干湿循环作用下改良铁尾矿强度特性试验研究

Experimental Research on Strength Characteristics of Stabilized Iron Tailings under Drying-Wetting Cycles

为研究道路工程中固化剂改良铁尾矿的耐干湿循环能力,文章以无侧限抗压强度为评价指标,用水泥、土凝岩改良铁尾矿,经历干湿循环后测其强度,对单因素试验、均匀设计试验结果进行分析。结果表明:在干湿循环作用下,两种固化剂改良铁尾矿强度均随循环次数增加而衰减,经过5次循环后强度衰减变慢,土凝岩改良铁尾矿耐干湿循环能力较优;两种固化剂改良铁尾矿强度随着养护龄期的增加而增长,养护14d后增长幅度明显降低,强度逐渐趋于稳定;增加固化剂掺量及提高压实度均能使改良铁尾矿强度明显提升,且对土凝岩改良铁尾矿强度提升幅度较高;养护龄期、固化剂掺量、压实度对两种固化剂改良铁尾矿强度影响显著,而干湿循环次数对强度影响不显著。

In order to study the drying-wetting cycles resistance of the stabilized iron tailings by curing agents in road engineering,in this paper,the unconfined compressive strength is used as the evaluation index,stabilizing iron tailings with cement and soil stabilizer.The strength after experiencing dry and wet cycles are tested,and single factor test and uniform design test results are analyzed.The results show that under the action of drying-wetting cycles,the strength of the stabilized iron tailings of the two types of curing agents attenuate with the increase of the number of cycles.After five cycles,the strength decays slowly,and the soil stabilizer stabilized iron tailings has better resistance to dry-wet cycles.The strength of two curing agents stabilized iron tailings improve with the increase of curing time.After 14 days of curing,the increase rate is significantly reduced,and the strength becomes stable gradually.Increasing the amount of curing agent and increasing the degree of compaction can improve the strength of the stabilize iron tailings,and the improvement of the strength of the improved soil stabilizer stabilize iron tailings is higher.The curing time,the amount of curing agent and the degree of compaction have significant effects on the strength of the two curing agents stabilized iron tailings,while the number of dry and wet cycles has no significant effect on the strength.