In Situ Verification Study And Simulation Of The Blasting Of The Heilongjiang River Lce Jam

The Heilongjiang River,the main river in the province where the ice jam disaster occurred,is a significant economic and trading region for both China and Russia,with its main stream being a major source of commerce.An international border river between Russia and China,the Heilongjiang River is a typical example of a river in the frigid high latitude region.The characteristics of the special section of the river channel are prone to ice accumulation,congestion of the water level of the river channel,triggering ice flooding.Large-scale flooding can cause great harm to the residents of China and Russia along the river,and peaks caused by ice dams can cause great harm to the buildings and farmland along the river.Ice cover blasting is one of the common methods used in engineering or river prevention and crossing.It is demanded to choose ANSYS/LSDYNA dynamic mechanical simulation software for simulation blasting,simulating blasting from ignition method,explosive quantity,ignition position and ice distance respectively,achieving the best blasting effect by blasting ice thickness of 100 cm or more in the center of the ice cover ignition,explosive distance from ice layer below 150 cm blasting while choosing the simulated blasting method for the main stream of the Heilongjiang River for the ice blasting test.The results of this study show:(1)A range of water level impacts on the upstream and downstream areas after the ice cap blasting,and this range of impact is related to the length and width of the blasting.(2)After the blasting of the ice cap,the water and heat exchange conditions and flow rate distribution change,which will lead to obvious changes in the tensile and bending properties of the ice cap,making the area and the ice cap within 500 meters more vulnerable to damage.(3)after the ice sheet blasting,the explosion area of the heat and velocity boundary conditions have changed,as the temperature rise,blasting area ice becomes complex,the area of the border is easy to lead in ice,it is beneficial to the river,but if in the middle part of the river,there may be some favorable conditions into unfavorable conditions.(4)After the blasting of the ice sheet,the change of water and heat factors in the blasting area indirectly leads to the change of the conditions of the ice dam.In general,the incoming water is related to the conditions of the ice dam.However,if the opening of Xingan River first,the change of flow rate after the release of water flow will increase the uncertainty of the ice dam.