关于合肥湖积软土固化最优配比的试验研究

Experimental Study on the Optimal Proportionof Stabilizing Lacustrine Soft Soil of Hefei

该试验以GGBS(粒化高炉矿渣微粉)为固化剂,以MgO和Na2SO4作为GGBS性能激发剂,制备GGBS+MgO+Na2SO4来固化合肥湖积软土.应用Box-Behnken试验设计法,选定GGBS、MgO和Na2SO4的掺量作为3个自变影响因子,固化土的7 d和28 d无侧限抗压强度作为应变响应值,探寻3种添加剂的最优配比.结果表明:养护7 d后,GGBS和MgO的交互作用明显;养护28 d后,GGBS与Na2SO4的交互作用明显.最终通过进一步仿真选优可知:GGBS、MgO和Na2SO43掺量固化软土最优配比为13.03%、2.50%和4.97%,在最优配比下7 d和28 d的预测强度分别达到1000.43 kPa、1647.17 kPa.此学术成果对实际工程中使用GGBS固化软土有一定的参考价值.

In this experiment,GGBS+MgO+Na2SO4 was prepared to solidify Hefei lake soft soil with GGBS(granulated blast furnace slag powder)as solidifying agent and MgO and Na2SO4 as performance activator of GGBS.By using Box-Behnken test design method,three self-variable influencing factors were selected as GGBS,MgO and Na2SO4,and the unconfined compressive strength of solidified soil at 7 d and 28 d was taken as strain response value to explore the optimal ratio of three additives.The results showed that the interaction between GGBS and MgO was obvious after 7 days of curing,and the interaction between GGBS and Na2SO4 was obvious after 28 days of curing.Finally,through further simulation and optimization,it could be seen that the optimal proportion of GGBS,MgO and Na2SO4 was 13.03%,2.50%and 4.97%.Under the optimal proportion,the predicted strength of d7 and d28 respectively reaches 1000.43kpa and 1647.17 kpa.This academic achievement had certain reference value in practical engineering using GGBS to solidify soft soil.