摘要
针对搅拌时间影响因素对水泥土强度性能影响的研究不足,结合洞庭湖区某分洪闸工程的淤泥质土地基,探讨搅拌时间以及其他不同影响因素对水泥土无侧限抗压强度的影响。采用正交试验法在不同养护龄期条件下开展3种不同水灰比、水泥掺入比、搅拌时间的室内水泥土无侧限抗压强度试验,假设4个影响因素(水灰比、水泥掺入比、搅拌时间和养护龄期)之间无相互影响,进而用乘积模型建立了多因素影响的水泥土无侧限抗压强度模型,并采用优化算法识别了模型的参数。研究表明,不同养护龄期下影响水泥土无侧限抗压强度的因素重要性次序分别为水灰比、水泥掺入比、搅拌时间。水灰比和水泥掺入比与水泥土无侧限抗压强度基本呈抛物线关系,而搅拌时间和养护龄期与水泥土无侧限抗压强度基本呈对数关系。考虑搅拌时间的多因素影响的水泥土无侧限抗压强度模型计算值与试验数据拟合良好,可运用于水泥土无侧限抗压强度的预测,对实际水泥土工程具有一定参考作用。
In view of the insufficiency of the influencing factors of mixing time on the strength properties of cemented soil, this paper combines the muddy soil foundation of a flood gate project in Dongting Lake area to discuss the influence of mixing time and other different influencing factors on the unconfined compressive strength of cement soil. The unconfined compressive strength test of indoor cement soil with different water-cement ratios, cement mixing ratios and mixing time under different curing ages is carried out by orthogonal test method, assuming four influencing factors(water-cement ratio, cement). There is no mutual influence between the mixing ratio, mixing time and curing age. Then the multi-factor-affected cement soil unconfined compressive strength model is established by the product model, and the parameters of the model are identified by the optimization algorithm. The research shows that the order of importance of factors affecting the unconfined compressive strength of cement soil under different curing ages is water-cement ratio, cement mixing ratio and mixing time. The water-cement ratio and cement mixing ratio are basically parabolic with the unconfined compressive strength of cemented soil, while the mixing time and curing age are basically logarithmic with the unconfined compressive strength of cemented soil. Considering the multi-factor effect of mixing time, the calculated values of the unconfined compressive strength model of cemented soil are well fitted with the experimental data, and can be applied to the prediction of unconfined compressive strength of cement soil, which has certain effect on actual cement soil engineering.
作者
殷晓慧
费大伟
黄耀英
方国宝
蔡忍
周勇
YIN Xiao-hui;FEI Da-wei;HUANG Yao-ying;FANG Guo-bao;CAI Ren;ZHOU Yong(College of Water Resources and Environment,Three Gorges University,Yichang 443002,Hubei Province,China;Changjiang Institute of Survey,Planning,Design and Research,Wuhan 430010,China)
出处
《中国农村水利水电》
北大核心
2019年第11期188-193,201,共7页
China Rural Water and Hydropower
基金
国家自然科学基金资助项目(51779130)
关键词
水泥土
正交试验法
无侧限抗压强度
搅拌时间
强度模型
cement soil
orthogonal test method
unconfined compressive strength
mixing time
strength model
作者简介
殷晓慧(1995-),女,硕士研究生,主要从事水工程安全监控方面的研究。E-mail:yinxiaohui_ss@163.com;通讯作者:黄耀英(1977-),男,教授,博士,主要从事水工程长效服役实验、数值计算及调控等方面的教学和科研。E-mail:huangyaoying@sohu.com。
