氯化钠溶液腐蚀板岩蠕变特性及改进H|M模型研究  

Research on slate creep experiment and a modified H|M model in NaCl solution corrosion

作　　者：江宗斌[1] 姜谙男[1] 李宏[2] 

机构地区：[1]大连海事大学道桥研究所,辽宁大连116026 [2]大连理工大学岩石破裂与失稳研究中心,辽宁大连116026

出　　处：《岩石力学与工程学报》2016年第A02期3725-3733,共9页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(51678101);中央高校基本科研业务费专项资金资助(3132014326);国家基础研究发展计划(973)项目(2011CB013503)~~

摘　　要：针对海水腐蚀板岩蠕变研究缺乏的现状,以大连地铁板岩为对象,开展Na Cl溶液腐蚀蠕变试验和模型的研究。首先进行板岩的Na Cl溶液浸泡试验,从细观角度,通过SEM电镜扫描图像和EDS能谱元素的对比,并结合纵波波速和p H值分析,揭示不同浸泡时间板岩试件腐蚀特性。然后通过RLW–2000岩石力学三轴流变系统开展蠕变试验,从宏观角度分析不同腐蚀条件下试件瞬时变形、初始段、稳定段和加速段的蠕变曲线和特征。总结长期强度、蠕变速率、弹性模量随浸泡时间的变化规律。最后基于试验结果,提出考虑化学损伤的五元件非线性黏弹塑性蠕变模型(H|M-CD模型),并利用1st Opt优化软件对模型参数进行辨识。研究结果表明,Na Cl溶液的腐蚀作用改变了板岩的蠕变力学特性,随着浸泡时间的增加,加速段速率增大,蠕变时间缩短。浸泡时间越长,破坏特征越明显。模型理论曲线与试验曲线在3个阶段吻合较好,说明所提出的H|M-CD模型可准确描述腐蚀板岩蠕变全过程。研究结果为板岩岩石工程在海水环境中的长期稳定性评价提供了参考和依据。Due to the status that lack of researches on seawater corrosion slate creep,with Dalian Metro as study object,the Na Cl solution corrosion-creep experiment and model research are carried out. Firstly,the experiment of slate immersion in Na Cl solution is performed. By contrast of SEM images and EDS elements from mesoscopic perspective,and combination of longitudinal wave velocity and p H value analysis,the test specimen＇s corrosion characteristics with different immersion periods are revealed. Then,by RLW–2000 rock mechanics triaxial rheological system,creep experiment is carried out,and the test specimen＇s creep curve and characteristics in immediate deformation,initial phase,stable phase and acceleration phase are analyzed from macroscopic perspective. The long-term strength,creep rate,and elasticity modulus＇ change rule with different immersion periods are summarized. Finally,based on experiment results,introducing a five-component nonlinear viscoelastoplastic rheological model（H｜M-CD model） with consideration of chemical corrosion,and the model parameter recognition is realized by 1st Opt optimization software. The research results indicate that Na Cl solution＇s corrosiveness has changed slate＇s creep mechanics properties, with the increase of immersion time, the acceleration phase＇s speed increases,and creep time shortens. The longer the immersion time is,the obvious the damage feature becomes. The model theory curve accords with experiment curve in three phases,and indicates that the model H｜M-CD proposed above is capable to describe the whole creep process of corrosion slate. The research results provide reference and basis for long-term stability evaluation on slate rock engineering in seawater environment.

关 键 词：岩石力学 氯化钠 化学腐蚀 板岩 蠕变 改进H|M模型 

分 类 号：TU45[建筑科学—岩土工程]