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从作用机理上分析,土钉支护体系与锚杆支挡体系及加筋土结构有所不同:锚杆支挡体系为锚固机制;加筋土结构为加固机制;而土钉支护体系为加固基础上的锚固机制。从边坡锚固稳定的思路出发,将土钉与土体视为c,φ有所改变的增强体,预应力锚杆复合土钉支护体系简化为作用于特殊增强体的预应力锚杆柔性支护,结合增量法分析每步开挖及预应力施加产生的荷载增量并进行合理分配,较好地解决了开挖支护过程中土钉受力的发展变化规律。最后通过工程实例对所建模型的计算结果进行验证,表明增量法用于复合土钉支护体系的设计计算具有一定的合理性。
From the mechanism of action analysis, soil nailing support system and the anchor support system and reinforced earth structure is different: anchor support system is anchoring mechanism; reinforced soil structure is the reinforcement mechanism; and soil nailing support system is Reinforcement based on the anchoring mechanism. From the idea of slope stability and stability, the soil nails and soil as c, φ have been changed to enhance the body, prestressed anchor composite soil nailing system simplified to a special reinforced body prestressed anchor flexibility Support and combined with increment method to analyze the increment of load caused by each step of excavation and prestressing application and reasonably distribute it, so as to solve the development and change law of soil nailing force during excavation and support well. Finally, the calculation results of the model are validated through the engineering examples, which shows that the incremental method is reasonable for the design and calculation of composite soil nailing system.