预应力加筋技术调整路堤差异沉降模型试验研究

Experimental study of modeling prestressed reinforced embankment to reduce differential settlement

基于前期预应力对加筋结构抗变形能力的显著提升作用,将预应力加筋技术应用到控制路堤差异沉降中。通过未加筋、加筋及预应力加筋不同形式的路堤模型试验,对比研究筋材及预应力对路堤差异沉降的影响规律。通过推导预应力-筋材-填土三相复合竖向模量,计算不同工况下路堤的差异沉降。研究结果表明:采用包裹加筋并施加预应力能较大程度提高普通路堤竖向复合模量,增加路堤刚度和整体性,路堤的承载力提高1~3倍,路堤差异沉降减少76%~88%。

Based on the model test result of the obvious effect of prestress on deformation resistance of the reinforced cantilever structure, the prestressed reinforcement technology was applicable to control the differential settlement of the embankment. Comparing the model tests of the embankment without and with reinforcement,and prestressed reinforcement, the influence law of the reinforcement and prestress on the differential settlement of the embankment was studied. The differential settlement of embankment under various working conditions was calculated by the derived prestressed-reinforced-filled three-phase composite vertical modulus. The results show that the application of reinforcement and prestressing can make the vertical composite modulus largely increase the stiffness and integrity of the embankment, the bearing capacity of the embankment is improved by 1-3 times,and also the differential settlement of the embankment reduces by 76%-88%.