摘要
为了准确描述生物酶改良后膨胀土的应力-应变关系,控制生物酶掺量(即掺入的生物酶质量与膨胀土干质量之比)为唯一变量,进行等向固结与回弹试验以及不同固结压力下的三轴排水剪切试验。基于黏性土常用的修正剑桥类模型框架,得到生物酶掺量对参数λ(正常固结线斜率),κ(回弹曲线斜率)和M(剪切破坏线斜率)的影响规律,分析生物酶掺量对弹性墙内的塑性剪切变形以及对魏汝龙模型相关参数的影响。最终,建立以生物酶掺量为扰动因子的修正MCC模型与修正魏汝龙模型。研究结果表明:修正魏汝龙模型对膨胀土的应力-应变关系描述更准确;与MCC模型相比,修正MCC模型能够大幅提高对生物酶改良膨胀土的应力.应变关系描述的准确程度。
In order to accurately describe the stress-strain relationship of the bioenzyme-treated expansive soil, isotropic consolidation tests and three axial drained shear tests under different consolidation pressures were conducted using the enzyme dosage (i. e., the ratio of bioenzyme mass to dry mass of expansive soil) as the sole variable. Based on the commonly used Cam-clay model framework for clayey soil, the influence of bio-enzyme dosage on the parameters λ(slope of normal consolidation line),κ(slope of rebound curve) and M (slope of shear failure line) of Cam-clay model were obtained. The effects of bio-enzyme dosage on the plastic shear deformation in elastic walls and the parameters related to Wei Rulong-Khosla-Wu model were analyzed. Finally, a modified MCC model and a modified Wei Rulong-Khosla-Wu model were established using the enzyme dosage as the disturbance factor. The results show that the modified Wei Rulong-Khosla-Wu model is the most accurate for describing the stress-strain relationship of expansive soil. When compared with the MCC model, the modified MCC model can greatly improve the accuracy of describing the stress-strain relationship of bioenzyme-treated expansive soil.
作者
陈永青
文畅平
方炫强
陈宗辉
孙政
王解军
CHEN Yongqing;WEN Changping;FANG Xuanqiang;CHEN Zonghui;SUN Zheng;WANG Jiejun(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;Hunan Provincial Communications Planning, Survey & Design Institute, Changsha 410018, China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2019年第8期1981-1990,共10页
Journal of Central South University:Science and Technology
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(2013ZDXK006)(Project(2014dfa53120)~~
关键词
路基工程
生物酶改良膨胀土
修正MCC模型
修正魏汝龙模型
扰动理论
subgrade engineering
bioenzyme-treated expansive soil
modified MCC model
modified Wei Rulong-Khosla-Wu model
perturbation theory
