土工袋材与沟坡土的界面摩擦特性试验研究

Experimental study on frictional characteristics of interface between geobag material and agro-ditch slope soil

为探究土与土工合成材料筋土界面的摩擦特性,本文以砌护沟坡的土工袋袋材无纺土工布为加筋材料,农田排水沟边坡土为填料,开展了土工布与土界面的室内直剪试验,分析了压实度、含水率及不同法向应力对筋土界面摩擦特性的影响。试验结果表明:土与土工布的界面抗剪强度随着含水率的增加先增大后降低,随着压实度的增大而增大。筋土界面摩擦系数随着含水率的增加先增大后减小,随着压实度的增大而增大。摩擦系数与法向应力具有一定的反比关系,并随着法向应力的增大呈递减趋势。研究结果对于土工袋技术在农田排水沟边坡治理以及类似工程中的应用具有一定的参考价值。

In order to explore the frictional characteristics of the interface between the soil and the geosynthetic reinforcement material,an indoor direct shear test is conducted through taking the non-woven geotextile of the geobag for protecting the agro-ditch slope as the reinforcing material and taking the geo-ditch slope soil as the filling material,and then the impacts from compactness and water content as well as different normal stresses on the frictional characteristics of the interface between the soil and the geosynthetic reinforcement material are analyzed.The experiment result shows that the shearing strength of the interface between the soil and the geotextile increases at first and then decreases along with the increase of water content,and increases along with the increase of the compactness.Meanwhile,the frictional coefficient of the interface between the soil and the geosynthetic reinforcement material increases at first and then deceases along with the increase of water content,and increases along with the increase of the compactness.The frictional coefficient has a certain inverse relationship with the normal stress and exhibits a decline trend along with the increase of the normal stress.The study result has a certain referential value for the application of the geobag technology to the treatment of the agro-ditch slope and the similar project concerned.