纳米土壤固化剂重构黄土力学性能的试验研究
张星辰1,2,3, 高建恩1,2,3,4, 樊恒辉5, 李兴华4,5, 高 哲5, 郭子豪1, 龙韶博2, 薛 利1

(1.中国科学院 水利部 水土保持研究所, 陕西 杨凌 712100; 2.西北农林科技大学 水土保持研究所, 陕西 杨凌 712100; 3.中国科学院大学, 北京 100039; 4.水利部 水土保持生态工程技术研究中心, 陕西 杨凌 712100; 5.西北农林科技大学 水利与建筑工程学院, 陕西 杨凌 712100)

纳米固化剂; 固化土; 无侧限抗压强度; 力学性能

Experimental Research on Mechanical Properties of Reconsolidated Loessial Soil with Nano Soil-Stabilizer
ZHANG Xingchen1,2,3, GAO Jianen1,2,3,4, FAN Henghui5, LI Xinghua4,5, GAO Zhe5, GUO Zihao1, LONG Shaobo2, XUE Li1

(1.Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China; 2.Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China; 3.University of Chinese Academy of Sciences, Beijing 100049, China; 4.Research Center on Soil & Water Conservation, Ministry of Water Resources, Yangling, Shaanxi 712100, China; 5.College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China)

nano soil stabilizer; stabilized soil; unconfined compressive strength; mechanical properties

备注

为了提升土壤固化剂这一水土资源高效利用材料的固土性能,通过室内典型力学试验,研究了新型纳米土壤固化剂对重构黄土土体力学性能的影响。结果表明:(1)纳米土壤固化剂掺量与固化土的无侧限抗压强度呈指数函数关系;(2)纳米固化土各龄期无侧限抗压强度相较普通固化土和32.5号水泥土可提升10%～30%;(3)对比3种不同固化土的吸水率、干密度和颗粒粒径与抗压强度的关系,发现纳米固化土的微观结构及宏观性能表现更加优越。采用纳米固化剂能显著提升黄土的物理力学性能,在黄土高原等缺砂少石地区具有广阔的工程应用前景。
In order to improve the properties of stabilized soil which can make full use of local soil and water resources, the effect of new nano soil-stabilizer on the mechanical properties of reconsolidated loessial soil was studied through typical laboratory mechanical tests. The results indicate that:(1)the unconfined compressive strength of stabilized soil shows the exponential function with the content of nano soil stabilizer;(2)the unconfined compressive strength of nano stabilized soil can be improved by about 10%～30% compared with ordinary stabilized soil and grade 32.5 cement soil;(3)it was found that the microstructure and mechanical properties of the nano stabilized soil were more superior by comparing the relationship between water absorption, dry density, particle size and compressive strength of three different stabilized soils. Using nano soil stabilizer can significantly improve the physical and mechanical properties of loessial soil, which has a broad engineering application prospect in the Loess Plateau and other areas lacking sand and rock.