摘要
针对云南加筋红土的三轴试验结果,研究排水条件、筋材种类、加筋层数等因素对云南红土加筋效果的影响。加筋效果采用加筋效果系数、归一化加筋效果系数和加权加筋效果系数来衡量。结果表明:红土的加筋效果系数随围压的变化规律不显著,但归一化加筋效果系数的绝对值随围压的增大逐渐减小并趋向于零,强度和变形加权加筋效果系数随加筋层数的增加而增大,孔压加权加筋效果系数随加筋层数的增加而减小;红土在完全排水条件下加筋,强度加筋效果系数大于1,并随加筋层数的增加而增大;在固结不排水条件下加筋,强度和变形加筋效果系数都随加筋层数的增加逐渐增大,孔压加筋效果系数则随之逐渐减小;在完全不排水条件下加筋,强度和变形加筋效果系数都小于或等于1。认为红土的加筋机理可以从筋材在土体中所具有的隔离效应、阻力效应、拱效应、压密效应、孔压效应等几个方面的综合作用来解释。
Based on the results of triaxial tests on reinforced Yunnan laterite, the effects of drainage conditions, reinforcing materials and geogrid layers on the reinforcement of Yunnan laterite were studied. The reinforcement effects were measured by means of the coefficients of reinforcement effects, normalized reinforcement effects and weighted reinforcement effects. The results shows that the coefficient of the reinforcement effects doesn＇ t change evidently with the change of confining pressure, but the coefficient of the normalized reinforcement effects decreases and tends to zero when the confining pressure increases. The coefficients of the weighted reinforcement effects of strength and deformation increase but those of pore pressure decrease with the increase of the geogrid layers. For the completely drained reinforced laterite samples, the coefficient of the strength rcinforcement effects is larger than 1 and increases with the increase of the layers. For the consolidated and undrained reinforced laterite samples, the coefficients of both the strength and deformation reinforcement effects increase but those of the pore pressure decrease with the increase of the geogrid layers. For the completely undrained reinforced samples, the coefficients of both the strength and deformation reinforcement effects are not larger than 1. The reinforcement mechanism of laterite can be interpreted from the aspects of isolation effects, resistance effects, arching effects, compaction effects and pore pressure effects of the reinforcing materials.
出处
《水利水电科技进展》
CSCD
北大核心
2011年第6期35-40,73,共7页
Advances in Science and Technology of Water Resources
基金
国家自然科学基金(59968002
50868009)
关键词
加筋红土
排水条件
加筋效果
加筋机理
reinforced laterite
drainage condition
rcinforcement effect
reinforcement mechanism
