复合固结黏性土强度及抗裂性能的正交试验

利用正交试验设计方法,以7d无侧限抗压强度为考核指标,对用ZL-1土质固化剂、石灰、水泥作为固化材料的复合固结黏性土进行了试验设计,采用极差、方差分析方法对试验结果进行了分析。结果表明水泥是对固结土强度影响最大的因素,其次是石灰,固化剂的影响较小。在正交试验的基础上,考虑了强度、造价以及施工难度等因素,确定了固结土的优化配合比,即固化剂用量0.015%、石灰用量6%。此优化配比的7d无侧限抗压强度为1.22MPa,与传统石灰土(石灰10%)7d无侧限抗压强度基本相等。对优化配合比条件下的复合固结黏性土与传统石灰土的抗裂性能进行了对比分析,结果表明固结土的温度抗裂性能与干燥抗裂性能均优于传统的石灰稳定土。

Orthogonal Experimental Design for Strength and Anti-crack Performance of Compound Stabilized Clay Soil

A study was conducted to design an experiment of the compound consolidated clay soil stabilized by ZL-1 solidifying agent, lime and cement with orthogonal experimental design method using the unconfined compressive strength for seven days as the examining index. Range analysis and variance analysis methods were used to analyse the test result. Result shows that the cement has the greatest impact on the strength of the compound consolidated clay soil, and then followed by the lime and the solidifying agent in sequence. The optimized mixture ratio was obtained as solidifying agent 0.015%, lime 6% and the unconfined compressive strength for seven days 1.22MPa in accordance with strength, cost, construction difficulty and other factors by orthogonal experiment. The seven-day unconfined compressive strength of the consolidated clay soil under the optimized mixture ratio condition is basically the same with that of the traditional lime soil (the dosage of the lime is 10%). The comparative analysis of the anti-crack performances shows that the temperature-shrinkage and dry-shrinkage performances of the compound consolidated clay soil under the optimized mixture ratio condition are superior to those of the traditional lime soil.