吉林西部盐渍土分散性改良实验研究

Experimental study on improvement of dispersibility of saline soil in western Jilin

为研究无硫木质素对土体分散性的改良效果,以某地区分散性盐渍土为研究对象,以不同配比无硫木质素制备土样。通过碎块试验和针孔试验、无侧限抗压强度试验及扫描电镜试验对改性试样的分散性、无侧限抗压强度及微观结构进行测试。研究表明:加入无硫木质素后土体分散性得到明显改善;无硫木质素可以提高盐渍土的强度,但木质素含量达到15%时,会导致土样强度下降;无硫木质素通过填充土样孔隙、降低孔隙度、减少水的渗入以及物理联结作用来降低土的分散性。该试验探究了无硫木质素的改良机理,验证了其对盐渍土分散性改良的有效性和可行性,为价格低廉、经济高效的分散土改良新方法探索提供了一定理论依据。

In order to study the improvement effect of sulfur-free lignin on the dispersibility of saline soil,the dispersed saline soil in an area is taken as the research object,and soil samples are prepared with different ratios of sulfur-free lignin.The dispersion,unconfined compressive strength and microstructure of the modified samples are tested by fragment test,pinhole test,unconfined compressive strength test and scanning electron microscope test.The results show that the dispersibility of saline soil is significantly improved after adding sulfur-free lignin.Adding sulfur-free lignin can increase the strength of saline soil,but when the lignin content reaches 15%,the strength of the soil sample will decrease.After maintaining with sulfur-free lignin,the pores of soil samples filled,porosity reduced,with the result that water infiltration reduced,and some physical bonding formed to reduce the dispersibility of soil.The experiment explores the improvement mechanism of sulfur-free lignin,verifies the effectiveness and feasibility of improving the dispersibility of saline soil,and provides a certain theoretical basis for the exploration of new methods of dispersive soil improvement with low price,economy and efficiency.