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总览 评价 尚晓吉 1, , 刘卫群 2,* ( 1、 中国矿业大学力学与建筑工程学院; 2、 中国矿业大学力学与建筑工程学院,江苏 徐州 221116; ) 摘要: 岩石类材料在力学特性等方面具有尺度效应。基于损伤力学理论、Weibull分布假设和脆性材料强度的随机统计
尚晓吉1,, 刘卫群2,*
(
1、中国矿业大学力学与建筑工程学院; 2、中国矿业大学力学与建筑工程学院,江苏 徐州 221116; )
摘要:
岩石类材料在力学特性等方面具有尺度效应。基于损伤力学理论、Weibull分布假设和脆性材料强度的随机统计分布假设,本文采用损伤力学的方法建立了计入端面摩擦效应的单轴/三轴压缩下煤样统计损伤尺度本构模型,之后对一个含4个不同尺度试样的算例进行分析,分析结果与试验结果进行比较表明,该模型与实测结果定性上吻合,验证了本统计损伤尺度本构模型的正确性与合理性。
关键词:
岩石力学;单/三轴压缩;尺度效应;本构模型;残余应力
SHANG Xiaoji1,, LIU Weiqun2,*
(
1、Mechanics & Civil Engineering School, China University of Mining and Technology; 2、Mechanics & Civil Engineering School, China University of Mining and Technology, Xuzhou Jiangsu 221116; )
Abstract:
It is well-known that rock materials have scale effects in the character of mechanic. In this paper, according to the damage mechanics theory, the Weibull's distribution hypothesis and therandom statistical distribution hypothesis of Brittle material strength, new scale constitutive models of rock under uniaxial /Triaxial compression of considering residual stress and not are established respectively; Then, an example of four different scale samples is analyzed; finally, comparative analysis are taken between the theoretical results and the experimental results, which shows they are in good agreement. Therefore, the accuracy and reasonableness of the statistical scale damage constitutive model is verified.
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