含多裂隙岩质边坡稳定性分析

Stability Analysis of Rock Slope with Multiple Cracks

基于FLAC^3D数值计算软件,采用理想弹塑性本构模型及节理单元对含多裂隙岩质边坡的稳定性进行了分析,并研究了多裂隙长度、倾角、间距、排距及副裂隙长度对岩质边坡的临界滑面和边坡安全系数的影响。结果表明,随着裂隙长度的增加,临界滑面会随着长度的变化而发生改变,边坡安全系数也会随之明显降低;在裂隙分布较密时,裂隙之间的相互作用会影响临界滑面的形成,但当间距或排距不断增大时,其影响越来越不明显;岩质边坡的安全系数会随着裂隙倾角的变化呈开口向上的抛物线规律变化,当倾角与边坡角度相近时,边坡安全系数达到最小值;当裂隙为交叉裂隙时,其对临界滑面和边坡安全系数也会产生一定影响,说明裂隙的形状也是影响边坡稳定性的一个重要因素。

Based on the numerical calculation software FLAC3D,the stability of rock slope with multiple cracks was analyzed by using ideal elastic-plastic constitutive model and joint element,and the effects of crack length,dip angle,interval,row spacing and secondary crack length on critical slip surface and safety factor of rock slope were studied.The calculation results were concluded as follows.As the increase of crack length,the critical slip surface would change and the slope safety factor would also reduce significantly.When the crack distribution was dense,the interaction between the cracks would affect the formation of the critical slip surface,but when the interval or row spacing increased,the influence would become less and less obvious.The slope safety factor varied with the change of the cracks dip angle as an open parabola.When the cracks dip angle was close to the slope angle,the slope safety factor would reach the minimum value.When the cracks were crossed,the critical slip surface and the slope safety factor would also be affected to a certain extent,which indicated that the type of the cracks was also an important factor affecting the slope stability.