不同固化剂对花岗岩残积土抗崩解性的影响

The anti-disintegration effect of different curing agents on granite residual soil

开展了崩解试验、扫描电镜测试和分形分析,以对比木质素固化剂和聚丙烯酰胺(PAM)固化剂对残积土抗崩解特性的影响.木质素固化剂土体的前期崩解稳定性较高,然而其较高的溶解性使试样的崩解量在试验后期呈指数型增长.PAM固化剂的弹性包裹固结特性使试样在试验前期局部迅速崩解破坏;其分子量大,不易迁移扩散,使试样在崩解中后期保持较高的完整性.最终,木质素固化剂试样和PAM固化剂试样的完全崩解时间较原状残积土延长了167%和500%.因此,PAM固化剂较木质素固化剂在提高残积土抗崩解性方面更具优势.

To modify natural granite soil for less landslide erosion, an disintegration test, scanningelectron micrograph(SEM)test and fractal analysis were carried out to analyze the efficacy of lignin curing agent and PAM curing agent on the anti-disintegration characteristics of residual soil.The results showed that the disintegrating process of soil samples with lignin curing agent showed relatively high stability in the early stage, which was attributd to the rigid binding characteristics of lignin curing agent. However, its high solubility led to the disintegration at an exponential rate in the middle and later stages. When it comes to PAM curing agent, its consolidation mechanism by elastic package led to a quick partial disintegration at the early stage. However, due to its high molecular weight and low diffusivity, soil samples treated with PAM curing agent maintained relatively high integrity in the middle and later stages of the test. At last, the total disintegration time for lignin curing agent specimens and PAM curing agent specimens were 167% and 500% longer than that of natural residual soil. PAM curing agent was more advantageous than lignin curing agent in improving the anti-disintegration property of residual soil for better durability.