炭质泥岩粗粒土动态回弹模量及预估模型研究  

Study on dynamic resilience modulus and its prediction model of carbonaceous mudstone coarse-grained soil

作　　者：张文周 何忠明[1,2] 刘正夫 刘洋[1] ZHANG Wenzhou;HE Zhongming;LIU Zhengfu;LIU Yang(School of Traffic and Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,Hunan,China;National Engineering Research Center for Highway Maintenance Technology,Changsha University of Science&Technology,Changsha 410114,Hunan,China)

机构地区：[1]长沙理工大学交通运输工程学院,湖南长沙410114 [2]长沙理工大学公路养护技术国家工程研究中心,湖南长沙410114

出　　处：《水利水电技术（中英文）》2023年第2期161-169,共9页Water Resources and Hydropower Engineering

基　　金：国家自然科学基金项目(51978084);长沙理工大学研究生科研创新项目(CX2021SS117)。

摘　　要：【目的】为研究炭质泥岩粗粒土动态回弹模量在荷载、级配和含水率影响下的变化规律,【方法】开展室内三轴试验,探究不同应力状况、分形维数和含水率条件下炭质泥岩粗粒土的动回弹特性。【结果】试验结果显示:炭质泥岩粗粒土动态回弹模量随体应力的增大而增大,随动偏应力和含水率的增大而减小;含水率对动态回弹模量影响较大,在含水率较小时,回弹模量随分形维数的增大而减小,随着含水率的增大,回弹模量逐渐随分形维数的增大而增大。【结论】采用三参数复合模型对试验结果进行回归分析,试验结果与模型有较好的拟合效果,并提出了基于含水率和分形维数的三参数经验预估模型,可有效预估炭质泥岩粗粒土动态回弹模量。[Objective] In order to study the changing law of the dynamic resilience modulus of carbonaceous mudstone coarse-grained soil under the influences of load, gradation and water content, [Methods]an indoor triaxial experiment is carried out to explore the dynamic resilient characteristics of the carbonaceous mudstone coarse-grained soil under different conditions of stress status, fractal dimension and water content. [Results] The experiment result show that the dynamic resilience modulus of carbonaceous mudstone coarse-grained soil is increased with the increase of the bulk stress and decreased with the increases of the dynamic deviatoric stress and water content, while water content has a large influence on the dynamic resilience modulus, that is to say, the resilience modulus is decreased with the increase of the fractal dimension during the less water content and is gradually increased with the increase of the fractal dimension along with the increase of water content. [Conclusion] The experimental result are regressively analyzed with three-parameter composite model and the experiment result are better fitted with those from the model, while a water content and fractal dimension-based three-parameter empirical prediction model is put forward herein, which can effectively assess the dynamic resilience modulus of carbonaceous mudstone coarse-grained soil.

关 键 词：炭质泥岩粗粒土 动态回弹模量 三轴试验 预估模型 

分 类 号：TU411.8[建筑科学—岩土工程]