钙质砂固化体强度特性及统计损伤本构模型研究  

Study on the strength characteristics and statistical damage constitutive model of calcareous sand solidification form

作　　者：魏珍珍 杨慧[1,2] 江学良 王浩冬[1] 尹军 杨伯韬 WEI Zhenzhen;YANG Hui;JIANG Xueliang;WANG Haodong;YIN Jun;YANG Botao(School of Civil Engineering,Central South University of Forestry and Technology,Changsha 410004,China;School of Civil Engineering and Engineering Management,Guangzhou Maritime University,Guangzhou,510725,China)

机构地区：[1]中南林业科技大学土木工程学院,湖南长沙410004 [2]广州航海学院土木与工程管理学院,广东广州510725

出　　处：《湖南城市学院学报(自然科学版)》2025年第2期6-13,共8页Journal of Hunan City University:Natural Science

基　　金：国家自然科学基金项目(31971727);广东省普通高校重点领域专项(2023ZDZX4044,2023ZDZX4045);广东省重点建设学科科研能力提升项目(2022ZDJS092);湖南省林业科技创新计划项目(XLK202105-3);广州市教育局高校科研项目(2024312379,2024312426)。

摘　　要：本文利用酶诱导碳酸盐沉淀(EICP)固化南海某岛礁钙质砂,并基于钙质砂固化体的固结不排水三轴试验,研究了固化轮次与围压变化对钙质砂固化体强度特性的影响规律,建立了适用于钙质砂固化体的统计损伤本构模型。研究结果表明:EICP能有效提升钙质砂的力学性能,尤其在固化轮次由4增加到5时,其峰值压缩强度与抗剪强度均有显著的增长;随着围压的增加,钙质砂固化体的破坏模式呈从脆性破坏逐步向鼓胀破坏转变的趋势;所建立的统计损伤本构模型能较好地描述钙质砂固化体的应力-应变关系。This study employs enzyme-induced carbonate precipitation(EICP)to stabilize calcareous sand from a reef in the South China Sea.The effects of curing cycles and confining pressure variations on the strength properties of calcium sand solidifier was examined through consolidated undrained triaxial tests.And then a statistical damage constitutive model was developed to describe the mechanical behavior of calcareous sand solidification form.The experimental results reveal that EICP treatment significantly improves the mechanical performance of calcareous sand.Notably,when the curing cycles increase from 4 to 5,the peak compressive strength and shear strength exhibit substantial enhancements.The failure mode of cemented calcareous sand demonstrates a progressive transition from brittle failure to bulging failure with increasing confining pressure.The proposed constitutive model accurately captures the stress-strain relationship of calcium sand solidifier.

关 键 词：钙质砂 EICP 固化轮次 统计损伤本构模型 

分 类 号：TU441[建筑科学—岩土工程]