摘要
干湿循环作用将对固化淤泥土造成持续的侵蚀和劣化效应。基于无侧限抗压强度试验和固结试验等宏观试验方法,和电镜扫描分析、压汞孔隙分析和氮吸附孔隙分析等微细观分析手段,探索了干湿循环作用下固化淤泥土的宏观指标衰减规律和微细观侵蚀特征。宏观试验结果表明:经历18次干湿循环作用,固化淤泥土的初始孔隙比降低10%,无侧限抗压强度降低13%,弹性模量降低62%,破坏应变增加1.12倍,压缩模量减小32%。微细观分析结果表明:固化骨架被侵蚀成蜂窝状,固化骨架与填充其间的黏土颗粒发生剥离而产生微裂隙,黏土颗粒发生重组和扩容。固化骨架因为黏土颗粒的剥离和重组而失去支撑,是固化淤泥土干湿循环劣化的主要驱动来源。
Stabilized/Solidified(S/S)sediments are supposed to be eroded and deteriorated by dry-wet circles.Based on macroscopic test methods such as unconfined compression strength(UCS)test and oedometer test,and microscopic analysis methods such as electron microscope scanning analysis(SEM),mercury intrusion porosimetry(MIP)and nitrogen adsorption porosimetry(NAP),macroscopic indexes reducing principles and microscopic erosion characters of S/S sediments under dry-wet circulations was explored.Macroscopic test results show that:when S/S sediments experience 18 dry-wet circles,initial void ratio decreases 10%,UCS decreases 13%,elastic modulus decreases 62%,failure strain increases 1.12 times,and compression modulus decreases 32%.Microscopic analysis results show that:solidification skeletons are eroded to be cellular,micro cracks develop at the interfaces between solidification skeletons and soil particles,soil particles are reconstructed and expanded.The primary driving force of S/S sediments’deterioration in dry-wet circles is solidification skeletons’support loss due to soil particles’exfoliation and reconstruction.
作者
汪洪星
柯睿
谈云志
吴军
黄龙波
WANG Hong-xing;KE Rui;TAN Yun-zhi;WU Jun;HUANG Long-bo(The Institute of Problematic Soils Mechanics,China Three Gorges University,Yichang 443002,China;Key Laboratory of Geological Hazards on Three Gorges Reservoir Area,Ministry of Education,China Three Gorges University,Yichang 443002,China)
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2018年第9期2704-2709,共6页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金(51709154)
湖北省优秀中青年科技创新团队计划项目(T201803)
三峡大学硕士论文培优基金(2018SSPY026)
关键词
固化淤泥土
干湿循环
劣化特征
固化骨架侵蚀
黏土颗粒剥离
微细观孔隙扩容
Solidified/Stabilized sediments
dry-wet circle
deterioration character
solidification skeleton erosion
soil particles exfoliation
micro pore expansion
