反倾似层状硬质岩体边坡倾倒变形响应规律研究

Study on the Dumping Deformation Response Law of a Anti-dip Layered Hard Rock Slope

倾倒变形常见于软硬岩互层状岩石边坡,对于一定坡面结构面产状条件下的似层状硬质岩体边坡,也可产生倾倒变形。通过对坡度、结构面倾角及坡面与结构面走向夹角3个因素作用下的324种组合形式边坡进行数值模拟研究,选择坡面多点位移作为倾倒变形程度评价指标,探讨3个因素作用下的三维反倾边坡倾倒响应规律。通过分析对比发现:随倾角增加易倾倒变形区域位置呈现类"C"状折线变化,在倾角60°左右坡面坡角对边坡倾倒的控制作用相对最小,而走向夹角的控制作用相对最大;当走向夹角自-20°增至20°,易倾倒区域先呈沿近+X轴方向不断移动并扩展再沿近-X轴方向不断移动并收缩;在坡角变化下,易倾倒区域位置稳定,都集中在结构面倾角55°~70°,走向夹角约为0°。

Dumping deformation is common in soft and hard interbedded slope,and it can also occur in layered hard rock slope under certain slope and structural plane conditions.324 combined forms of slopes were numerically simulated under the effects of slope angle,inclination angle of structural plane,as well as included angle between slope and structural plane strike.Multipoint displacement of slope was selected as the evaluation index of dumping deformation,and the response law of threedimensional anti-dip slope under the effects of three factors was discussed.Through analysis and comparison,it is found that,with the increase of inclination angle,the location of prone dumping deformation area presents a"C"-like polyline change.At the inclination angle of 60°or so,the slope angle has the least control effect on slope dumping,while the strike angle has the greatest control effect.When the included angle between slope and structural plane strike increases from-20°to 20°,the prone dumping deformation area firstly moves and expands along the near+X-axis direction and then moves and contracts along the near-X-axis direction.Under the change of slope angle,the locations of dumping areas are stable and concentrate in the area with inclination angle of structure plane of 55°~70°and included angle of 0°or so.