干湿和冻融循环作用下泥质白云岩宏观劣化  

Macro Degradation of Argillaceous Dolomite under the Dry-wet Cycles and Freeze-thaw Cycles

作　　者：黄武峰 刘鹏程 郭建强 蒋建国 陈建行 黄秀银 陈旭 HUANG Wu-feng;LIU Peng-cheng;GUO Jian-qiang;JIANG Jian-guo;CHEN Jian-hang;HUANG Xiu-yin;CHEN Xu(College of Civil Engineering,Guizhou University,Guiyang 550025,China;Guizhou United Win Civil Engineering Detecting and Monitoring Co.,Ltd.,Guiyang 550025,China)

机构地区：[1]贵州大学土木工程学院,贵阳550025 [2]贵州联建土木工程质量检测监控中心有限公司,贵阳550025

出　　处：《科学技术与工程》2020年第2期747-754,共8页Science Technology and Engineering

基　　金：国家自然科学基金创新群体基金(50921063);贵州省科学技术基金项目(黔科合J字[2015]2037号)。

摘　　要：水岩相互作用是岩土工程及相关学科的研究热点。通过干湿和冻融循环试验,对泥质白云岩力学特性的劣化规律及扩容进行研究。研究结果表明:泥质白云岩在干湿和冻融循环作用下均会出现明显不均匀的强度劣化,循环次数为60时,干湿循环比冻融循环对岩石的影响更大;循环次数为60时,冻融循环作用下岩样的抗压强度总劣化度会随围压的增大而增大;干湿和冻融循环作用下,屈服应力、扩容点应力与峰值应力的比值与围压呈线性上升关系;循环次数为60时,低围压下,干湿循环岩样的泊松比大于冻融循环下岩样的泊松比;高围压下,冻融循环岩样的弹性模量大于干湿循环岩样的弹性模量。Water-rock Interaction is a hot topic in geotechnical engineering and related disciplines.The deterioration of mechanical properties and rock dilatancy of argillaceous dolomite were studied by dry-wet and freeze-thaw cycle tests.The following conclusions are drawn through the analysis of the test results.①The strength deterioration of the argillaceous dolomite is obviously uneven under the action of dry-wet and freeze-thaw cycle.②Under 60 cycles,dry-wet cycle has a greater impact on rocks than freeze-thaw cycle.The total deterioration of the compressive strength of rock samples subjected to 60 freeze-thaw cycles will increase with increasing in confining pressure.③Under the action of dry-wet and freeze-thaw cycles,the stress ratio between the yield point(dilantancy point)and the peak point-confining pressure show a significant linear correlation.④Under sixty times cycles test,when confining pressure is low,poisson s ratio of dry-wet cyclic sample is greater than poisson s ratio of freeze-thaw cyclic sample.When confining pressure is high,modulus of deformation of freeze-thaw cyclic sample is greater than modulus of deformation of dry-wet cyclic sample.

关 键 词：泥质白云岩 水-岩相互作用 干湿循环 冻融循环 强度劣化 

分 类 号：TU452[建筑科学—岩土工程]