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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 water stability is poor, easy to produce water collapse and destruction, can cause the stability of loess buildings. The unconfined compressive strength test, wet disintegration test, uniaxial tensile test, triaxial compression test and infiltration test were used to study the engineering properties of lignosulfonate solidified loess. The effects of lignin sulfonate Feasibility of strengthening loess. The results show that the calcium lignosulfonate can improve the engineering properties of loess, while the lignin sulfonate is the opposite; as the content of calcium lignosulfonate increases, the compressive strength and tensile strength of the cured soil increase first and then decrease ; The smaller the water content, the greater the density, the greater the strength of the cured soil; with the curing age increases, the strength of the cured soil first increases, and then tends to be stable. The loess has a remarkable improvement in the disintegration characteristics of loess when it is doped with calcium lignosulfonate. When the content of loess is 1.0% and the curing period is 7 d, the loess is hardly disintegrated. After the calcium lignosulphonate is incorporated into the soil, the permeability decreases. Studies have shown that calcium lignosulfonate can significantly improve the engineering properties of loess. In engineering applications, it is recommended to add 1.0% calcium lignosulfonate to loess and maintain for 7 days. Combined with the scanning electron microscopy observation, further analysis of calcium lignosulfonate on the soil engineering performance impact mechanism. Calcium lignosulfonate reinforcement loess mechanism is mainly composed of cement particles and fill the pores of two parts.