| 摘要: |
| 【目的】 探讨弧形坡脚梯形渠道衬砌结构冻胀破坏的力学模型，以科学指导衬砌体的设计与建设。【方法】 通过对弧形坡脚梯形渠道砼衬砌冻胀破坏机理及破坏特征的分析，指出了弧形坡脚梯形渠道砼衬砌整体结构的计算简图，是在法向冻胀力、切向冻结力和重力共同作用下的近似薄壳拱形结构，基于此建立了该砼衬砌整体结构冻胀破坏的力学模型。【结果】 求出了冻胀控制内力及最大拉应力的计算公式，并结合砼板抗裂条件，给出了胀裂部位、衬砌板厚及抗冻胀破坏验算的一系列计算方法。【结论】 弧形坡脚梯形渠道砼衬砌结构较梯形渠道法向冻胀力数值小、分布均匀、恢复力大，整体适应变形及抗冻胀能力强，从而优于梯形断面，为弧形坡脚梯形渠道防冻胀设计提供了科学依据。 |
| 关键词: 弧形坡脚梯形 渠道砼衬砌 冻胀破坏 力学模型 |
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| 基金项目:国家“863”计划项目（2002AA62Z3191）；国家冻土工程重点实验室基金项目（9901） |
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| Research of the frost heaving destruction mechanics model of the concrete lining channel in trapezoidal section with curved slop toe |
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YU Guo qiang1 LI Zhan bin1 2 ZHANG Xia3 LI Peng1 DU Zhong1
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| Abstract: |
| 【Objective】 The study discussed the frost heaving destruction mechanic model of the concrete lining channel in trapezoidal section with curved slop toe to guide the design and structure of the lining scientifically.【Method】 Through analyzing the frost heaving destroy rule and character of the concrete lining channel in trapezoidal section with curved slop toe,the calculation sketch is approximate a thin shell arch structure produced by the normal frost heaving pressure,the tangential frost heaving pressure and gravity together and based on this,the frost heaving mechanics model of this structure is given.【Result】 The calculation formula of the frost heaving control internal force and the maximum draw stress is worked out.Combined with the anti crack term of the concrete board,a series of calculation methods for the crack part,lining board thickness and anti frost heaving destruction checking are obtained.【Conclusion】 Theoretical analysis shows that,compared with the trapezoidal section,the normal frost heaving pressure of the concrete lining channel in trapezoidal section with curved slop toe is smaller,more equally distributed with good resilience and stronger ability in adapting distortion wholly and anti frost heaving.It provides science gist to the anti frost heaving design of the concrete lining channel in trapezoidal section with curved slop toe. |
| Key words: trapezoidal section with curved slop toe concrete lining channel frost heaving destruction mechanic model |
