考虑温度变化和长期变形的面板堆石坝模拟

面板裂缝是影响混凝土面板堆石坝安全和性能的关键因素之一。本文基于ABAQUS软件，开展了堆石体长期变形与混凝土水化热、时空不均匀分布温度场边界施加等二次开发，以老挝某混凝土面板堆石坝为研究对象，研究了堆石体长期变形、混凝土水化热、环境温度变化的联合作用机制。分析了堆石体长期变形量值、面板浇筑时间过程、环境温度数值和分布模式等对面板应力变形的影响，揭示了混凝土浇筑后早期水化热温升和环境温度影响导致面板表面较大顺坡向拉应力是面板大量早期水平裂缝的主要原因；同时也发现，即使对于浇筑后较长时间，考虑温度变化情况下计算出的面板拉应力也高于不考虑温度变化情况。计算分析可为面板浇筑时机选择，面板温度裂缝、变形裂缝分类防控等提供技术依据。

Simulation of faced rockfill dams considering temperature change and long-term deformation

Cracking of face slabs of a concrete faced rockfill dam is one of the key factors affecting its safety and performance. Based on the ABAQUS software, this study carries out secondary development to simulate the long-term deformation of rockfill material and the hydration heat of concrete, imposing a boundary of temperature varying in space and time. We examine the joint action mechanism of continuously increasing in the long-term deformation of rockfill body and spatiotemporal variations in environmental temperature, combining with a case study of a concrete faced rockfill dam in Laos. The main cause of a large number of early horizontal cracks on the panel is revealed－excessive along-slope tensile stress in the panel surface layer that is caused by temperature rising due to concrete hydration heat and by ambient temperature changes in early time after concrete casting. Results show that the tensile stress calculated in the condition of temperature change is higher than that under constant temperature. Thus, this study suggests an important perspective for selecting slab concrete casting timing and controlling temperature cracks or deformation cracks.