黄土的水稳性较差，遇水容易产生崩解破坏，可造成黄土地区建筑物失稳。采用无侧限抗压强度试验、湿化崩解试验、单轴拉伸试验、三轴压缩试验和渗透试验，对木质素磺酸盐固化黄土的工程性质进行试验研究，探讨木质素磺酸盐加固黄土的可行性。试验结果表明，木质素磺酸钙可以改善黄土的工程性能，而木质素磺酸钠则相反；随着木质素磺酸钙掺量的增加，固化土的抗压和抗拉强度先增加后降低；含水率越小，密度越大，则固化土的强度越大；随着养护龄期的增长，固化土的强度先增加，而后趋于稳定。黄土在掺入木质素磺酸钙后，黄土的崩解特性显著改善，在掺量为1.0%和养护龄期为7 d时，几乎不发生崩解。木质素磺酸钙掺入土体后，渗透性降低。研究表明，木质素磺酸钙可显著改善黄土的工程性能。在工程应用中，建议在黄土中掺加1.0%的木质素磺酸钙，养护7 d。结合扫描电子显微镜观察，进一步分析木质素磺酸钙对土体工程性能产生影响的作用机制。木质素磺酸钙加固黄土的机制主要在于胶结土颗粒与填充孔隙两部分。

Loess has poor water stability. It will disintegrate, when encounters water, and cause instability of the building foundations in loess area. The application of lignosulfonate for loess reinforcement and related engineering properties are evaluated by experimental program including unconfined compressive strength test, disintegration test, uniaxial tension test, triaxial compression test and permeability test. The test results indicate that calcium lignosulfonate improves engineering properties of loess rather than sodium lignosulfonate. Compression and tensile strength of the stabilized soil firstly increase and then decrease as the content of calcium lignosulfonate increases. Less moisture content generates greater the density and greater strength of the solidified soil. The strength of strengthened soil increases firstly and then stabilizes as the growth of curing age. Calcium lignosulfonate presents favorable reduction on loess disintegration and penetrability. The research concludes that calcium lignosulfonate can significantly improve the engineering properties of loess. The suitable addition amount of calcium lignosulfonate should be 1.0% and the curing age should be 7 days. The scanning electron microscope analysis assists the further discussion on two mechanisms for the improvement of engineering characteristics of loess by calcium lignosulfonate: soil particles cementing and pore filling.