微生物改良膨胀土的动态回弹模量  

Dynamic rebound modulus of expansive soil improved by microorganisms

作　　者：郭晓东 李珍玉[1] 黄莹 罗深平 GUO Xiaodong;LI Zhenyu;HUANG Ying;LUO Shenping(School of Civil Engineering,Central South University of Forestry and Technology,Changsha,Hunan 410004,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

出　　处：《湖南城市学院学报（自然科学版）》2024年第4期1-7,共7页Journal of Hunan City University:Natural Science

基　　金：国家自然科学基金项目(50978097)。

摘　　要：为研究微生物诱导碳酸钙沉淀方法(microbial induced calcite precipitation,MICP)改良膨胀土的动态弹性模量,首先,对其开展了多组次动三轴试验,并计算得到了不同胶结液浓度下MICP方法改良膨胀土的动态回弹模量;然后,通过对比分析,探明了应力状态和胶结液浓度对动态回弹模量的影响规律,并揭示了胶结液浓度对动态回弹模量的影响机理;最后,通过对试验结果的非线性拟合并结合对NCHRP 1-28A模型的分析,探明了胶结液浓度对预估模型参数的影响规律,并提出了模型参数的分析方法。To study the dynamic rebound modulus of expansive soil improved by MICP method,first,multiple sets of dynamic triaxial tests are carried out,and the dynamic rebound modulus of improved expansive soil by MICP method is calculated under the conditions of different cementation solution concentration.Then,through comparative analysis,the influence laws of stress state and cementing solution concentration on dynamic resilience modulus are explored,and the influence mechanisms of cementing solution concentration on dynamic rebound modulus have been revealed.Finally,through nonlinear fitting of the test resultsand analysis of NCHRP 1-28A model,the influence laws of cementation solution concentration on the predicted model parameters are explored,and an analysis method for the model parameters has been proposed.

关 键 词：膨胀土 MICP方法 动态回弹模量 NCHRP 1-28A模型 

分 类 号：TU411[建筑科学—岩土工程]