典型横截面形状岩石抗压强度和变形行为的数值模拟
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摘要
为了研究典型横截面形状对岩石在单轴压缩荷载作用下的强度和变形行为的影响,分别对横截面形状为圆形、正方形和长方形的岩石试件在3种不同高径比下的单轴压缩强度与变形特征进行模拟。结果表明:相同面积不同横截面形状对岩石试件峰值强度影响不明显,但都呈现出随着高径比增加而峰值强度降低的规律。但是,横截面形状会明显影响岩石的峰后行为,圆形横截面试件峰后脆性最低,长方形横截面试件峰后脆性最高。
In order to investigate the influence of typical cross-sectional shape on the strength and deformation behaviors of rocks,a numerical experiment is carried out to simulate the strength and deformation responses of circular,square,and rectangular sectionally shaped specimens in uniaxial compression loads with three different ratio of height to diameter.The results show that the rocks with same area and different cross-sectional shape have nearby uniaxial compression strengths and the law of strength reduction with increasing high diameter ratios.However,the cross-sectional shape affects the post-peak behaviors of rocks considerably.The circular shaped specimen has the lowest brittleness,but the rectangle shaped specimen has the highest brittleness.
In order to investigate the influence of typical cross-sectional shape on the strength and deformation behaviors of rocks,a numerical experiment is carried out to simulate the strength and deformation responses of circular,square,and rectangular sectionally shaped specimens in uniaxial compression loads with three different ratio of height to diameter.The results show that the rocks with same area and different cross-sectional shape have nearby uniaxial compression strengths and the law of strength reduction with increasing high diameter ratios.However,the cross-sectional shape affects the post-peak behaviors of rocks considerably.The circular shaped specimen has the lowest brittleness,but the rectangle shaped specimen has the highest brittleness.
引文
[1] 杨圣奇,苏承东,徐卫亚.岩石材料尺寸效应的试验和理论研究[J].工程力学,2005(4):112-118.
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[4] 潘一山,魏建明.岩石材料应变软化尺寸效应的实验和理论研究[J].岩石力学与工程学报,2002(2):215-218.
[5] 梁正召,唐春安,张娟霞,等.岩石三维破坏数值模型及形状效应的模拟研究[J].岩土力学,2007(4):699-704.
[6] 孙超,刘芳,蒋明镜,等.岩石抗压强度的尺寸效应及端部约束的离散元数值模拟[J].岩石力学与工程学报,2014,33(S2):3421-3428.
[7] 尤明庆,邹友峰.关于岩石非均质性与强度尺寸效应的讨论[J].岩石力学与工程学报,2000(3):391-395.
[8] 尤明庆,华安增.岩样单轴压缩的尺度效应和矿柱支承性能[J].煤炭学报,1997(1):39-43.
[9] 吕兆兴,冯增朝,赵阳升.岩石的非均质性对其材料强度尺寸效应的影响[J].煤炭学报,2007(9):917-920.
[10] 周勇,王涛,吕庆,等.基于FLAC3D岩石应变软化模型的研究[J].长江科学院报,2012,29(5):51-56,61.
[11] 康亚明,贾延,罗玉财,等.三轴压缩时岩石破裂面方位角理论值与实验值研究[J].西安建筑科技大学学报(自然科学版),2017,49(5):665-670.
[12] 王学滨.岩石变形局部化的FLAC数值模拟[D].阜新:辽宁工程技术大学,2002.
[2] HUDSON J A,CROUCH S L,FAIRHURST C.Soft,stiff and servo-controlled testing machines;a review with reference to rock failure[J].Engineering Geology,1972,6(3):155-189.
[3] 王学滨,潘一山,杨小彬.准脆性材料试件应变软化尺度效应理论研究[J].岩石力学与工程学报,2003(2):188-191.
[4] 潘一山,魏建明.岩石材料应变软化尺寸效应的实验和理论研究[J].岩石力学与工程学报,2002(2):215-218.
[5] 梁正召,唐春安,张娟霞,等.岩石三维破坏数值模型及形状效应的模拟研究[J].岩土力学,2007(4):699-704.
[6] 孙超,刘芳,蒋明镜,等.岩石抗压强度的尺寸效应及端部约束的离散元数值模拟[J].岩石力学与工程学报,2014,33(S2):3421-3428.
[7] 尤明庆,邹友峰.关于岩石非均质性与强度尺寸效应的讨论[J].岩石力学与工程学报,2000(3):391-395.
[8] 尤明庆,华安增.岩样单轴压缩的尺度效应和矿柱支承性能[J].煤炭学报,1997(1):39-43.
[9] 吕兆兴,冯增朝,赵阳升.岩石的非均质性对其材料强度尺寸效应的影响[J].煤炭学报,2007(9):917-920.
[10] 周勇,王涛,吕庆,等.基于FLAC3D岩石应变软化模型的研究[J].长江科学院报,2012,29(5):51-56,61.
[11] 康亚明,贾延,罗玉财,等.三轴压缩时岩石破裂面方位角理论值与实验值研究[J].西安建筑科技大学学报(自然科学版),2017,49(5):665-670.
[12] 王学滨.岩石变形局部化的FLAC数值模拟[D].阜新:辽宁工程技术大学,2002.