用于耐气候花岗岩填充土壤加固的复合土工合成材料的拉伸特性和排水作用

Pullout Characteristics and Drainage Effects of the Geosynthetic Composite Reinforcements in the Weathered Granite Backfill Soils

本项研究的最终目的是使加强土墙体系系统化 ,该体系在包含大量低渗透性细小颗粒的风化花岗岩回填土中使用复合土工合成材料。作为达到此目的的阶段性努力 ,进行了试验室的拉伸试验并建立了有限元模型 ,以便分析由抗拉强度较好的土工格栅和排水性能良好的土工布组成的复合土工合成材料的摩擦性能和相互作用。基于有限差分数字模型的分析 ,测试了放在土工格栅下面的土工布的排水性能。从目前的研究可以推断 ,风化花岗岩回填土中的复合土工合成材料或许可用于减少变形和增加抗拉强度 。

The final aim of this research is to systematize the reinforced earth wall system using the geosynthetic composite reinforcements in the weathered granite backfill soils containing relatively large amount of fines with low permeability. As a staged endeavour to accomplish this purpose, laboratory pullout tests and finite element modeling are carried out focusing on the analysis of friction characteristics associated with interaction behaviors of the geosynthetic composite reinforcements composed of geogrid with a superior function in tensile resistance and geotextile with a sufficient drainage. In addition, drainage effects of the geotextile laid below the geogrid are examined based on the analysis of finite difference numerical modeling. From the present investigation, it is concluded that the geosynthetic composite reinforcements in the weathered granite backfills may possibly be used to achieve combined effects on a reduction of deformations and an increase of the tensile resistance, together with drainage effects.