含转折非连通断层岩石破坏过程的试验研究
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摘要
以数字散斑相关方法(DSCM)为手段,对含有转折非连通断层岩石破坏过程进行了试验研究。研究了岩石破坏过程中的试件表面的变形场演化过程。通过DSCM系统观测加载过程中的散斑图像,分析得到各个时刻的位移场及应变场,试验结果反映了转折非连通断层变形破坏的整个过程。结果表明,变形最初集中在岩石的弱性结构面上,并且变形破坏过程也受弱性面控制,裂纹尖端为应力集中程度最高的区域,新裂纹从这里产生并扩展,最后导致整个结构的破坏。利用变形场统计指标Cv值分析发现,该值在岩石均匀变形阶段变化较为缓慢,在岩石破坏前迅速上升,因此,可以利用Cv值对岩石破坏进行预测。
The failure process of a rock with tortuously non-connected fault was experimentally studied using the digital speckle correlation method.The evolution of the deformation field during failure was studied.The DSCM system captured speckle images during the test process and then the deformation field at various moments was obtained.Experimental results show that deformation initially focuses on the weak structure of the rock surface and the failure process is also affected by the weak surface.Stress concentration locates at the crack tip and the new cracks generate and expand from there,finally leads to the whole structure damage.The statistical indication of deformation field,Cv value changes slightly during the homogenous deformation stage and increases rapidly before the rock failure,the Cv value can then be used as the prediction of the rock failure.
The failure process of a rock with tortuously non-connected fault was experimentally studied using the digital speckle correlation method.The evolution of the deformation field during failure was studied.The DSCM system captured speckle images during the test process and then the deformation field at various moments was obtained.Experimental results show that deformation initially focuses on the weak structure of the rock surface and the failure process is also affected by the weak surface.Stress concentration locates at the crack tip and the new cracks generate and expand from there,finally leads to the whole structure damage.The statistical indication of deformation field,Cv value changes slightly during the homogenous deformation stage and increases rapidly before the rock failure,the Cv value can then be used as the prediction of the rock failure.
引文
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[5]张晖辉,颜玉定,余怀中,等.循环载荷下大试件岩石破坏声发射实验———岩石破坏前兆的研究[J].岩石力学与工程学报,2004,23(21):3621-3628.
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[9]王建国,王振伟,马少鹏.循环载荷作用下岩石材料变形场演化试验研究[J].岩石力学与工程学报,2009,28(s2):3336-3341.
[10]马少鹏,王来贵,赵永红.岩石圆孔结构破坏过程变形场演化的实验研究[J].岩土力学,2006,27(7):1082-1086.
[11]王凯英,马胜利,刘力强,等.地震前兆时时空非均匀性指标Cv值的实验检验[J].地震学报,2002,24(1):82-89.
[2]姜洪波.单轴压缩条件下花岗岩变形特征研究[J].有色矿治,2011,27(1):16-17.
[3]吕森鹏,陈卫忠,贾善坡,等.脆性岩石破坏试验研究[J].岩石力学与工程学报,2009,28(s1):2772-2777.
[4]胡盛斌,邓建,马春德,等.循环荷载作用下含缺陷岩石破坏特征试验研究[J].岩石力学与工程学报,2009,28(12):2490-2495.
[5]张晖辉,颜玉定,余怀中,等.循环载荷下大试件岩石破坏声发射实验———岩石破坏前兆的研究[J].岩石力学与工程学报,2004,23(21):3621-3628.
[6]陈俊达,马少鹏,刘善军,等.应用数字散斑相关方法实验研究雁列断层变形破坏过程[J].地球物理学报,2005,48(6):1350-1356.
[7]马文涛,马谨,刘力强,等.雁列断层变形过程中的声发射特征[J].地震地质,1995,17(4):342-348.
[8]马少鹏,周辉.岩石破坏过程中试件表面应变场演化特征研究[J].岩石力学与工程学报,2008,27(8):1667-1673.
[9]王建国,王振伟,马少鹏.循环载荷作用下岩石材料变形场演化试验研究[J].岩石力学与工程学报,2009,28(s2):3336-3341.
[10]马少鹏,王来贵,赵永红.岩石圆孔结构破坏过程变形场演化的实验研究[J].岩土力学,2006,27(7):1082-1086.
[11]王凯英,马胜利,刘力强,等.地震前兆时时空非均匀性指标Cv值的实验检验[J].地震学报,2002,24(1):82-89.
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