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采用FLAC~(3D)强度折减法,研究在岩层倾角、岩层与边坡走向夹角变化时三维软硬互层边坡的稳定性状况,并对其破坏模式进行辨识与归纳分析.结果表明:边坡破坏模式的判别应综合考虑岩层的倾角大小、岩层走向与边坡走向的夹角大小及坡面上的剪出条件;当岩层与边坡走向夹角β<90°时,随着岩层倾角α的增大,边坡的破坏模式变化趋势为由蠕滑-压致拉裂、塑流-拉裂、滑移-拉裂向滑移-弯曲、弯曲-拉裂转变;当β>90°时,边坡的破坏模式趋势为塑流-拉裂、滑移-弯曲、弯曲-拉裂;边坡稳定性系数随走向夹角的增大先增加后减小,β=90°时最大,且α越大,稳定性系数峰值越大;顺向时随着岩层倾角的增大,边坡的破坏模式变化趋势为蠕滑-压致拉裂、滑移-拉裂、滑移-弯曲、弯曲-拉裂,稳定性系数变化先减小后增大,存在一最不利岩层倾角,其对应的稳定性系数最小;反向坡的破坏模式变化趋势为蠕滑-压致拉裂和弯曲-拉裂,稳定性系数逐渐增加.
The FLAC ~ (3D) strength reduction method was used to study the stability of the three-dimensional soft-hard interbedded slope when the angle of formation changed and the angle between rock formation and slope changed, and the failure modes were identified and analyzed.The results showed that: The judgment of slope failure mode should consider the angle of rock formation, the angle between the strike of rock and the direction of slope and the condition of cutting out on the slope. When the angle between rock formation and slope strike is less than or equal to 90 °, The change tendency of the failure mode of the slope changes from creep-piezoresistive cracking, plastic flow-pull-out, slip-pull-to-slip to bend-bend- °, the tendency of the failure mode of the slope is plastic flow-pull-break, slip-bend, bend-pull-crack. The slope stability coefficient increases first and then decreases with the increase of the included angle, , And the bigger the α is, the bigger the peak value of stability coefficient is. In the normal direction, with the dip of rock strata increasing, the trend of failure mode of the slope is creep-piezoclasting, slip-delamination, slip-bending , Bending-cracking, the change of stability coefficient firstly decreases and then increases, and there is a dip angle of the most unfavorable strata, and the corresponding stability coefficient is the least; Change of the failure mode to creep - pressure-induced bending and breakage - rip, stability factor increases gradually.