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

Abstract

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，并同时具有良好的排水性能。 The final aim of this research is to systematize the reinforced-earth wall sy8tem using the geesynthetic composite reinforcements in the weathered granite backfill soils containing relatively large amount of fines with low permeability．As a staged endeavour to accomplish this purlxt弛，laboratory pdlout tests and finite element modeling are carried out focusing on the analysis of friction characteristics associated with interaction behaviors of the geosynthetic composite reinforeements 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 geotcd ale 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 all increase of the tensile resistance，together with drainage effects.