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冻融循环条件下碳质千枚岩物理力学性质研究
引用本文:蒋钰峰,吴光,刘芳.冻融循环条件下碳质千枚岩物理力学性质研究[J].水文地质工程地质,2018,0(6):114-114.
作者姓名:蒋钰峰  吴光  刘芳
作者单位:1.西南交通大学地球科学与环境工程学院,四川 成都611756;2.西南交通大学希望学院建筑与土木工程系,四川 成都610400
基金项目:中国铁路总公司科技研究开发计划课题(结合工程的科研项目)(2013G014-B)
摘    要:川藏铁路途经川西高海拔变质岩地区,岩石冻融风化强烈,地质灾害多发,开展典型岩石的室内冻融循环试验具有重要的理论意义和工程价值。将采集自金沙江桥位处的碳质千枚岩试样分为5组,选用-40~50 ℃的温差进行周期为8 h(冻、融分别4 h)的冻融循环模拟,每5次冻、融后观察岩样表观变化情况,称取质量并进行超声波波速测试,分别在冻融循环第22,42,65,85,105次后进行单轴抗压强度试验。对取得的各项物理力学指标进行计算分析,结果表明:随着冻融循环次数的增加,岩样表观无明显变化,质量稍有下降且下降速率逐渐降低;冻结后试样纵波波速震荡较大且无明显规律,融解后纵波波速呈下降趋势;试样单轴抗压强度逐渐减小并趋于稳定,岩石表现出脆性减弱而延性增强的特征;岩性对于冻融循环试验结果有重要影响,应当从微裂隙、岩石结构和岩石构造三方面入手进行更多试验以研究岩石冻融损伤机理。

关 键 词:冻融循环    碳质千枚岩    纵波波速    单轴抗压强度    川藏铁路
收稿时间:2018-03-23
修稿时间:2018-07-05

Research on the physical and mechanic properties of carbonaceous phyllite subjected to freezing-thawing cycles
JIANG Yufeng,WU Guang,LIU Fang.Research on the physical and mechanic properties of carbonaceous phyllite subjected to freezing-thawing cycles[J].Hydrogeology and Engineering Geology,2018,0(6):114-114.
Authors:JIANG Yufeng  WU Guang  LIU Fang
Institution:1.Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, Sichuan611756, China; 2.Department of Architecture and Civil Engineering, Hope College of Southwest Jiaotong University, Chengdu, Sichuan610400, China
Abstract:The Sichuan-Tibet Railway passes the high-altitude metamorphic rock areas in western Sichuan, where rocks freeze-thaw and weather intensely, and geological disasters occur frequently. It is of great theoretical significance and engineering value to carry out freezing-thawing cycle tests on typical rocks. Specimens collected at a bridge over the Jinsha River were divided into five groups, and each group experienced 4 h for freezing and 4 h for thawing with a wide temperature range in which the freezing and thawing temperature was -40 ℃ and 50 ℃, respectively. During the experiment, loss of quality, change in P-wave velocity of the carbonaceous phyllite were counted with observing deterioration in the appearance of rock specimens every five freezing-thawing cycles, combining with the uniaxial compression tests after 22, 42, 65, 85, and 105 times of freezing-thawing cycles, respectively. Comparison and analyses of the calculated physical and mechanical parameters show that with the increasing cycles of freezing and thawing, there is no obvious change in the appearance of the rock specimens, the quality decreases slightly and the rate of decline decreases gradually. There is no obvious law of the P-wave velocity with large shock after freezing, but the P-wave velocity shows a decreasing trend after thawing. The uniaxial compressive strength decreases gradually and tends to be steady at last. The carbonaceous phyllite exhibits the characteristics of weakened brittleness and enhanced ductility. The rock properties have an important effect on the experiment. For this reason, more research should be carried out on the three aspects of microfracture, rock structure and rock texture.
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