为提高有限单元法在土石坝施工填筑数值仿真中的施工填筑模拟效率并修正数值仿真填筑位移,针对目前采用的“生死单元法”和“空气单元法”计算效率低的问题,提出了一种处理单元的施工填筑模拟方法,即给每个单元赋予施工信息进行施工次序控制,未施工单元不参与仿真计算。工程实例表明,该方法与传统方法相比可节省50%计算时间。由于有限元仿真时自重荷载是一次性施加的,这与实际施工时逐级加载的变形机理是不同的,需要对有限元计算位移进行修正,因此,基于土体一维线弹性压缩沉降理论,推导了单填筑级及多填筑级下的位移修正公式,完善了施工填筑位移修正方法。
Abstract
The finite element methods of “activation and deactivation elements” and “air elements” commonly used in the numerical simulation and the displacement modification for earth-rock dam construction have low efficiency. To improve the efficiency of construction simulation and the modification of construction displacement, a method of dealing with the construction elements is proposed, which is that every element is given a construction information to control the construction sequence, and the non-construction elements are not taken in the simulation computation. By using this method, half of the time can be saved compared with the conventional methods. Because the settlement mechanism of a single gravity loading in FEM simulation is different from that of step loading in practical construction, the computed displacement field in the new filling soil should be modified. On the basis of one-dimensional elasticity settlement theory for soil, the displacement modification formulas for single construction layer and multi-layers are given. This research improves the displacement modification method for construction simulation of earth-rock dam.
关键词
土石坝 /
施工填筑仿真 /
有限单元法 /
位移修正
Key words
earth-rock dam /
construction simulation /
finite element method /
displacement modification
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基金
国家自然科学基金资助项目(51179097);长江科学院开放研究基金资助项目(CKWV2013208/KY);湖北省教育厅科学技术研究项目(Q20131306);三峡大学人才科研启动基金项目(KJ2012B008)
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