| 摘要: |
| 【目的】针对目前水工压力隧洞配筋设计中公式法、边值法和一般有限元法计算结果差异较大，使工程设计人员难以决断的问题，建立更符合压力隧洞实际工作性态的配筋计算方法。【方法】在剖析现有计算方法基本假定的基础上，建立了一套数值模拟方法，即采用katona裂缝单元模拟衬砌中的裂缝，通过特殊的钢筋及跨缝筋单元模拟钢筋与混凝土相互作用及跨缝处作用机制，推求较为真实的衬砌应力、钢筋应力及裂缝宽度，然后根据设计条件确定配筋方案。【结果】采用建立的数值分析方法，对金沙江鲁地拉水电站压力引水隧洞进行对比计算分析，结果显示，当内水压力水头为1.3 MPa（130 m）、围岩为Ⅳ类时，采用建议方法得到的配筋方案为5Φ25(4 900 mm2)，介于边值法20Φ30(28 260 mm2)和公式法3Φ16(1 200 mm2)之间。【结论】利用所建立的计算方法得到的配筋结果与实际较为吻合，能够帮助设计人员合理确定水工压力隧洞配筋方案。 |
| 关键词: 压力隧洞 衬砌 配筋计算 裂缝 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金项目(50879068);国家自然科学基金创新群体项目(40821001) |
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| Reinforcement calculation of hydraulic pressure tunnel lining |
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HE Min,HU Ying,LI Ning,et al
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| Abstract: |
| 【Objective】Aiming at of the differences in reinforcement calculation methods such as the formula method,the boundary value method and the general finite element method,a reasonable method was established in this study to guide practical work.【Method】Based on the analysis of basic assumptions of existing methods,a numerical simulation method was established to simulate the cracks in the lining by Katona crack element as well as the interaction between rebar and concrete by the element of rebar across crack.Then,more realistic lining stress,rebar stress and crack width were obtained for better reinforcement scheme according to design conditions.【Result】Based on the established numerical method,the reinforcement design of diversion pressure tunnel of Ludila hydropower station was implemented.When the water pressure was 1.3 MPa (130 m) and the classification of surrounding rock was Ⅳ,the proposed method was reinforcement 5Φ25 (4 900 mm2),between the boundary value method 20Φ30 (28 260 mm2) and the formula method 3Φ16 (1 200 mm2).【Conclusion】The results of the established method were in good agreement with actual results,and can help designers to reasonably determine hydraulic pressure tunnel reinforcement. |
| Key words: pressure tunnel lining reinforcement calculation crack |
