CHEN Liwei, PENG Jianbing, SUN Ping. 2007: ANALYSES OF WALLS CRACKING FORMS OVER GROUND FISSURES. JOURNAL OF ENGINEERING GEOLOGY, 15(3): 407-411.
    Citation: CHEN Liwei, PENG Jianbing, SUN Ping. 2007: ANALYSES OF WALLS CRACKING FORMS OVER GROUND FISSURES. JOURNAL OF ENGINEERING GEOLOGY, 15(3): 407-411.

    ANALYSES OF WALLS CRACKING FORMS OVER GROUND FISSURES

    • The author in this paper analyzed the cracking forms of walls over ground fissures with non-linear finite element method.The originated position,dip direction,dip angle and later mode of the cracks on walls are accomplished when the walls crossing over ground fissures with three-dimensional activity,and the changing law varying with different ratio of sedimentation and tensor are got.The results show that,there are two types of cracks generating on walls: the vertical cracks on top of walls located in footwall and the skew cracks at the bottom of walls just above ground fissures.The dip direction of the skew cracks is opposite to that of ground fissures.When the activity of ground fissures is mainly the tensor,the skew cracks at the bottom of walling expand upward with high angel;but when the activity is mainly the sedimentation,then the skew cracks expand upward with low angel.The walls could be broken so long as there was minute dislocation,generally 2~3 mm distance,occurred to the ground fissures.And the cracks expand quickly that several millimeters dislocation can make the cracks expand tens of centimeters,even finally breakthrough the walls.At the early developmental stage,the skew cracks are relatively flat,but with the quick expansion of cracks,the dip angles become lower.The later mode of the cracks likes a flexural arc.
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