延安新区高填方填筑黄土新型固化技术的影响因素

Influencing Factors of New Curing Technology for Filling Loess of High Fills in Yan'an New District

为研究改良黄土的新型固化技术及其影响因素,探究最优改良方案,通过正交试验分析了石灰掺量、硫酸钠掺量、交流电压和通电时间4个因素对改良黄土无侧限抗压强度的影响。结果表明:采用该新型固化技术改良黄土的方法行之有效,其无侧限抗压强度是同等压实度条件下现场回填压实黄土的3倍;各因素中硫酸钠掺量对改良黄土的强度影响最大,石灰掺量与通电时间次之,交流电压最小;最优改良方案为石灰掺量6%,硫酸钠掺量1%,交流电压80 V,通电时间50 s。

In order to study the influencing factors of the new curing technology of loess and explore the optimal curing solu- tion, effects of such four factors as lime content, sah content, alternating voltage and conduction time on the unconfined compressive strength of the loess is analyzed with orthogonal tests. Results show that the new curing technology is effective, and the unconfined compressive strength has been improved to about three times as much as the untreated loess under the condition of corresponding compaction degree. Besides, salt content is the main influencing factor of unconfined compressive strength, lime content and conduction time are the secondary ones, and the alternating current voltage is the least one. And the improved loess＇ s strength reaches its peak with the lime content of 6%, the salt content of 1%, and 80 V voltage imposed on the test sample for 50 s.