| 摘要: |
| 【目的】基于混凝土面板与垫层之间接触面的数值计算模型，考虑温度荷载作用，研究面板堆石坝面板的应力变形特性。【方法】以接触摩擦单元理论为基础，采用接触单元模拟混凝土面板与垫层之间的接触面，进行了公伯峡混凝土面板堆石坝面板应力变形仿真计算，并将计算结果与观测数据进行对比分析。【结果】面板挠度呈现出中部大、两端小的分布规律，最大值为0.24 m，位于面板的中心位置，与观测结果基本一致；面板的顺坡向应力分布呈现出中部受压、两端受拉的变化趋势，顺坡向压应力最大值为7.9 MPa，出现在约1/2坝高处，拉应力最大值为1.3 MPa，出现在面板的底部与顶部；面板底面点与表面点的应力分布是一致的，在同一高程处，面板底面点的应力较表面点大；考虑温度荷载作用时，混凝土面板的顺坡向应力分布规律与不考虑温度荷载时基本一致，但拉应力值明显增大，并且与实际观测结果更为接近。【结论】基于接触摩擦计算模型，考虑温度荷载作用，可以获得更为准确的混凝土面板应力变形数值计算结果。 |
| 关键词: 混凝土面板 堆石坝 温度荷载 接触摩擦 应力变形 |
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| 基金项目:国家自然科学基金项目(51309190)；教育部博士点基金项目（20126118120015）；中国博士后科学基金（2014M552470）；西安市科技计划项目（CXY1349(7)） |
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| Stress and deformation properties of concrete face |
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LI Yan-long,TU Xing,WANG Hai-sheng,et al
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| Abstract: |
| 【Objective】Based on a numerical calculation model for interface between concrete face and cushion layer,this paper studied the stress and deformation properties of concrete faced rock fill dam with the consideration of temperature load.【Method】Based on the theory of contact-friction element,calculation of the stress and deformation of Gongboxia concrete faced rock fill dam was conducted using contact elements to simulate the contact surface between concrete slab and cushion layer.The calculation results were compared with observed data as well.【Result】Concrete face deflection was large in central area and was small on both sides.The maximum value of deflection was 0.24 m,located in the center of the concrete face,and was consistent with the measured data.The stress distribution along the slope showed a distribution of central compression and tension at both ends.The maximum value of the compressive stress along the slope was 7.9 MPa,appeared at about 1/2 dam height,and the maximum value of the tensile stress was 1.3 MPa,appeared in both bottom and top of the concrete face.The stress distribution of the concrete face underside and the surface was consistent,and the concrete face underside had greater stress than the surface at same elevation.Considering the temperature load, the stress distribution along the slope was consistent with the law without consideration of temperature load.However,considering temperature load had larger tensile stress value and was closer to the measured data.【Conclusion】Based on contact friction calculation model,accurate information of the distribution of the stress and deformation of the concrete face with the consideration of temperature load was obtained. |
| Key words: concrete face rock fill dam temperature load contact friction stress and deformation |
