预应力锚索加固边坡的数值模拟分析

摘要

Combined with practical projects, and with the FEM software ANSYS, the whole bond tensioned grout anchor, the not whole bond tensioned grout anchor and pressured grout anchor reinforcing slope are analyzed by numerical calculation. Based on strength reduction method principle, the stabil-ity factor before and after slope reinforcement is calculated and the stability of pre-stressed anchor reinforced slope is evaluated. The results show that the maximum deformation, maximum vertical displacement, maximum plasticity equivalent strain and maximum equivalent stress are tiny and the plasticity zone is small after pre-stressed anchor reinforced slope. The stability factor calculated by numerical calculation meets the demand and achieves the aim of reinforcement. The maximum equivalent stress of pressured grout anchor is less than that of tensioned grout anchor and there is stress concentration with tensioned grout anchor at slide area, so the pressured grout anchor reinforcing slope is superior to that of tensioned grout anchor.%结合工程实例，采用有限元软件ANSYS，对全粘结拉力型、自由段非粘结拉力型和压力型预应力锚索加固边坡进行数值计算，并基于强度折减法原理，计算了边坡加固前后的稳定安全系数，对预应力锚索加固边坡的稳定性进行评价。结果表明，预应力锚索加固边坡后，边坡的最大变形、最大竖向位移、最大塑性等效应变和最大等效应力均较小，边坡塑性区很小，并且有限元计算得到的稳定安全系数满足要求，达到了加固边坡的效果；压力型预应力锚索最大等效应力小于拉力型预应力锚索，且全粘结拉力型预应力锚索在滑带处产生应力集中，因此压力型预应力锚索具有一定的优越性。