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| 大庆红旗泡水库淡水冰弯曲强度试验研究 | |
| 引用本文： | 张傲妲,冀鸿兰,李志军,张宝森,徐晶. 大庆红旗泡水库淡水冰弯曲强度试验研究[J]. 中国农村水利水电, 2011, 0(3) |
| 作者姓名： | 张傲妲 冀鸿兰 李志军 张宝森 徐晶 |
| 作者单位： | 1. 内蒙古农业大学水利与土木建筑工程学院,内蒙古,呼和浩特,010018 2. 大连理工大学海岸和近海工程国家重点实验室,辽宁,大连,116024 3. 黄河水利委员会黄河水利科学研究院,河南,郑州,450003 |
| 基金项目： | 国家自然科学基金资助项目(50879008) |
| 摘 要： | 采用三点弯曲法对大庆红旗泡水库淡水冰试样进行弯曲试验.冰梁发生破坏时,主要经历三个阶段:第一阶段是在杂质和气泡边缘首先产生微裂缝;随着荷载的增加,出现新的微裂缝,并且受拉区达到抗拉强度,此为第二阶段;此后荷载继续增加,冰中微裂缝扩展延伸为宏观裂缝,当施加的荷载大于冰梁的杭拉强度时,冰梁即被破坏,这是第三阶段.在分析上述淡水冰破坏机理的基础上,对试验结果进行研究.结果表明,水库淡水冰弯曲强度与应力速率和冰温有着密切关系.在小于2 kPa/s的应力速率范围内,随着应力速率的增大,弯曲强度减小.冰温在-5℃～15℃范围内,对应的应力速率在30～70 kPa/s范围内时,冰梁弯曲强度达到极限,同时也揭示了极限弯曲强度对应的应力速率随着温度的降低逐渐向低应力速率转化.达到极限弯曲强度后,应力速率继续增加,弯曲强度值呈减小趋势.弯曲强度随着冰温的降低呈增加趋势,且弯曲强度在-15℃时达到最大值2 270 kPa. |
| 关 键 词： | 水库 淡水冰 弯曲强度 应力速率 温度 |
Experimental Research on Flexural Strength of Fresh Water Ice in Hongqipao Reservoir in Da-qing |
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| ZHANG Ao-da , JI Hong-lan , LI Zhi-jun , ZHANG Bao-sen , XU Jing. Experimental Research on Flexural Strength of Fresh Water Ice in Hongqipao Reservoir in Da-qing[J]. China Rural Water and Hydropower, 2011, 0(3) | |
| Authors: | ZHANG Ao-da JI Hong-lan LI Zhi-jun ZHANG Bao-sen XU Jing |
| Affiliation: | ZHANG Ao-da1,JI Hong-lan1,LI Zhi-jun2,ZHANG Bao-sen3,XU Jing1(1.College of Water Conservancy and Civil Engineering,Inner Mongolia Agricultural University,Hohhot 010018,China,2.State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,Liaoning Province,3.Yellow River Hydraulic Research Institute,Yellow River Commission,Zhengzhou 450003,China) |
| Abstract: | Experiments of natural freshwater ice samples are made on Hongqipao Reservoir in Daqing by three-point bending method.Ice girder mainly experiences three stages when faced with breakage.The first stage is that tiny cracks are produced at the edge of impurities and air bubbles.New tiny cracks are also produced with the increase in the load,and the enduring pull area reaches tensile strength,called the second stage.With the increase in the load,the tiny cracks of inner ice extend and form macro-scopical crack... |
| Keywords: | reservoir freshwater ice flexural strength stress rate temperature |
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