| Ice Tourism and other projects in Northeast China have been developed and applied more in recent years.During construction,the ice layer is generally in the initial growth stage,which is often accompanied by some ice safety accidents.There is an urgent need for ice thickness data observation and bearing capacity analysis during construction.The field observation of ice thickness data takes a long time and has certain potential safety hazards.Based on the actual needs of the ice construction and ice activities of the Songhua River ice and snow Carnival project,this paper analyzes the ice growth in the Songhua River flood control memorial tower section,determines the calculation formula of the ice thickness by the daily freezing degree method,and calculates the corresponding ice bearing capacity according to the ice thickness prediction results.The main research contents and conclusions are as follows:(1)From 2019 to 2020,ice thickness observation was carried out in Songhua River flood control memorial tower section.Ground penetrating radar and field drilling were used to observe ice thickness data.The temperature data was collected by Campbell CR1000 data acquisition instrument and thermistor temperature probe.By analyzing the ice thickness data and drawing the scatter map of ice thickness,it can be concluded that the ice thickness of Songhua River flood control memorial tower section basically decreases from the bank to the center of the river,but there are local regional differences due to the influence of construction and ice activities.Human factors have a certain influence on the growth of ice thickness.According to the distribution after the ice,it is suggested that the amusement facilities in the park should be planned according to their own load and passenger flow,and the layout from large to small along the bank to the center of the river,so as to improve the construction safety at the initial stage of ice growth.(2)Based on the existing ice thickness calculation formula of the ice degree day method in the Songhua River Basin,input the temperature and other relevant data,and calculate and simulate the ice thickness change map of the Songhua River flood control memorial tower section from 2019 to 2020.Based on the measured ice thickness data of the Songhua River flood control memorial tower section from 2019 to 2020,it is found that this formula has some errors in simulating the ice thickness data of the Songhua River flood control memorial tower section.Take the measured ice thickness on December16,2019 as an example,The measured average ice thickness is 27.20 cm,the simulated ice thickness is23.63 cm,the error value is 3.57 cm,and the simulation accuracy is 84.89%.Based on the measured ice thickness data and temperature data,the formula is fitted to determine the relevant parameters,determine the calculation formula of ice thickness by freezing degree day method in Songhua River flood control memorial tower section,and draw the growth and change diagram of ice thickness from2019 to 2020.(3)Based on the analysis of the characteristics of the ice in the basin,it is judged that it is the column ice with thermodynamic growth.According to the relevant articles,the average bending strength of the in-situ cantilever beam of the thermodynamic column ice measured on the ice layer in Nenjiang in the winter of 2016 is 495 kpa,and the average elastic modulus is 5.10 gpa,which is brought into the simple formula for calculating the ice bearing capacity.The bearing capacity of the cracked ice layer and the uncracked ice layer under the conditions of short-term load and long-term load are calculated respectively during the project.According to the simulation calculation results of ice thickness,the table of ice bearing capacity corresponding to some winter dates from 2019 to 2020 of Songhua River flood control memorial tower section is obtained,which provides a reference for ice construction and related activities. |
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