黄原胶改良黏土无侧限抗压强度及其加固机理研究

采用天然黄原胶对黏土进行加固，通过一系列无侧限抗压强度试验，对不同养护时间和黄原胶掺量条件下改良黏土的无侧限抗压强度特性进行试验研究，并对其加固机理进行较为深入的分析。试验结果表明：黄原胶作为添加剂可以在很大程度上提高黏土的无侧限抗压强度；随着黄原胶掺量和养护时间的增加，改良黏土试样的抗压强度也随之增加，并最终趋于稳定；黄原胶改良黏土的最适宜掺量是1.5%，最佳养护时间是14 d，当养护时间为14 d时，黄原胶掺量0.5%、1.0%、1.5%和2.0%的改良黏土样抗压强度相对素土样分别增加13.43%、20.85%、29.87%和34.70%。黄原胶基质通过增强黏土颗粒相互间的粘聚作用，增强了土样的整体性，从而达到增强黏土样抗压强度的目的。

Study on Unconfined Compressive Strength and Strengthening Mechanism of Xanthan Gum Modified Clay

The clay was strengthened with natural xanthan gum, and the unconfined compressive strength characteristics of improved clay under different curing time and xanthan gum content were studied through a series of unconfined compressive strength tests. And the reinforcement mechanism was analyzed deeply. The test results show that xanthan gum as an additive can improve the unconfined compressive strength of clay to a great extent, and the compressive strength of improved clay samples increases with the increase of xanthan gum content and time, and finally tends to be stable. The optimum content of xanthan gum to improve clay is 1.5%, and the best curing time is 14 days. When the curing time is 14 days, the strength of the improved clay samples containing 0.5%, 1.0%, 1.5% and 2.0% xanthan gum increase by 13.43%, 20.85%, 29.87% and 34.70% respectively. Xanthan gum matrix enhances the integrity and cohesion of soil samples by enhancing the cohesion of clay particles, so as to enhance the compressive strength of clay samples. The research results can provide a certain reference basis for the practical engineering application of clay strengthened with xanthan gum.