摘要
以建筑渣土为研究对象,通过比重、击实、承载比(CBR)及剪切试验方法,对其原状土的基本工程性能进行了室内研究.基于试验结果,进一步采用石灰、水泥和砂对建筑渣土进行改性处理,以提升其作为路基填料的适用性.结果表明:三种改良剂均能提升建筑渣土的路用性能.其中水泥掺量为 4%时,改性土CBR值可达130.66%,较原状土相比提升116.45%;石灰掺量为4%时,其CBR值为128.59%,较原状土相比提升114.38%;砂掺量为5%时改良土较原状土CBR值也有所增加,但效果不及水泥和石灰;原状土经水泥、石灰、砂改良后的抗剪强度也有一定的提升.其中水泥掺量为5%、石灰掺量为4%和砂掺量为5%时抗剪强度较好,与原状土相比,黏聚力分别提升 154.0%、164.5%和 74.6%,内摩擦角分别提升 343.7%、310.2%及78.3%.
Abstract
Using construction waste as the research subject,basic engineering properties of the native soil were investigated through laboratory tests including specific gravity,compaction,california bearing ratio(CBR),and shear tests.Based on the test results,the construction waste was further modified with lime,cement,and sand to enhance its suitability as a subgrade filler.The results show that all three additives significantly improve the road performance of the construction waste.Specifically,when4%cement was added,the CBR value of the modified soil reached 130.66%,representing an increase of 116.45%compared to the untreated soil.When4%lime was added,the CBR value was128.59%,an increase of 114.38%compared to the untreated soil.Although the addition of 5%sand also improved the CBR value,the effect was less pronounced than that of cement and lime.Furthermore,the shear strength of the untreated soil improved after modification with cement,lime,and sand.The optimal shear strength was achieved with 5%cement,4%lime,and 5%sand,resulting in increases in cohesion of 154.0%,164.5%,and 74.6%,respectively,and increases in the internal friction angle of 343.7%,310.2%,and 78.3%,respectively,compared to the untreated soil.
维普
万方数据