摘要
针对生物酶改良粉土的固结蠕变特性,开展了不同生物酶掺量下粉土的一维固结蠕变试验,分析生物酶改良粉土的应变随时间的变化规律及次固结系数随固结应力的变化情况,提出了一种反映生物酶改良粉土蠕变过程应变与时间关系的双曲线蠕变模型,并分析生物酶掺量对双曲线蠕变模型相关参数的影响。结果表明:1)生物酶改良粉土的应变随时间的增加而增大,加载前期应变较大,后期逐步减缓并呈稳定发展趋势,生物酶改良粉土具有明显的非线性蠕变特性。2)素粉土的次固结系数随固结应力的增加呈先减小后增大再减小的趋势,改良后粉土较素粉土的次固结系数小,生物酶能有效改善粉土的蠕变特性。3)生物酶改良粉土的应变-时间关系为典型的双曲线,对该双曲线进行拟合,对比生物酶改良粉土的应变-时间曲线和双曲线蠕变模型理论曲线,建立的双曲线蠕变模型能较好地描述生物酶改良粉土蠕变过程的应变与时间关系。
In order to study the consolidation creep characteristics of bioenzyme-treated silt,one-dimensional consolidation creep tests of silt modified by different content of bioenzyme were carried out.The variation of strain with time and the correlation between secondary consolidation coefficient and consolidation stress were analyzed.A hyperbolic creep model was proposed to predict the relationship between strain and time of bioenzyme-treated silt in creep process.The effect of bioenzyme content on the parameters of hyperbolic creep model were analyzed.The experimental results show that:1)the strain of bioenzyme-treated silt increases with the increase of time,the strain in the early loading stage is large,and gradually slows down and presents a stable development trend.The bioenzyme-treated silt has obvious nonlinear creep characteristics.2)The secondary consolidation coefficient of silt decreases firstly,then increases,and then decreases with the change of consolidation stress,The secondary consolidation coefficient of bioenzyme-silt is small,and the creep characteristics of the bioenzyme-silt can be improved effectively by enzyme.3)The strain-time relationship curve of bioenzyme-treated silt is hyperbola.Compared with the strain-time curve of bioenzyme-treated silt and the theoretical curve of hyperbolic creep model,the hyperbolic creep model established in this paper can well describe the strain-time relationship of bioenzyme-treated silt in the creep process.
作者
邓新宇
文畅平
何振华
夏艳波
任睆遐
DENG Xinyu;WEN Changping;HE Zhenhua;XIA Yanbo;REN Huanxia(School of Civil Engineering, Central South University of Forestry and Technology, Changsha 410018, China;Hunan Engineering Laboratory for Manufacturing and Application Technology of Modern Timber Structural Engineering Materials, Central South University of Forestry and Technology, Changsha 410018, China)
出处
《中国科技论文》
CAS
北大核心
2022年第4期423-428,共6页
China Sciencepaper
基金
国家国际科技合作专项(2014DFA53120)
湖南省重点学科建设资助项目(2013GDXK006)。
关键词
岩土工程
生物酶改良粉土
一维固结蠕变
蠕变模型
geotechnical engineering
bioenzyme-treated silt
one-dimensional consolidation creep
creep model
