生物酶改良膨胀土的应力-应变关系归一化特性  

Normalized Stress-strain Property of Bioenzyme-treated Expansive Soil

作　　者：文畅平[1,2] WEN Changping(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 of Central South University of Forestry and Technology,Changsha 410018,China)

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

出　　处：《应用基础与工程科学学报》2019年第5期1091-1101,共11页Journal of Basic Science and Engineering

基　　金：国家国际科技合作专项(2014DFA53120);中南林业科技大学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);中南林业科技人学引进高层次人才科研启动基金项目(104-0094)

摘　　要：以生物酶改良膨胀土的应力-应变关系归一化特性为研究对象,提出了基于生物酶掺量的生物酶改良膨胀土的应力-应变关系特性的归一化方程.通过不同生物酶掺量下的三轴固结排水剪切试验,生物酶改良膨胀土的应力-应变关系均表现为应变硬化型,应力-应变关系曲线为典型的双曲线.基于Duncan-Chang模型参数拟合方法,分析了生物酶掺量对相应参数的影响,提出了生物酶掺量与相应参数的关系表达式.采用主应力差渐近值(σ1-σ3)ult作为归一化因子,给出了相应的归一化条件,对生物酶改良膨胀土在不同生物酶掺量、不同围压σ3下的应力-应变关系特性进行归一化分析,其应力-应变关系特性归一化程度较高.通过所建立的应力-应变关系归一化方程对生物酶改良膨胀土的应力-应变曲线进行预测,预测曲线与试验曲线较为接近,可以较好地预测出不同生物酶掺量、不同围压σ3下的应力-应变关系.The normalized stress-strain property of bioenzyme-treated expansive soil was analyzed,and a normalized stress-strain equation was presented to predict the stress-strain curve of bioenzyme-treated expansive soil under different ratio of bioenzyme-based soil stabilizer.The triaxial consolidated drained shear tests were conducted to study the stress-strain relationship behaviors of bioenzyme-treated expansive soil under different ratio of bioenzyme-based soil stabilizer,the stress-strain relationship of bioenzyme-treated expansive soil is strain hardening,and the stress-strain curves are the typical hyperbola pattern.Based on the parameters fitting method of Duncan-Chang model,the influences of ratio of bioenzyme-based soil stabilizer on the relevant parameters are studied,and the expresions between ratio of bioenzyme-based soil stabilizer and the relevant parameters are presented respectively.The ultimate value of principal stress difference(σ1-σ3)ult is used as the normalized factor,and the normalized condition is presented.According to study the normalized stress-strain properties of bioenzyme-treated expansive soil under different ratio of bioenzyme-based soil stabilizer and confining pressures σ3,the normalized factor is much better at normalizing the stress-strain relationship of bioenzyme-treated expansive soil.According to the prediction of the strees-strain curves of bioenzyme-treated expansive soil by the normalized stress-strain equation,the prediction curves agree better with the test curves of the stress-strain relationship,the established normalized stress-strain equation could well predict the stress-strain relationship under different bioenzyme-based soil stabilizer and confining pressures σ3.

关 键 词：生物酶改良膨胀土 应力-应变关系 归一化 应变硬化 三轴剪切试验 

分 类 号：TU411[建筑科学—岩土工程]