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CRTSⅡ型板式轨道采用摩擦板+主端刺形式的台后锚固结构。本文分析该锚固结构作用机理,指出摩擦板与底座板间摩擦力和土体阻力是保持锚固结构稳定的主要因素,提出锚固结构的两种失稳形式。在此基础上,提出台后锚固结构抗力计算方法,给出土体一般状态、极限抗剪状态和黏聚力丧失状态下土体阻力计算公式。应用提出的计算方法,分析倒T型主端刺锚固结构稳定性,指出底座板弹性模量折减存在的问题。开展现场试验,验证常用倒T型主端刺锚固结构在设计荷载下的安全稳定性,同时指出设计优化方向及填料存在的问题。
CRTS Ⅱ type plate track friction plate + main type of post-piercing anchor structure. In this paper, the mechanism of the anchoring structure is analyzed. It is pointed out that the friction between the friction plate and the base plate and the resistance of the soil are the main factors to maintain the stability of the anchoring structure, and two kinds of instability modes of the anchoring structure are proposed. On this basis, the calculation method of the resistance of the anchoring structure of the backstage is proposed, and the calculation formula of the soil resistance under the condition of the general soil state, the ultimate shear state and the loss of cohesion is given. The proposed method is applied to analyze the stability of the inverted T-type anchor bar anchor structure and the problems of the reduction of the elastic modulus of the base plate. Field tests were carried out to verify the safety and stability of the commonly used inverted T-type anchor bar anchored structures under design loads. At the same time, the design optimization direction and the problems of packing were pointed out.