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针对顺层岩质路堑边坡稳定的关键影响因素,采用有限元强度折减法,研究了边坡高度、坡顶堆载及工程防护对具一组贯通软弱结构面的顺层岩质边坡模型稳定性的影响,并与传统极限平衡法进行了对比验证。研究结果表明:边坡坡度大于岩层倾角时对稳定不利,安全系数随边坡高度增加而降低;坡顶堆载时,安全系数的降低取决于荷载和贯通塑性区的相对位置;挡土墙或锚杆通过对塑性区贯通带的阻截使塑性区转移到其他更薄弱的结构面,从而提高安全系数,塑性区贯通带的转移去向取决于初始支撑强度;基于Drucker-Prager屈服准则的安全系数有限元计算结果比基于莫尔-库仑准则的传统极限平衡法计算结果平均高出约22%,与郑颖人等约为25%的研究成果非常接近,说明有限元强度折减法可行。
Aiming at the key factors affecting the stability of bedding rock cut slopes, the bedding rock slope model with a set of through weak structural planes is studied by the finite element strength reduction method. Stability and contrast with the traditional limit equilibrium method. The results show that: when the slope slope is greater than the dip of the strata, it is not stable to the stability, and the safety factor decreases with the increase of the slope height; when the top of the slope is piled up, the safety factor declines depending on the relative position of the load and the through plastic zone; The anchorage increases the safety factor by stopping the plastic zone from penetrating through the plastic zone to other weaker structural planes. The transfer of the through zone in the plastic zone depends on the initial support strength; the safety factor based on the Drucker-Prager yield criterion is limited The calculated result of meta is about 22% higher than the traditional limit equilibrium method based on the Mohr-Coulomb criterion, which is close to the result of about 25% such as that of Zheng Yingren, which shows that the finite element strength reduction method is feasible.