摘要
为有效提高砂土填料的抗剪强度并降低其重度,利用废弃轮胎橡胶颗粒的良好表面摩擦性与低重度特性,将其掺入到砂土填料,形成加筋机制,通过直剪和三轴压缩试验,研究多种掺入比与不同围压条件下砂土剪切性状,对应力—应变特征进行模拟,并提出模型参数。根据实验结果,峰值剪切强度随橡胶颗粒掺入量增加而减小,峰值偏应力或峰值应力比在300-400 kPa围压下随橡胶掺入量增加而减小,在100-200 kPa围压下,基本不变,砂土泊松比受橡胶颗粒掺入量影响,并随主应力发生“弯转”。围压小于200 kPa,掺入10%-20%的轮胎橡胶颗粒可提高砂土的抗剪强度,并降低材料重度,砂胶混合材料应力—应变关系可用Dun-can-Chang模型模拟。
To enhance the shear strength and reduce the unit weight of sandy fill materials, disposed scrap tire bead was added to sand. The tire bead presented relatively high friction and low unit weight, which led to the formation of reinforced low density mixtures. Direct shear and triaxial compression tests were conducted to observe the effects of scrap tire bead additions and confinements on the shear behavior of the sand. Stress-strain relations were observed and simulated. It was found that peak shear strength decreased along with increased bead addition, whereas confinements enhanced the peak shear strengths of materials. Peak deviators or peak stress ratios were influenced by bead additions more clearly under high confinements than under low confinements. Poisson＇ s ratios were associated with the bead additions and the principal stresses. Tire bead additions of 10-20% enhanced sand shear strength under confinements equal to or less than 200 kPa. The stress-strain relationship of the mixtures can be modeled by using Duncan-Chang elastic nonlinear constitutive law.
出处
《解放军理工大学学报（自然科学版）》
EI
北大核心
2009年第5期483-487,共5页
Journal of PLA University of Science and Technology(Natural Science Edition)
基金
江苏省自然科学基金资助项目(BK2009027)
