基于响应面法的冻结改良黏土配比优化及单轴抗压本构模型OA
Optimization of the proportion of frozen improved clay based on response surface methodology and uniaxial compressive constitutive model
为解决低强度黏土引发的工程稳定性问题,提出冻结法与粉煤灰-水泥复合改良技术协同应用方案.通过单因素试验确定温度、水泥掺量及粉煤灰掺量的合理范围,运用响应面法系统分析各因素及其交互作用对改良黏土单轴抗压强度的影响规律.基于最优配比(水泥8%、粉煤灰12%)开展改良黏土与原始黏土的对比试验,构建相应的应力-应变曲线模型.结果表明:各因素对改良黏土强度均有显著影响,其中粉煤灰掺量与温度的交互作用最为显著;在-5、-10、-15℃下,改良黏土单轴抗压强度较原始黏土分别提高372.5%、178.2%、180.6%.建立的应力-应变模型可准确描述改良黏土的力学行为,为人工冻结法施工提供理论依据与设计参考.
To address the stability issues caused by low-strength clay in engineering,this study proposes the application of the freezing method in combination with the fly ash-cement composite improvement approach.Through single-factor experiments,the reasonable ranges of temperature,cement and fly ash dosage were determined.The response surface method was used to systematically analyze the influence laws of each fac-tor and their interaction on the uniaxial compressive strength of the improved clay.After determining the op-timal ratio(8%cement and 12%fly ash),comparative tests between the improved soil and the original soil were carried out,and the corresponding stress-strain constitutive model was established.The research re-sults show that each factor has a significant impact on the strength of the improved soil,among which the in-teraction between fly ash and temperature is the most prominent.Compared with the original soil,the uniaxi-al compressive strength of the improved soil at-5℃,-10℃and-15℃increased by 372.5%,178.2%and 180.6%respectively.The established stress-strain model can accurately describe the mechanical behav-ior of the improved soil,providing a theoretical basis and design reference for artificial freezing method con-struction.
姚兆明;朱雯佳
安徽理工大学 土木建筑学院,安徽 淮南 232001安徽理工大学 土木建筑学院,安徽 淮南 232001
建筑与水利
响应面法改良黏土人工冻结法应力-应变曲线
response surface methodmodified clayartificial freezing methodstress-strain curve
《河南城建学院学报》 2026 (2)
49-56,8
矿山地下工程教育部工程研究中心开放研究项目(JYBGCZX2021104)
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