建筑垃圾加筋土性能研究

Properties of reinforced soil filled with construction waste

通过大型三轴试验,对比了不同掺量建筑垃圾与砂混合的强度特性及其复合加筋效果。分析了改变建筑垃圾掺量对试样强度的影响规律,并对比了不同种类筋材与不同掺量建筑垃圾混合试样复合加筋的效果,以及筋材铺设层间距对试样整体强度的影响。试验结果表明,掺入建筑垃圾能提高砂土黏聚力和内摩擦角,其中掺入60%建筑垃圾的试样整体性能要优于掺入40%建筑垃圾的试样。使用不同种类筋材的试样均有明显剪胀现象,加入筋材均能有效提高试样的整体性能,其中掺入60%建筑垃圾且层间距为20 cm的土工格室复合加筋试样整体性能较优;在限制砂土侧向变形方面,掺入40%建筑垃圾填料与2层筋材复合加筋试样中使用土工格栅侧向变形较小;掺入60%建筑垃圾填料与2层筋材复合加筋试样中使用土工格室侧向变形较小。使用建筑垃圾与筋材复合加筋时,其筋材铺设层间距为20 cm较适宜。

Through the large-scale triaxial test,the strength characteristics of different amount of admixture of construction waste and sand are compared,and the composite reinforcing effect is analyzed.The influence of different construction waste contents on the strength of samples is analyzed,the effect of composite reinforcement of different kinds of reinforcement material and different amount of admixture of construction waste,and the influence of the reinforcement spacing on the overall strength of the samples are compared.The experimental results show that adding construction waste can increase the cohesion and internal friction angle of specimens.The overall performance of the sample with 60% construction waste is better than that with 40% construction waste.Specimens with different kinds of reinforcement have obvious dilatancy,and the overall performance of the sample can be effectively improved by adding of reinforcement materials.The overall performance of the geocell composite reinforcement samples with 60% construction waste and 20 cm layer spacing is better than that of others.The lateral deformation of geogrid reinforced specimen with 40% construction waste and two layers of reinforcement is smaller,and the lateral deformation of geocell reinforced specimen with 60% construction waste and two layers of reinforcement is smaller in terms of restricting the lateral deformation of specimen.When construction waste and reinforcement are used,it is appropriate if the reinforcement layer spacing of specimens is 20 cm.