生物聚合物改良玄武岩残积土崩解特性研究

为提高玄武岩残积土的抗崩解性及其边坡水稳性，利用生物聚合物瓜尔胶改良玄武岩残积土。在干湿循环条件下开展不同掺量瓜尔胶改良玄武岩残积土的崩解试验，观察残积土崩解过程，并对残积土改良土崩解系数和平均崩解速率进行测定，分析瓜尔胶掺量及干湿循环次数对玄武岩残积土水稳性的影响。研究结果表明：瓜尔胶可有效增强玄武岩残积土的抗崩解性能，随着瓜尔胶掺量的增加，改良玄武岩残积土的崩解系数和平均崩解速率呈现先减小后增加的特点，在瓜尔胶掺量为1.0%时抗崩解性能最佳；瓜尔胶掺量一定时，改良玄武岩残积土的崩解系数和平均崩解速率随着干湿循环次数的增加呈现增长趋势，当干湿循环次数N=4时，土体崩解率为N=1时的8倍。由此可见，瓜尔胶作为一种新型、环保的残积土边坡防护材料，可有效提升玄武岩残积土的抗崩解性能。研究结果为生态环保处置玄武岩残积土提供了新的思路，可为玄武岩残积土地区边坡工程的绿色发展提供参考。

Research on disintegration characteristics of biopolymer modified basalt residual soils

In order to enhance the resistance to disintegration and water stability of basalt residual soil slope, biopolymer guar gum was used to improve the basalt residual soils. The effect of guar gum proportion and the number of wet and dry cycles on the water stability of basalt residual soils were analyzed by conducting slaking tests on basalt residual soil modified with different amounts of guar gum under dry and wet cycles, observing the disintegration process of residual soil and measuring the coefficient and average disintegration rate of residual soil improvement soil. The results show that guar gum can effectively enhance the disintegration resistance of basalt residual soil. The disintegration coefficient and the average disintegration rate of the modified basalt residual soil show a characteristic of decreasing and then increasing with the increase of guar gum proportion. The best disintegration resistance is achieved when the guar hum content is 10%; When the guar gum content is in a certain proportion, the disintegration coefficient and average disintegration rate of the modified basalt residual soil show a growth trend with the increase of the number of wet and dry cycles. When the number of wet and dry cycles is N=4, the soil disintegration rate is 8 times of N=1. Accordingly, guar gum as a new and environmentally friendly residual soil slope protection material, can effectively improve the disintegration resistance of basalt residual soil. The research results provide new ideas for eco-friendly treatment of basalt residual soil, and provide a reference for the green development of slope engineering in the area of basalt residual soil.