| 李春江,李志军,杨宇,王庆凯,张宝森,邓宇.冰上石笼自然沉排的冰热力学和力学理论及应用[J].水利学报,2022,53(4):445-455 |
| 冰上石笼自然沉排的冰热力学和力学理论及应用 |
| Theory and application of ice thermodynamics and mechanics for sinking naturally gabions mattress on ice |
| 投稿时间：2021-09-24 |
| DOI：10.13243/j.cnki.slxb.20210871 |
| 中文关键词: 黄河冰 冰热力学 冰力学 承载力 石笼自然沉排 |
| 英文关键词: Yellow River ice ice thermodynamics ice mechanics bearing capacity sinking naturally gabions mattress |
| 基金项目:国家自然科学基金项目（51979024，51879116）；国家重点研发计划项目（2018YFC1508402-2） |
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| 中文摘要: |
| 为了有效实施冰上石笼的自然沉排，2020—2021年冬季在黄河什四份子弯道开展了现场试验。综合该冬季气象资料、石笼沉排周边冰面变形观测资料、实测冰厚资料以及以往冰力学成果，得到黄河什四份子石笼自然沉排试验期间的冰-水界面热通量9.06 W/m2和冰层长期载荷下承载力衰减系数0.08，构建包含冰厚、冰温和衰减时间的冰层承载力表达式。在此基础上，按照黄河冰上石笼自然沉排施工时间120 h计算，给出黄河宁蒙段无缺陷冰层和有缺陷冰层实施冰上石笼自然沉排的冰厚、气温组合安全分界条件，并建议含有气泡、泥沙和细小裂缝的小缺陷冰层，施工安全冰厚增加10%；当冰内裂缝深度超过冰厚50%或裂缝内有水流的大缺陷冰层，施工安全冰厚增加40%。 |
| 英文摘要: |
| In order to effectively implement the natural sinking of gabions mattress on ice, field experiments of gabions mattress were carried out in the winter of 2020-2021 at Shisifenzi bend of the Yellow River. Some data were collected,including winter meteorological data in winter,observation data of ice deformation around gabion mattress and measured ice thickness data. Based on the above data and previous results of ice bearing capacity,the heat flux at the ice-water interface during the experiment in Shisifenzi of the Yellow River is 9.06W/m2 and the attenuation coefficient of bearing capacity under long-term load of ice layer is 0.08. The ice bearing capacity expression including ice thickness, ice temperature and decay time is constructed. Using the above expression,the construction safety boundary conditions under the combined conditions of air temperature and ice thickness are calculated,which results are the premise that the gabions mattress construction can be completed within 120h. It is suggested that the construction safety ice thickness should be increased by 10% with a small defect of ice containing air bubbles,sediment and tiny cracks. If the ice crack depth exceeds 50% of the ice thickness or the crack has water flow,the construction safety ice thickness increases by 40%. |
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