生物酶改良有机质土的一维次固结双曲线特性研究  

Study on hyperbolic properties of one dimensional secondary consolidation of organic soil modified by biological enzymes

作　　者：张艺馨 文畅平 袁湘黔 汤翔 ZHANG Yixin;WEN Changping;Yuan Xiangqian;TANG Xiang(School of Civil Engineering,Central South University of Forestry and Technology,Changsha,Hunan 410018,China;Hunan Engineering Laboratory for Manufacturing and Application Technology of Modern Timber Structural Engineering Materials,Changsha,Hunan 410018,China)

机构地区：[1]中南林业科技大学土木工程学院,长沙410018 [2]现代木结构工程材制造及应用技术湖南省工程实验室,长沙410018

出　　处：《湖南城市学院学报（自然科学版）》2022年第4期1-6,共6页Journal of Hunan City University:Natural Science

基　　金：国家国际科技合作专项(2014DFA53120);现代木结构工程材制造及应用技术湖南省工程实验室开放基金资助项目(HELFMTS1707);湖南省重点学科建设项目(2013GDXK006);中南林业科技大学引进高层次人才科研启动基金项目(104-0094)。

摘　　要：以描述生物酶改良有机质土的一维次固结特性为研究目的,开展该土体的次固结试验,确定其结构屈服应力,研究不同生物酶掺量下改良有机质土的次固结系数与荷载的关系﹒基于此,引入双曲线模型,建立了生物酶掺量与模型参数的关系,并利用该模型进行预测,试验值与预测值吻合度较高﹒研究结果表明:1)生物酶能有效地减小改良有机质土的压缩变形量;在较高荷载作用下,不同生物酶掺量的有机质土次固结特性较明显﹒2)当荷载小于结构屈服应力时,该土体的次固结系数与荷载呈正相关性;当荷载等于结构屈服应力时,其次固结系数达到峰值;当荷载大于结构屈服应力时,其次固结系数与荷载呈负相关性。In order to describe the one-dimensional secondary consolidation characteristics of organic soil improved by biological enzyme, the secondary consolidation test of the soil is carried out to determine its structural yield stress. The relationship between secondary consolidation coefficient and load of improved organic soil with different amount of biological enzyme was studied. On this basis, the hyperbolic model is introduced to establish the relationship between the amount of biological enzyme and the parameters of the model, and the model is used to predict the high degree of coincidence between the experimental value and the predicted value. The results show that: 1)Biological enzyme can effectively reduce the compression deformation of improved organic soil;under higher load, the secondary consolidation characteristic of organic soil with different amount of biological enzyme is more obvious. 2)When the load is less than the structural yield stress, the secondary consolidation coefficient of the soil is positively correlated with the load, and the secondary consolidation coefficient reaches the peak when the load is equal to the structural yield stress;when the load is greater than the yield stress of the structure, the coefficient of consolidation is negatively correlated with the load.

关 键 词：路基工程 生物酶改良有机质土 结构屈服应力 双曲线模型 次固结试验 

分 类 号：TU411[建筑科学—岩土工程]