双层立体加筋砂土的强度特性.pdf

第 25 卷 增 1 岩石力学与工程学报 Vol.25 Supp.1 2006 年 2 月 Chinese Journal of Rock Mechanics and Engineering Feb .，2006 双层立体加筋砂土的强度特性 张孟喜，王振武 (上海大学 土木工程系，上海 200072) 摘要：在提出立体加筋方式的基础上，对水平–竖向复合加筋和竖向加筋两种加筋形式的立体加筋砂土进行大量 的三轴试验。结果表明，相对于无筋土及传统的水平加筋砂土而言，立体加筋砂土强度有大幅度提高。对比分析 竖向加筋率与立体加筋砂土强度之间的关系，比较不同围压下的强度变化。在试验基础上，分析立体加筋砂土的 工作机制，并利用极限平衡理论建立双层立体加筋土的强度模型，最后将竖向加筋砂土的部分试验结果与理论值 进行对比，结果表明二者基本吻合。 关键词：土力学；立体加筋；工作机制；强度模型；三轴试验 中图分类号：TU 43 文献标识码：A 文章编号：1000 –6915(2006)增 1 –3289 –10 STRENGTH PROPERTIES OF TWO-LAYER THREE-DIMENSIONAL REINFORCED SAND ZHANG Mengxi ，WANG Zhenwu (Department of Civil Engineering ，Shanghai University ，Shanghai 200072 ，China) Abstract ：For conventional reinforced soils ，the reinforcements are often laid horizontally in the soil. A novel concept of three-dimensional reinforced soil is proposed in this paper. In the proposed 3D reinforced soil ，besides the conventional horizontal reinforcements ，some vertical and three-dimensional reinforcing elements are also placed in the soil. A series of triaxial tests are carried out on reinforced sand with two-layer horizontal-vertical 3D reinforcements and vertical reinforcements respectively. The results of triaxial tests show that the ultimate deviator stress at failure increases greatly for three-dimensional reinforced sand compared with unreinforced sand and horizontally reinforced sand. Furthermore ，the internal friction angle of three-dimensional reinforced sand increases significantly ；and cohesion