XYY型生物聚合物改良黏土抗开裂及抗冲刷特性研究

Study on Anti-cracking and Anti-scouring Characteristics of XYY Biopolymer Modified Clay

为探究XYY型生物聚合物改良黏土抗开裂及抗冲刷特性,进行若干开裂及冲刷试验。试验结果表明:在干燥条件下,随着生物聚合物的掺入,试样的抗开裂特性明显改善,生物聚合物的掺入增强了土体的抗拉强度,使其大于试样因干燥脱水而产生的张拉应力,试样随生物聚合物掺量的增加由发生开裂转变为脱水聚缩,且试样残留的含水率随生物聚合物掺量的增加而增加,XYY型生物聚合物的掺入增强了土体的保水性。素土试样在冲刷后,发现明显的冲蚀破坏痕迹,冲刷率达49.56%,而生物聚合物改良土冲刷后结构仍较为完整。当生物聚合物掺量达2.0%时,试样的冲刷率仅为0.81%,说明生物聚合物改良后黏土拥有良好的抗冲刷效果。同时微观机理分析得出,XYY型生物聚合物可以有效填充黏土颗粒间的空隙,使其结构更加紧密,能有效改良黏土的抗开裂和抗冲刷特性。

In order to explore the anti-cracking and anti-scouring characteristics of XYY biopolymer modified clay,several cracking and scouring tests were carried out.The test results show that under dry conditions,with the addition of biopolymer,the anti-cracking characteristics of the sample are significantly improved.The addition of biopolymer enhances the tensile strength of the soil,which is greater than the tensile stress of the sample due to drying and dehydration.With the increase of the biopolymer content,the sample changes from cracking to dehydration and shrinkage,the residual moisture content of the sample increases with the increase of the content of biopolymer.The addition of XYY biopolymer enhances the water retention of the soil.After scouring,plain soil samples develops obvious erosion damage traces,and the scouring rate is 49.56%,while the structure of biopolymer improved soil is still relatively complete.When the content of biopolymer reaches 2.0%,the scouring rate of the sample is only 0.81%,indicating that the clay improved by biopolymer has a good anti scouring effect.At the same time,the micro mechanism analysis shows that the XYY biopolymer can effectively fill voids between clay particles,make the clay structure more compact,and effectively improve the anti-cracking and anti-scouring characteristics of clay.