木质素磺酸钙改良花岗岩残积土路用性能研究  

Study on the Road Performance of Granite Residual Soil Improvedby Calcium Lignosulfonate

作　　者：朱文羲 邓华锋[1,2] 李建林[1,2] 熊雨 程雷 Zhu Wenxi;Deng Huafeng;Li Jianlin;Xiong Yu;Cheng Lei(Key Laboratory of Geological Hazards on Three Gorges Reservoir Area,Ministry of Education,Yichang,Hubei 443002,P.R.China;College of Civil Engineering&Architecture,China Three Gorges University,Yichang,Hubei P.R.China)

机构地区：[1]三峡库区地质灾害教育部重点实验室,湖北宜昌443002 [2]三峡大学土木与建筑学院,湖北宜昌443002

出　　处：《地下空间与工程学报》2025年第2期523-532,共10页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(U22A20600,U2034203);湖北省自然科学基金创新群体项目(2020CFA049)。

摘　　要：为改良花岗岩残积土以满足路堤填筑的需求,综合考虑木质素磺酸钙的特点,设计并开展木质素磺酸钙改良花岗岩残积土试验,综合宏观物理力学试验、室内模型试验以及微细观检测,系统分析了木质素磺酸钙能否满足路堤填筑需求以及改良机制。结果表明:(1)木质素磺酸钙的掺入,有效改良了花岗岩残积土路用性能,木质素磺酸钙掺量在4.00%达到最佳,与改良前相比,液限降低了32.28%、塑限降低了40.06%、最佳含水率降低了18.63%、承载比提升了567.09%,并且改良后均满足填筑规范要求;(2)木质素磺酸钙的掺入,显著提高了花岗岩残积土的力学性能,2.00%~8.00%掺量下固化体的抗压强度提升了61.12%~126.11%,内摩擦角增加了13.08%~37.74%,黏聚力提升了108.50%~379.86%;(3)木质素磺酸钙改良花岗岩残积土的增强机制主要有两个方面,一方面木质素磺酸钙水解后其本身能够发生质子化反应形成木质素聚合物,能够胶结土体,提升力学性能;另一方面木质素磺酸钙水解出的钙离子通过离子交换反应形成了典型的碳酸盐胶结物质CaMg(CO_(3))_(2),而碳酸盐胶结强度高于黏土矿物。In order to improve the granite residual soil to meet the needs of embankment filling,considering the characteristics of calcium lignosulfonate,the test of improving granite residual soil with calcium lignosulfonate was designed and carried out.The macroscopic physical and mechanical test,indoor model test and microscopic test were carried out to systematically analyze whether calcium lignosulfonate could meet the needs of embankment filling and the improvement mechanism.The results show that:(1)The addition of calcium lignosulfonate effectively improves the road performance of granite residual soil.The content of calcium lignosulfonate reaches the best at 4.00%.Compared with before improvement,the liquid limit is reduced by 32.28%,the plastic limit is reduced by 40.06%,the optimum moisture content is reduced by 18.63%,and the bearing ratio is increased by 567.09%.(2)The incorporation of calcium lignosulfonate significantly improved the mechanical properties of granite residual soil.The compressive strength of the solidified body increased by 61.12%~126.11%,the internal friction angle increased by 13.08%~37.74%,and the cohesion increased by 108.50%~379.86% under the dosage of 2.00%~8.00%.(3)There are two main aspects of the enhancement mechanism of calcium lignosulfonate modified granite residual soil.On the one hand,after the hydrolysis of calcium lignosulfonate,it can undergo protonation reaction to form lignin polymer,which can cement the soil and improve the mechanical properties.On the other hand,the calcium ions hydrolyzed from calcium lignosulfonate form a typical carbonate cementing material CaMg(CO_(3))_(2) through ion exchange reaction,and the carbonate cementing strength is higher than that of clay minerals.

关 键 词：花岗岩残积土 木质素磺酸钙 路基填筑 增强机制 

分 类 号：TU449[建筑科学—岩土工程]