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为了深入研究中巴喀喇昆仑公路洪扎河以北地段的顺层岩质边坡弯曲失稳机制,采用材料力学压杆稳定及刚性体平衡原理,在D.S.Cavers的基础上考虑地震力作用,分析得到岩质边坡的三种弯曲模型(平面边坡的柔性弯曲、平面边坡的三铰梁模型、曲线边坡的三绞铰模型)的失稳公式,将地震与非地震作用下平面边坡的柔性弯曲进行对比分析。研究结果表明:当内摩擦角φj处于0°~15°范围时,若水平地震加速度方向与岩体弯曲方向相反,平面边坡柔性弯曲模型在地震作用下不易发生弯曲变形;若水平地震加速度方向与岩体弯曲方向一致,地震作用下平面边坡柔性弯曲模型的临界状态总长度l总比非地震作用下的l小,平面边坡在此方向的地震作用下更易发生柔性弯曲变形。
In order to further study the buckling and instability mechanism of the bedding rock slope along the northern section of Hongza River in the Kara-Khonlu Highway in China, the principle of material mechanics and stability of strut and the principle of rigid body balance are adopted. Based on the DSCavers, Three kinds of bending models of rock slope (flexible bending of plane slope, three-hinge beam model of plane slope and three-hinge model of curve slope) are obtained by analyzing the instability formula of rock slope, Slope flexible bending comparative analysis. The results show that when the internal friction angle φj is in the range of 0 ° ~ 15 °, if the horizontal seismic acceleration direction is opposite to that of the rock mass, the flexible bending model of the plane slope is not prone to bending deformation under the action of the earthquake. If the horizontal seismic acceleration direction The same with the bending direction of rock mass, the total critical state length L of flexible bending model of plane slope under earthquake is always smaller than that under non-seismic action. The plane slope is more prone to flexible bending deformation under the earthquake action in this direction.