生物胶改良黏土抗崩解特性试验研究

为研究生物胶对黏土抗崩解性的影响,采用黄原胶、瓜尔胶及黄原胶与瓜尔胶质量比为1∶1混合的复合胶对黏土进行改良,通过抗崩解试验,探究生物胶的含量和种类、压实度对改良黏土抗崩解特性的影响规律,并结合扫描电镜试验进一步分析了生物胶的改良机理。结果表明:生物胶通过增强土体颗粒之间黏聚力增强改良黏土的抗崩解特性,其崩解破坏过程可分为稳定前崩解阶段、稳定崩解阶段及稳定后崩解阶段;随着生物胶含量的增大,改良黏土稳定前崩解阶段延长,崩解速率减缓,崩解率降低;复合胶改良黏土抗崩解特性在质量分数大于1.0%后强于单一生物胶;随着压实度的提升,试样抗崩解特性明显改善。

Experimental study on disintegration resistance of clay improved by biological glue

In order to study the anti-disintegration properties of biological glue modified clay, xanthan gum, guar gum, and mixed composite glue of xanthan gum and guar gum mass with ratio of 1∶1 were used to improve the clay. Through the anti-disintegration test, the effects of biological glue content, type and compaction degree on the anti-disintegration properties of improved clay were investigated, and the improvement mechanism of biological glue was further analyzed by scanning electron microscopy test. The results show that the biological glue enhances the anti-disintegration property of the sample by enhancing the cohesion between soil particles. The collapse failure process can be divided into the pre-stable collapse stage, stable collapse stage and post-stable collapse stage. With the increase of biological glue content, the disintegration stage of the improved clay is prolonged, the disintegration rate slows down, and the disintegration rate decreases. The disintegration resistance of the modified composite adhesive is stronger than that of single biological adhesive when the content is greater than 1.0%. With the increase of compaction degree, the disintegration resistance of the sample is obviously improved.