桩承式加筋路堤张力膜效应模型试验研究

发布时间：2018-05-06 06:48

本文选题：桩承式加筋路堤 + 加筋材料　；参考：《岩土力学》2016年07期

【摘要】：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。
[Abstract]:In the design and calculation of pile-supported reinforced embankment and engineering practice, the stress calculation of reinforced material is a controversial and urgent problem to be solved. Little attention has been paid to the spatial distribution of the reinforcement strain in the pile-supported reinforced embankment and the stress characteristics of the reinforced material in the three-dimensional model. A physical simulation test was carried out on the tension film effect of reinforced concrete in pile supported reinforced embankment with the self-developed equipment and the pile spacing as variable. The vertical deformation of steel bar and the strain of steel bar in different position were observed by applying pressure load in the experiment. The results show that the strain and force of the tendons are very uneven under the effect of tension film. In the case of square piles, the spatial deformation of reinforced materials can be simulated by the combination of parabola and parabolic cylinder. In the case of square piles, it is assumed that all the loads on the steel bar are carried by the four reinforcement bands between adjacent piles, and the calculated value of the stress of the steel bar is obviously larger than that of the steel bar. Based on the results of the simulation tests, a method for calculating the tensile force considering the three-dimensional spatial deformation of the steel bar is proposed.
【作者单位】：同济大学地下建筑与工程系;同济大学岩土工程与地下结构教育部重点实验室;
【基金】：国家自然科学基金资助项目(No.41272293) 云南省交通运输厅科技计划项目(云交科2015(A)12)~~
【分类号】：U416.12

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