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利用动力离心模型试验研究地震条件下抗滑桩加固边坡的稳定性机理及破坏规律时,应使抗滑桩模型力学特性尽量满足模型试验相似比尺关系。通过试验找出了一种合适的微混凝土配合比,基于模型相似比尺理论研制出了4种不同桩径的微混凝土抗滑模型桩,并通过三点抗弯试验测定了相应的抗弯强度,根据相似比尺关系换算出了所能模拟的50倍原型桩的抗弯承载能力。然后,进行了两个动力离心模型试验。试验表明,研制的微混凝土桩抗弯承载力可以在离心机加速度为50 g条件下再现抗滑桩的静力破坏或动力稳定等一系列动力响应特征,说明原型材料模型桩能够有效地用于揭示弹性动力响应以及破坏现象。
When using dynamic centrifugal model test to study the stability mechanism and failure rule of anti-slide piles reinforced slope under seismic conditions, the mechanical characteristics of the anti-slide piles model should be satisfied as much as possible to simulate the relationship between the model tests. Through the experiment, a kind of suitable micro-concrete mix ratio was found out. Based on the model similarity scale theory, four kinds of micro-concrete anti-sliding model piles with different pile diameters were developed, and the corresponding flexural strength According to the similar scale relationship, the bending load carrying capacity of the 50 times prototype pile can be calculated. Then, two dynamic centrifugal model tests were performed. Experimental results show that the flexural capacity of the micro-concrete piles developed can reproduce a series of dynamic response characteristics of the anti-slide piles under the conditions of an acceleration of 50 g, indicating that the prototype material model piles can be effectively used in Reveal elastic dynamic response and destruction phenomenon.