基于响应面法的淤泥质土固化配方优化研究  

Optimization of formula for stabilizing muddy soil using response surface methodology

作　　者：畅帅[1,2] 徐日庆[1,2] 李雪刚[1,2] 廖斌[1,2] 王兴陈[1,2] 

机构地区：[1]浙江大学滨海和城市岩土工程研究中心,杭州310058 [2]浙江大学软弱土与环境土工教育部重点实验室,杭州310058

出　　处：《岩土力学》2014年第1期105-110,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目(No.51178420)

摘　　要：选择掺入生石膏、生石灰、碳酸钠来消除有机质对水泥固化淤泥质土的不利影响。以生石膏、生石灰和碳酸钠的掺量作为3个影响因子,以固化淤泥质土7 d和90 d的无侧限抗压强度为响应值,采用旋转中心组合设计安排试验。利用响应面法对这3种外加剂的配比进行优化,并通过单因子效应分析和交互作用分析分别考察各影响因子单独变化对强度响应值的影响以及3种添加剂的交互作用效应。结果表明:强度响应对生石膏和生石灰掺量变化的敏感程度随龄期的增大而增大,而对于碳酸钠,情况则相反。7 d时,生石灰与碳酸钠的交互作用显著;而90 d时,则生石膏与碳酸钠的交互作用显著。最终得出在腐植酸掺量6%和水泥掺量15%前提下,3种外加剂在7 d和90 d的最佳配比。在最优配方的掺加下,对于7 d和90 d龄期固化淤泥质土的实际强度可以分别达到623、1 213 kPa。Gypsum, lime and sodium carbonate are selected as additives to eliminate the disbenefits of organic matter on cement stabilization. Response surface methodology（RSM） based on central composite rotatable design（CCRD） is employed for experiment arrangement and optimizing the ratios of additives, in which response values are the unconfined compressive strength values of 7 days and 90 days while the contents of additives are independent variables. Meanwhile, one-factor and mutual-influence analysis are used to investigate the effect of each factor on response values and evaluate mutual-influence among the three independent variables. The results show that strength as response value becomes more sensitive to the content of gypsum and lime as the age increases. However, the situation is reverse for sodium carbonate. With the age of 7 days and 90 days, the mutual-influence for lime and sodium carbonate, gypsum and sodium carbonate are significant respectively. On the premise of humic acid content is 6%, cement content is 15%, the optimal ratios for additives with the age being 7 days and 90 days are presented and once the optimal ratios for additives are applied, the actual strength of stabilized muddy soil can reach 623 kPa（7 d） and 1 213 kPa（90 d）.

关 键 词：腐植酸 旋转中心组合设计 响应面法 最佳配比 

分 类 号：TU411[建筑科学—岩土工程]