缝水压力和裂缝面接触条件对重力坝裂缝扩展影响

发布时间：2019-04-16 09:58

【摘要】：基于多边形比例边界有限元模拟了重力坝裂缝扩展过程,综合考虑了坝-库水-地基相互作用、裂缝面接触和缝水压力的影响。其中该接触模型能够有效防止裂缝面的相互嵌入;该缝水模型除能考虑裂缝面开合速度、缝隙宽度和水流形态对缝水压力分布的影响,还可基于连续性条件模拟缝内水体流动和空化的现象。以Koyna坝裂缝扩展为例,研究了裂缝面接触条件和缝水压力对计算结果的影响。结果显示,考虑接触的影响,震损较为严重。而与假定为常水压力分布的情况相比,实际的缝水压力分布形式对结果影响较为复杂。在裂缝张开时,减小了裂缝扩展的可能,而在裂缝闭合时正好与之相反。
[Abstract]:The crack propagation process of gravity dam is simulated based on polygonal proportional boundary finite element method, and the effects of dam-reservoir-foundation interaction, crack surface contact and fracture water pressure are considered comprehensively. The contact model can effectively prevent the fracture surface from embedding into each other. The model can not only consider the effects of crack surface opening and closing velocity, gap width and flow pattern on the distribution of water pressure, but also simulate the phenomenon of water flow and cavitation in the seam based on continuous conditions. Taking the crack propagation of Koyna dam as an example, the effects of fracture surface contact conditions and fracture water pressure on the calculated results are studied. The results show that the earthquake damage is serious considering the influence of contact. Compared with the case where the normal water pressure distribution is assumed, the influence of the actual fracture water pressure distribution on the results is more complicated than that of the normal water pressure distribution. When the crack is opened, the possibility of crack propagation is reduced, but when the crack is closed, it is just the opposite.
【作者单位】：大连理工大学海岸与近海工程国家重点实验室;大连理工大学建设工程学部水利工程学院工程抗震研究所;
【基金】：国家重点研发计划(项目编号2016YFB0201000;课题编号2016YFB0201001) 国家自然科学基金委创新研究群体基金(51421064)资助项目
【分类号】：TV642.3

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