MA JIN, ZHANG BOTAO, XU XIUQIN, WANG BAOSHENGcom sh a. 1983: MODEL EXPERIMENTAL STUDY ON BEHAVIOR OF DEFORMATION AND ACOUSTIC EMISSION NEAR THE INTERSECTIONS OF FAULTS. Acta Seismologica Sinica, 5(2): 195-206.
Citation: MA JIN, ZHANG BOTAO, XU XIUQIN, WANG BAOSHENGcom sh a. 1983: MODEL EXPERIMENTAL STUDY ON BEHAVIOR OF DEFORMATION AND ACOUSTIC EMISSION NEAR THE INTERSECTIONS OF FAULTS. Acta Seismologica Sinica, 5(2): 195-206.

MODEL EXPERIMENTAL STUDY ON BEHAVIOR OF DEFORMATION AND ACOUSTIC EMISSION NEAR THE INTERSECTIONS OF FAULTS

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  • Published Date: August 31, 2011
  • More than 20 kinds of models, each with two intersecting faults are made from the Changping granite. Gypsum used to simulate the fault material is of thickness 2 mm. The models are loaded under uniaxial stress.Four types of fracture combinations are obtained during the experiments:(1). Shearing and slipping In this case, the model contains two faults dipping in opposite directions, one at an angle of more than 45 to 1 and the other at an angle less than 45 to 1. When gypsum in the fault zones has a moisture content of 10-15% the shearing fracture occurred along the fault starts at. larger angles and then a terminal frictional slip along the fault at smaller angles, takes place. There are two stress drops on the stress-displacement curve. When the gypsum in fault zones has a moisture content of less than 5%, a frictional slip occurs only along the surface of the fault at small angles. There is one stress-drop on the stress-displacement curve.(2). Wedge by compression This happens when the two sets of faults make angles larger than 45 with 1. Its stress-displacement curve rises in the form of steps. The direction of fault dislocation may vary repeatedly.(3). Wedge by tension This happens when the sets of faults make angles less than 30 with 1 There is only one stress drop on the stress-displacement curve.(4). Bi-shearing or Bi-slipping This happens when the two sets of faults make angles of 30 to 45 with 1. There appear two succesive stress drops on the stress-displacement curve.Based on the facts of similarity between the stress-displacement curve and the stress-accumulative number of acoustic emission curve and that between the accumulative acoustic emission number before the principal fracture and the peak stress value during it as well as the relation between acoustic emission and faults, it can be seen that the process of acoustic emission is sensitive to structural conditions.Earthquake precursors possibly appear in the case of different combinations of faults have also been discussed in this paper.
  • [1] C. H. Scholz, t;xperinrental study of the fracturing process in brittle rocks, J. G. X., 73, 1447——1454, 1968.

    [2] 陈颙,不同应力途径三轴压缩下岩石的声发射,地震学报,3, 1, 41——48,1981.

    [3] H. H. Einstein, R. A. Nelson, R. W. Bruhn, R. C. Hirschfeld, Model Studies of Join",ed——Rock BPhav.for from "Rock Mechanics Theory and Practice" ed. by Wiebur FI. Somerton 1970.

    [4] K. Mogi, Study of elastie shocks caused by heterogeneous material and its relations to earthnuake phe——nomena. Bull of Earthq. Res. last, Univ. of Tokyo, 40, part 1, 1962.

    [5] 马瑾等,断层破裂过程与声发射特点的实验研究,地震地质,3, 1, 1981.

    [6] 张四昌,大地震与共骊性构造活动,地震地质,2, 3, 1979,

    [7] 章光月等,在地震孕育和发生过程中共轭断层活动的作用,地震地质,2, 1, 1980.

    [8] 四川省地震局,1976年松潘地震,科学出版社,1979.

    [9] 马瑾等,影响断层带再活动的一些因素的实验研究,西北地震学报,3, 2, 1981,

    [10] J. Handin, On the Coulomb——Mohr failure criterion, J. G. R., 74, 22, 5343——5348, 1969.

    [11] F. A. Donath, Effects of cohesion and granularity. on deformational behavior of anisotropic ruck, Geol. Soc. of Amer. Mem.,135, 95——128, 1972.

    [12] 马宗晋等,中国近年九次强震的构造分类,西北地震学报,2, 1, 1980.

    [1] C. H. Scholz, t;xperinrental study of the fracturing process in brittle rocks, J. G. X., 73, 1447——1454, 1968.

    [2] 陈颙,不同应力途径三轴压缩下岩石的声发射,地震学报,3, 1, 41——48,1981.

    [3] H. H. Einstein, R. A. Nelson, R. W. Bruhn, R. C. Hirschfeld, Model Studies of Join",ed——Rock BPhav.for from "Rock Mechanics Theory and Practice" ed. by Wiebur FI. Somerton 1970.

    [4] K. Mogi, Study of elastie shocks caused by heterogeneous material and its relations to earthnuake phe——nomena. Bull of Earthq. Res. last, Univ. of Tokyo, 40, part 1, 1962.

    [5] 马瑾等,断层破裂过程与声发射特点的实验研究,地震地质,3, 1, 1981.

    [6] 张四昌,大地震与共骊性构造活动,地震地质,2, 3, 1979,

    [7] 章光月等,在地震孕育和发生过程中共轭断层活动的作用,地震地质,2, 1, 1980.

    [8] 四川省地震局,1976年松潘地震,科学出版社,1979.

    [9] 马瑾等,影响断层带再活动的一些因素的实验研究,西北地震学报,3, 2, 1981,

    [10] J. Handin, On the Coulomb——Mohr failure criterion, J. G. R., 74, 22, 5343——5348, 1969.

    [11] F. A. Donath, Effects of cohesion and granularity. on deformational behavior of anisotropic ruck, Geol. Soc. of Amer. Mem.,135, 95——128, 1972.

    [12] 马宗晋等,中国近年九次强震的构造分类,西北地震学报,2, 1, 1980.
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