摘要
简要介绍了国内外加筋土的设计计算方法．对加筋土的计算通常有两种思路，一种是把加筋土看成由土与筋材两种不同性质的材料组成，两者通过界面相互影响、相互作用；一种是把加筋土看成宏观上均匀的各向异性复合材料．但是第一种方法至少需要筋、土、界面三种本构关系模型和相应计算参数，当加筋层数较多时，计算处理的工作量较大．后一种思路的缺点在于复合材料是各向异性的，其刚度矩阵计算、方程求解都比较困难，而且它的各向异性复合材料参数也难以获得．为此介绍了一种新的数值计算方法：等效附加应力法．它的基本思路是把加筋土中筋的作用等效成附加应力沿筋的方向加在土骨架上，取加筋土中的土体进行计算．
Geosynthetics attracts great attention after the 98-flood in China. In this paper, practice of geosynthetic-reinforced soll, together with its design methods are introduced. Generally, there are two ap-proaches in analysis of reinforced soil: one is dealing with soil and reinforcement separately, they interact with each other through the fraction on the interface between them. The other is considering the reinforced soil as an anisotropic homogeneous composite. However, in the former approach, at least three constitutive models of soil, reinforcement and interface are necessary, and many relative parameters are needed, calculation may be very complex when soil is densely reinforced- The shortcoming of the latter is that the reinforced soil is anlsotroplc, which makes it difficult to calculate matrix and solve equations. It is also very difficult to deter-mine the parameters of the anisotropic composite in-situ by laboratory tests. A new approach: equivalent addi-tional stress method is also presented in this paper. The basic principle of the method is that only soil skeleton is concerned in analysis of reinforced soil while the reinforcing materlal is considered to be an equivalent addi-tional stress acting on the soil skeleton.
出处
《水利水电技术》
CSCD
北大核心
1999年第5期67-69,共3页
Water Resources and Hydropower Engineering
基金
自然科学基金!59479016
关键词
土工合成材料
加筋土
等效附加应力法
计算
geosynthetics, geosynthetic-reinforced soil, equivalent addit1onal stress method
