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汪鑫,郑达,吴鑫泷,等. 冻融循环条件下英安岩损伤劣化力学机理研究[J]. 科学技术与工程, 2021, 21(24): 10421-10429.
Wang Xin,Zheng Da,Wu Xinlong,et al.Mechanical mechanism of dacite deterioration under freeze and thaw[J].Science Technology and Engineering,2021,21(24):10421-10429.
冻融循环条件下英安岩损伤劣化力学机理研究
Mechanical mechanism of dacite deterioration under freeze and thaw
投稿时间:2021-02-03  修订日期:2021-06-06
DOI:
中文关键词:  冻融作用  英安岩  矿物分析  细观结构  损伤劣化
英文关键词:freeze and thaw  dacite  mineral composition  meso-structure  degradation
基金项目:国家重点研发计划(2018YFC1504905);国家自然科学基金资助项目(41772317);国家重点实验室自主课题(SKLPG2020Z008)
           
作者单位
汪鑫 成都理工大学
郑达 成都理工大学
吴鑫泷 中国华西工程设计建设有限公司
姚青 河南省交通规划设计研究院股份有限公司
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中文摘要:
      岩石的变形及破坏是高寒地区较为常见的工程地质问题,为了揭示岩石在冻融环境下的损伤及变形破坏演化深层规律,本文选取西藏如美水电站中坝址右岸出露的英安岩为研究对象进行深入分析。首先利用SEM-EDS对英安岩进行矿物成分分析,随后开展单轴压缩试验并结合相关、偏相关分析确定对试样力学特性影响最大的矿物成分。通过模拟研究区真实的冻融环境开展冻融循环试验,结合不同冻融次数下试样物理性质及细观结构的变化情况进行深入分析并采用数值仿真模拟重现冻融循环过程中试样内部温度及应力应变的演化特征,揭示英安岩冻融损伤劣化的力学机理。研究结果表明:英安岩呈现脆性破坏主要是由斜长石和石英的损伤劣化所引起的,其中斜长石和石英矿物晶体间产生的脆性裂纹以及两者游离态晶体颗粒的析出是英安岩劣化微裂隙扩展的关键因素,沿石英和斜长石晶体晶界结构所产生的脆性断裂是英安岩细观损伤延伸扩展的主要形式。数值模拟结果发现,冻融循环过程中英安岩内部的温度变化响应及分布形态主要受细观结构控制,裂隙端部所产生的拉应力及剪应力集中区是裂隙延伸扩展的力学基础。
英文摘要:
      Rock deformation and failure are common engineering geological problems in Alpine regions. In order to reveal the deep law of rock deformation and damage under freeze-thaw conditions, the dacite exposed on the right bank of the middle dam site of Rumei Hydropower Station of Tibet had been taken as the research object. First, the mineral composition of dacite had been analyzed based on SEM-EDS, and the mineral composition that has the significant influence on the mechanical properties of decite had been determined by uniaxial compression tests and the correlation and partial correlation analysis. The freeze-thaw cycle tests had been performed by simulating the real freeze-thaw environment in the study area to analyze the changes in the physical properties and the mesostructured inner the dacite under different freeze-thaw tests. Numerical simulation has been used to reproduce the the internal temperature and stress evolution during the freeze-thaw cycles. The results show that: Plagioclase and quartz are the basis of brittle failure in dacite; The brittle cracks appeared between plagioclase and quartz crystals and the precipitation of free plagioclase crystals and quartz crystals is the basis of dacite's deteriorated micro-crack expansion; The brittle fracture along the crystal boundary of quartz and plagioclase is the main form of microscopic damage extension; Numerical simulation results show that: The distribution characteristics of the meso-structure are the main factors affecting the temperature distribution in the rock; The tensile stress and shear stress concentration area generated at the end of the crack are the mechanical basis of the crack extension.
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