岩土力学2024，Vol.45Issue(7)：1895-1905,11.DOI:10.16285/j.rsm.2023.1345
不同垫层下煤矸石桩网复合路基承载特性
Bearing characteristics of coal gangue pile-net composite embankment with different cushion layers
摘要
Abstract
In order to comprehensively utilize solid waste coal gangue,coal gangue concrete piles were prepared by replacing part of traditional fine aggregate.Laboratory model tests of coal gangue pile-net composite embankments under reinforced cushions of geocells and geogrids were conducted to analyze the differences in load-settlement relationships of the embankment top surface,load transfer capabilities of the reinforced cushions,and stress distributions within the piles.Additionally,a finite element calculation model was established to investigate the stress and deformation patterns of different reinforcing materials,revealing the mechanism of geocells applied in reinforced cushions.The results indicate that,in this test,compared to geogrids,the geocell reinforced cushion significantly reduced the settlement of the embankment top by approximately 29.71％.Under the geocell reinforced cushion,the attenuation of soil pressure at the top of the piles and between piles was approximately 61.51％and 56.35％,respectively,fully utilizing the raft effect and stress diffusion effect.When using a geocell reinforced bedding,the embankment load was more effectively transferred to the coal gangue piles,with the extreme values of pile stress at the center of the roadbed and along the cross-section of the roadbed being 1.78 and 1.80 times greater,respectively,than those using geogrid reinforced bedding.The stress distributions of geocells and geogrids exhibited"V"-shaped and"U"-shaped patterns,respectively,and the maximum stress value of geocells was greater than that of geogrids.The unique honeycomb structure of the geocell exerts lateral hoop and rib friction resistance on the embankment fill,effectively diffusing the embankment load through its own tension and deformation.关键词
桩网复合路基/煤矸石桩/土工格室/加筋垫层荷载传递/桩身应力Key words
pile-net composite embankment/coal gangue pile/geocell/load transfer of reinforced cushion/pile stress分类
建筑与水利引用本文复制引用
邓友生,姚志刚,冯爱林,李龙,孟丽青,肇慧玲..不同垫层下煤矸石桩网复合路基承载特性[J].岩土力学,2024,45(7):1895-1905,11.基金项目
国家自然科学基金项目(No.51878554,No.41672308) （No.51878554,No.41672308）
陕西省自然科学基础研究计划重点项目(No.2018JZ5012).This work was supported by the National Natural Science Foundation of China(51878554,41672308)and the Key Projects of Shaanxi Natural Science Basic Research Program(2018JZ5012). （No.2018JZ5012）
