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为了研究双根无粘结预应力筋上施加的预拉力对加筋体力学性能的影响,采用缩尺模型试验研究,以钢砂作为填料,既满足了工程中无黏性填料的强度,又模拟了加筋体的应力状态。通过分级施加无粘结预应力筋的预拉力及模型上部的荷载,获得了加筋体的变形及挡板背部土压力的分布,并将试验结果与普通加筋体的测试结果进行了对比分析。研究表明:施加预拉力前加筋体的顶部沉降小于普通加筋体的顶部沉降;无粘结预应力筋上预拉力可以显著减小挡板的水平变形,且影响加筋体顶部的沉降,该影响与无粘结预应力筋的位置有关;堆载后挡板的水平变形和加筋体的竖向变形均变化不大;在施加预拉力过程中无粘结预应力筋之间基本无相互作用。
In order to study the influence of the pre-tension exerted on the double-root unbonded prestressing tendons on the mechanical properties of the stiffened body, a scale model test was conducted. Using grit as filler, it not only satisfied the strength of non-stick filler in the project, The stress state of stiffened body is simulated. By prestressing the unbonded prestressed tendons and the load on the upper part of the model, the deformation of the stiffened body and the distribution of earth pressure on the back of the baffle are obtained. The test results are compared with the test results of the ordinary stiffened body . The results show that the settlement of the top of the stiffened body before the prestressing is smaller than that of the ordinary stiffened body. The prestressing force of the unbonded prestressing tendon can significantly reduce the horizontal deformation of the stiffener and the settlement of the top of the stiffened body. The influence is related to the location of the unbonded prestressing tendons. The horizontal deformation of the rear fender and the vertical deformation of the stiffened body have little change, and there is no significant difference between the unbonded prestressed tendons during the pre-tensioning interaction.