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在桩承式加筋路堤设计计算及工程实践中,筋材的受力计算是具有争议且亟待解决的问题,然而,现有的研究很少关注桩承式加筋路堤中筋材应变的空间分布形式和三维模式下筋材的受力特征。采用自行研制的设备,以桩间距为变量,针对桩承式加筋路堤中筋材张力膜效应进行了物理模拟试验。试验中通过气压施加荷载,对筋材竖向变形和不同位置筋材应变进行观测。结果表明,张力膜效应下筋材应变和受力很不均匀。正方形布桩情形下,加筋材料的空间变形形态可采用空间抛物面与抛物柱面的组合来模拟。正方形布桩情形下假定筋材上所有荷载全部由相邻桩之间的4条筋带承担,得到的筋材受力计算值明显偏大。在模拟试验结果基础上,初步提出了考虑筋材三维空间变形的拉力计算方法。
In the calculation and engineering practice of pile-supported reinforced embankments, the stress calculation of the tendons is a controversial and urgent problem to be solved. However, the existing researches pay little attention to the spatial distribution of the strain of the tendons in the pile-supported reinforced embankment Force characteristics of bars in three-dimensional and three-dimensional mode. Using the self-developed equipment, taking the pile spacing as a variable, physical simulation tests were conducted on the tension membrane effect of the material in the reinforced embankment. In the experiment, the load was applied by air pressure to observe the vertical deformation of tendons and the strain of tendons in different positions. The results show that the strain and stress of tendons under tension membrane are very uneven. In the case of square piles, the spatial deformation of stiffened material can be simulated by the combination of space paraboloid and parabolic cylinder. In the case of square piles, all the loads on the tendons are assumed to be borne by four tendons between adjacent piles, and the calculated stress of tendons is obviously larger. Based on the simulation results, the calculation method of tensile force considering the three-dimensional deformation of tendons is proposed.