基于简化模型的预应力锚杆复合土钉支护体系能量方程的建立

摘要

According to prestressed anchor composite soil nails support system,the paper discussed the limitations of limit equilibrium method and f inite element method,and proposed a new idea of applying energy equation to evalu-ate the system stability.Firstly, the composite support system was simplif ied as single prestressed anchor f lexible retaining structure which acts on special reinforced soil based on reasonable assumptions and a simplif ied mechanics model was established.Then, reinforcement mechanism of soil nails support was analyzed and the concept of homogeneous cohesion was put forward according to the principle of virtual work.Finally,the energy equations of reinforced soil and prestressed anchor were derived.The proposed method in this paper will provide a reference for improving the stability analysis of prestressed anchor composite soil nails support system.%针对预应力锚杆复合土钉支护体系，讨论了极限平衡法及有限元法的局限性，提出运用能量方程评价体系稳定性的新思路。首先，基于合理假定将复合支护体系简化为作用于增强体的单一的预应力锚杆柔性支护，并建立简化力学模型；然后，根据虚功原理对土钉支护的加固机理进行分析，提出类黏聚力的概念；最后，推导出增强土体及预应力锚杆的能量方程。提出的方法对于推进预应力锚杆复合土钉支护体系的稳定性分析有着一定的借鉴意义。