. The results show that the difference of peak principal stress between lightweight aggregate and soil reaches its peak value earlier than the maximum effective principal stress ratio The shrinkage conditions both arrive at the same time.The softening and hardening of the stress-strain curve are the external manifestations of dilatancy and shear shrinkage.The softening type should adopt the standard of peak principal stress difference, the hardened type should adopt the axial strain of 15% There are linear and polygonal lines, the shape of the envelope is controlled by the confining pressure and the cohesion and effective cohesion decrease with the increase of the EPS particle incorporation ratio, but increase with the increase of the cement mixing ratio. The internal friction Angle and effective internal friction angle decreased with the increase of EPS particle incorporation ratio, but did not change significantly with the increase of cement incorporation ratio, ranging from 6.0 ° to 13.0 °. Low confining pressure showed that the failure mode of the sample was drum type, Shear band appears, on the contrary for the contraction type, there is no shear band.