| 引用本文: | 肖旻,熊志豪,吴浪,等.高地下水位冻土区弧形底浅拱梯形渠道冻胀力学分析[J].灌溉排水学报,0,():-. |
| XIAO Min,XIONG Zhihao,WU Lang,et al.高地下水位冻土区弧形底浅拱梯形渠道冻胀力学分析[J].灌溉排水学报,0,():-. |
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| 摘要: |
| 【目的】为明确高地下水位冻土区弧形底浅拱梯形渠道冻胀破坏机理并提出简捷、实用的抗冻胀设计方法。【方法】考虑此类渠道拱高明显小于断面整体深度的特殊性,基于Winkler假设提出衬砌体法向冻胀力计算方法。论证高地下水位渠道衬砌体微小刚性上抬位移对曲线形弧段切向冻结力的影响机制并提出切向冻结力计算方法。基于此构建高地下水位冻土区弧形底梯形渠道冻胀力学模型。【结果】以某弧形底梯形渠道为原型,对比分析不同渠底中心地下水位d对衬砌板截面内力及所受冻胀力的影响。结果表明,d越小则截面内力及冻胀力分布的横向差异越明显；地下水越深埋,截面内力及冻胀力分布受地下水补给条件的影响越小,与事实相符。充足的水分补给时间、补给来源以及冻胀力横向的不均匀、不同步是此类渠道易遭受冻胀破坏的主要原因。【结论】该模型可较好地反映此类渠道的冻胀受力特性,计算结果合理、可靠。可为高地下水位冻土区弧形底浅拱梯形渠道抗冻设计和相关研究提供参考。 |
| 关键词: 冻土工程;灌溉渠道;力学模型;弧底梯形;高地下水位 |
| DOI： |
| 分类号:S277；TV67 |
| 基金项目:国家重点研发计划重点专项(2017YFC0405100)；国家自然科学基金项目(U2003108，51641903，51869029)；江西科技师范大学博士科研启动基金项目(2019BSQD11) |
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| Mechanical Analysis of Frost Heave Damage for Trapezoidal Canalwith Shallow Arc-bottom in Cold Regions with High Groundwater Level |
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XIAO Min1, XIONG Zhihao1, WU Lang1, CUI Hao1, YANG Xiaosong2, GE Jianrui3
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1.School of Civil Engineering,Jiangxi Science Technology Normal University;2.College of Water Conservancy and Construction Engineering,Tarim University;3.College of Energy and Power Engineering,Lanzhou University of Technology
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| Abstract: |
| 【Objective】The objective is to reveal frost heave damage mechanism of trapezoidal canal with shallow arc-bottom in cold regions with high groundwater level and to put forward a simple and practical design method for frost heave resistance.【Method】Based on the Winkler assumption and the particularity that the arc-bottom highness is obviously smaller than overall depth of canal section, a calculated method of distribution of normal frost heave force was presented. Considering the influence on distribution of tangential freezing force on curved segment of canal lining by small rigid upward displacement of concrete lining, a calculated method of distribution of tangential freezing force was proposed. Finally, it’s completed to build the mechanical model of frost heave damage of trapezoidal canal with shallow arc-bottom in cold regions with high groundwater level.【Result】Taking a trapezoidal canal with shallow arc-bottom as prototype, comparative analysis for effect on distribution of section internal force and frost heave force by different underground water level d to the center of arc-bottom was carried out. Results show that transverse difference of distribution of section internal force and frost heave force increasingly evident as d is smaller. The effect on distribution of section internal force and frost heave force is smaller as the groundwater table is deeper. They all square with the facts. Adequate time and source for water recharge and transversely uneven distribution of frost heave force are the main cause of frost heave damage of such canals.【Conclusion】The presented model can reflect mechanical characteristic of such canals under the condition of frost heave well, and calculations are reasonable and reliable. The study can provide references for designs of frost heave resistance of such canals. |
| Key words: Frost;soil engineering, Irrigation;canals, Mechanical;model, Trapezoidal;canal with;shallow arc-bottom, High;groundwater level |
