合肥滨湖新区湖积软土固化配方试验研究
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摘要
湖积软土在合肥滨湖新区分布广泛,其性能难以满足工程建设需要,需进行固化处理。采用固化助剂粒化高炉矿渣(GGBS)和激发剂CaO、石膏,通过组合配比对加固体进行室内无侧限抗压强度试验。以GGBS、CaO和石膏的掺量作为影响因子,以7 d和28 d固化体的无侧限抗压强度作为响应值,采用BoxBehnken法进行试验。结果表明:7 d时,GGBS与石膏的交互作用显著;28d时,石膏与CaO的交互作用显著。通过交互作用分析,最终得出3种外添剂GGBS、CaO和石膏在7 d和28 d的最优配比分别为12.18%、3.62%、3.71%(7 d)和11.6%、4.08%、4.50%(28 d)。将GGBS固化土与水泥土的固化效果进行对比分析,验证新型固化材料GGBS作为软土固化剂的可行性。
The lacustrine soft soil is widely distributed in Binhu New Area of Hefei Province,and its performance is difficult to meet the need of project construction,which needs to be cured.(GGBS) and activator CaO,gypsum were used to control the indentation strength of the solidified body by the combination ratio.The effects of GGBS,CaO and gypsum as the influencing factors were studied by Box-Behnken method with the unconfined compressive strength of 7 d and 28 d.At 28 days,the interaction between gypsum and CaO was significant.The optimal ratios of GGBS,CaO and gypsum were 12.18%,3.62%,3.71%(7 d) and 11.6%and 4.08% respectively at 7 d and 28 d,respectively,by interaction analysis.4.50%(28 d).The feasibility of GGBS solidified soil and cement soil was compared and analyzed to verify the feasibility of the new curing material GGBS as soft soil curing agent.
The lacustrine soft soil is widely distributed in Binhu New Area of Hefei Province,and its performance is difficult to meet the need of project construction,which needs to be cured.(GGBS) and activator CaO,gypsum were used to control the indentation strength of the solidified body by the combination ratio.The effects of GGBS,CaO and gypsum as the influencing factors were studied by Box-Behnken method with the unconfined compressive strength of 7 d and 28 d.At 28 days,the interaction between gypsum and CaO was significant.The optimal ratios of GGBS,CaO and gypsum were 12.18%,3.62%,3.71%(7 d) and 11.6%and 4.08% respectively at 7 d and 28 d,respectively,by interaction analysis.4.50%(28 d).The feasibility of GGBS solidified soil and cement soil was compared and analyzed to verify the feasibility of the new curing material GGBS as soft soil curing agent.
引文
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[2]徐小磊.合肥市滨湖新区地质调查与城市地质研究[J].安徽地质,2007(2):81-84.
[3]邵艳,王仕传,李长勇.合肥滨湖新区软土物理力学特性相关性分析[J].工业建筑,2013,43(5):86-89.
[4]易耀林,李晨,孙川,等.碱激发矿粉固化连云港软土试验研究[J].岩石力学与工程学报,2013(9):1820-1826.
[5]易耀林,卿学文,庄焱,等.粒化高炉矿渣微粉在软土固化中的应用及其加固机理[J].岩土工程学报,2013,35(s2):382-384.
[6]邵艳,邢维忠,魏源.GGBS及其激发剂固化合肥湖积软土的试验研究[J].实验力学,2015(3):367-372.
[7]Box G.E.P..PALMER G M.Response Surface Methodologyolog-Revisited[J].Cereal Food Science,1976(21):432-445.
[8]黄雨,周子舟,柏炯,等.石膏添加剂对水泥土搅拌法加固软土地基效果影响的微观试验分析[J].岩土工程学报,2010(8):1179-1183.
[9]吴蓬.粒化高炉矿渣胶凝性能的活化工艺及水化机理研究[D].青岛:山东科技大学,2013.
[10]吴蓬,吕宪俊,胡术刚等.粒化高炉矿渣胶凝性能活化研究进展[J].金属矿山,2012(10):157-161.
[11]黄新,胡同安.水泥—废石膏加固软土的试验研究[J].岩土工程学报,1998(5):72-76.