岩质边坡坡率与滑动面倾角对锚固效果的影响

Influences of Slope Rate of Rock Slope and InclinationAngle of Sliding Surface on Anchoring Effect

以含结构面的岩质边坡为例,首先采用ANSYS进行建模与网格划分;之后使用FLAC^3D软件内置接触面语句,建立固定的滑动面倾角;最后采用强度折减法求解边坡的安全系数。通过对理论公式的推导与数值模拟结果的拟合,得出如下结论:①在岩质边坡中,通过理论推导,将最优锚固角定义为锚杆自由段承受最大抗滑力时所对应的锚固角。②当坡率固定时,锚固角与安全系数呈负相关关系,随着锚固角增大,安全系数逐渐减小;当滑动面倾角固定时,在最优锚固角状态下,边坡的安全系数随着边坡坡率的增大而减小。③当滑动面倾角固定时,锚固角与安全系数呈负相关关系,随着锚固角的增大,安全系数逐渐减小;当坡率固定时,在最优锚固角状态下,随着边坡滑动面倾角的增大,安全系数先减小后增大。

The influences of slope rate of rock slope and inclination angle of sliding surface on anchoring effect are investigated in this paper.ANSYS is employed used for modeling and meshing of rock slope with structural plane;FLAC^3D is used to build a known inclination of sliding surface;and finally,strength reduction method is adopted to solve the safety factor of the slope,and the functional relation between anchoring angle and safety factor in the presence of varied slope rate and inclination of sliding surface was obtained.Through fitting of the theoretical formula and the numerical simulation results,we conclude that:(1)In rock slope,through theoretical deduction,the optimal anchorage angle is defined as the anchorage angle corresponding to the maximum anti-sliding force in the free section of the anchor.(2)When the slope rate is known,anchorage angle is in a negative correlation with safety factor,which suggest that safety factor decreases gradually with the increase of anchorage angle.When the inclination angle of sliding surface is known,the safety factor of slope declines with the increase of slope rate in the presence of the optimum anchorage angle.(3)When the inclination angle of sliding surface is known,anchorage angle has a negative correlation with safety factor,implying that safety factor reduces gradually with the augment of anchorage angle.When slope ratio is known,safety factor drops first and then rises with the increase of inclination angle in the presence of the optimum anchorage angle.