摘要
【目的】城市生活垃圾焚烧炉渣(municipal solid waste incineration,MSWI)是生活垃圾焚烧后产生的一种高密实颗粒状材料。本文研究MSWI应用于路基材料时的强度和变形等力学特性。【方法】分别开展MSWI的材料特性分析,MSWI的三轴剪切应力-应变分析,以及基于离散元PFC2D软件的MSWI循环三轴荷载模拟分析。【结果】MSWI的材料特性满足路基填筑要求。在室内三轴剪切试验中,MSWI峰值强度随着围压的增加不断提高;而随含水率的增加,先增大后减小。MSWI的抗剪强度指标内摩擦角为34.75°,黏聚力为54.13 kPa,满足作为路基材料的要求。同时基于PFC^(2D)分析围压、偏应力对MSWI循环荷载永久变形的影响规律:随着围压的增大,轴向应变逐渐减小;随着偏应力的增大,轴向应变逐渐增加。【结论】MSWI应用于路基填筑具有可行性,本文结果可为后续研究MSWI工程应用提供参考。
[Purposes]Municipal solid waste incineration(MSWI)is a kind of highly dense granular material produced after domestic waste incineration.This work aims to study the strength and deformation characteristics of MSWI applied as subgrade materials.[Methods]The characteristics of MSWI are investigated by laboratory triaxial shear stress-strain test and cyclic triaxial load simulation based on discrete element PFC2D.[Findings]The mechanical characteristics of the MSWI generally meet the requirements of subgrade filling.In the triaxial shear test,the peak strength of MSWI increased with the enhancement of confining pressure;With the increase of water content,the shear strength increased at first and then decreased.The measured internal friction angle of the MSWI index is 34.75°,and the cohesion is 54.13 kPa,which meets the parameters required by subgrade materials.At the same time,based on PFC^(2D)model,the influence of confining pressure and deviator stress on the permanent deformation of MSWI under cyclic load is analyzed.It is concluded that with the increase of confining pressure,the axial strain gradually decreases,while with the rising deviator stress,the axial strain increases gradually.[Conclusions]The application of MSWI as subgrade filling has certain feasibility,which provides a reference for further study on the engineering application of MSWI.
作者
黄钰程
孙金钊
田盎然
唐强
HUANG Yucheng;SUN Jinzhao;TIAN Angran;TANG Qiang(School of Rail Transportation,Soochow University,Suzhou 215131,China)
出处
《长沙理工大学学报（自然科学版）》
CAS
2023年第1期32-39,共8页
Journal of Changsha University of Science and Technology:Natural Science
基金
国家自然科学基金项目(52208360)
江苏省自然科学基金项目(BK20210720)
江苏省高等学校自然科学研究项目(19KJB580018)。
作者简介
通信作者:唐强(1985-)(ORCID:0000-0003-2751-2455),男,教授,主要从事岩土工程方面的研究。E-mail:tangqiang@suda.edu.cn。
