木质素固化疏浚土的压缩特性研究

为研究木质素固化疏浚土的压缩性状,对固化疏浚土进行了多组不同配比下的木质素固化土压缩试验。通过室内固结试验以及无侧限抗压试验,研究了木质素固化土以及木质素水泥双掺固化土的压缩性状,探讨了固化材料掺量、龄期等对固化土压缩特性的影响。试验结果表明:木质素固化土的最优掺量为10%,抗压强度可达到8.6 MPa。木质素固化疏浚土与水泥土类似,二者的压缩曲线都有一个明显的结构屈服点。当上部所加荷载未达到结构屈服应力时,固化土的压缩性很小,而当荷载超过结构屈服应力以后固化土的压缩量比未达到结构屈服应力之前增大了3倍。木质素水泥双掺固化土随着二者掺量的增加,抗压强度有显著的提升,25%木质素掺量的固化土水泥掺量从10%增加到30%后土体抗压强度增长了8.9倍,最为明显。研究结果可为实际工程中木质素固化土强度提供数据参考。

Compression Characteristics of Dredging Soil Solidified by Lignin

Compression tests of dredging soil solidified by different contents of lignin were conducted to study the compression characteristics.Through indoor consolidation tests and unconfined compression tests,the compressive properties of soil solidified by lignin and cement-lignin were studied.The effects of solidifying material content and curing age on the compressive properties of solidified soil were investigated.Test results showed that the optimum content of lignin was 10％and the compressive strength reached 8.6 MPa.Dredging soil solidified by lignin is similar to cement soil in an obvious structural yield point of their compression curves.The compressibility of the solidified soil is very small when the upper load has not achieved structural yield stress;while the compressive capacity is three times larger when the load exceeds the structural yield stress.With the increase of lignin and cement contents,the compressive strength of soil solidified by cement and lignin has significantly improved.With the cement content of dredging soil with 25％lignin increasing from 10％to 30％,the compressive strength increased by 8.9 times,of which the increase was the most obvious.The research results provide data reference for the strength of soil solidified by lignin in practical engineering.