CAJ | 학술논문

寒区河流在春季往往会由于水力因素的剧烈变化而引发冰盖溃决,国内俗称为“武开河”.这一现象会导致冰坝形成,进而形成凌洪灾害.基于弹塑性力学分析,得到了考虑塑性变形的开河极限应力计算公式,与仅考虑弹性变形的极限应力公式相比,前者计算结果约为后者的1.39倍.通过黄河河曲段实例应用分析表明,开河前夕,将冰盖视为弹塑性材料,比视为完全弹性材料能够更好地消除判别结果误差,可为武开河判别提供理论参考.
한구하류재춘계왕왕회유우수력인소적극렬변화이인발빙개궤결,국내속칭위“무개하”.저일현상회도치빙패형성,진이형성릉홍재해.기우탄소성역학분석,득도료고필소성변형적개하겁한응력계산공식,여부고필탄성변형적겁한응력공식상비,전자계산결과약위후자적1.39배.통과황하하곡단실례응용분석표명,개하전석,장빙개시위탄소성재료,비시위완전탄성재료능구경호지소제판별결과오차,가위무개하판별제공이론삼고.
Mechanical ice-cover breakups often happen when the hydrodynamic conditions change rapidly in cold region rivers during the spring season, which is commonly known as“Wu Kai He”in Chinese. The breakup of ice-cover would result in the formation of ice dam and even the flood disasters. Based on the elastic-plastic theory, the formula for calculating the limit stress has been established. Analytical re?sults show that the limit stress calculated by assuming ice-cover as the elastic-plastic body is approximate?ly 1.39 times than the computing result if taking ice-cover as an absolute elastic body. By using the obser?vation data of Hequ Section at the Yellow River,the results error was effectively eliminated when assuming ice-cover as the elastic-plastic body,which provides a mechanical criterion based on the theory evidence.