高应变率下饱水冻结红砂岩变形破坏分析

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摘要

以白垩系红砂岩为研究对象，利用SHPB动态冲击试验，研究低温状态下红砂岩的变形破坏和能量传递规律，分析不同程度负温对岩石强度性能、损伤变量及能量耗散规律的影响；通过引入分形维数D，建立冻结红砂岩块度分形计算模型，探究块度分形维数与破碎断裂能之间的关系。研究结果表明，饱水红砂岩在低温状态下的动态强度随温度降低(25 ℃～－40 ℃)呈先增大后减小的趋势，这与单轴实验中岩石强度随温度降低逐渐增大的趋势有着较大的差异，而随着温度的降低，红砂岩张拉破裂面积先增大而减小，这说明饱水冻结红砂岩破坏模式由张拉破坏向剪切破坏逐步过渡；冻结岩石试件的宏观破坏与破碎断裂能有着密切的关系，破碎断裂能越大，破碎体数量越多，岩石破坏越严重，而破碎断裂能与分形维数D正相关，破碎过程中耗散的断裂能越多，相应的分形维数就越大，但分形维数D随破坏断裂能增加的速率逐渐放缓。

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	杨阳1
	王建国2
	杨仁树3
	方士正3
	张念念3
	郭延辉2

关键词 ：岩石力学, 低温冻结, 霍普金森压杆, 损伤变量, 分形维数, 破碎断裂能

Abstract：

In order to study the energy transfer rule and deformation regularity of the cretaceous red sandstone，dynamic impact compression test was implemented by 75 mm large diameter SHPB experimental device，the influence of negative temperature change on dynamic strength performance，damage variable and the law of energy dissipation has been analyzed. Meanwhile，the fractal dimension D is introduced to set up the frozen red sandstone blocks broken fractal calculation model，and the relationship between fractal dimension D and fracture energy could be revealed. The results show that dynamic strength of saturated red sandstone under low temperature firstly increases and then decreases with the temperature reduction(25℃–－40℃)，it is very different from the uniaxial experiment results. With the temperature reduced，the tensile fracture area of red sandstone increased initially and then decreased，which indicates that the failure mode is gradually transitioning from tensile failure to shear failure. There is a close relationship between macroscopic failure characteristics and energy absorption，the greater the dissipated energy，the more serious the rock damage. The fracture energy is positively related to the fractal dimension D，the more fracture energy during the process of crushing，the more serious the damage degree，and the number value of corresponding fractal dimension D is bigger，but the growth rate of fractal dimension D is gradually slowing down with the increase of fracture energy .

Key words： rock mechanics low temperature freezing split Hopkinson pressure bar(SHPB) damage variable fractal dimension fracture energy

引用本文:

杨阳1，王建国2，杨仁树3，方士正3，张念念3，郭延辉2. 高应变率下饱水冻结红砂岩变形破坏分析[J]. 岩石力学与工程学报, 2018, 37(S2): 4016-4026.
YANG Yang1，WANG Jianguo2，YANG Renshu3，FANG Shizheng3，ZHANG Niannian3，GUO Yanhui2. Analysis of deformation and fracture of the saturated frozen red sandstone under high strain rate. , 2018, 37(S2): 4016-4026.

链接本文:

https://rockmech.whrsm.ac.cn/CN/Y2018/V37/IS2/4016

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