Different Ice Velocity Semi-circular Component Of Ice Force Testing And Research

The semi-circular breakwater is a reasonable forcing, widely applicable and economical late-model structure of coastal engineering and which is selected to be an especially popularized technology by National Ministry of Communications. The purpose in researching ice force on the semi-circular breakwater at different ice velocities is to provide evidences for sea ice load design when building semi-circular breakwater in the ice-infested Bohai Sea. As a part of project of National Natural Science Foundation of China - sea ice break and pile-up processes in front of semi-circular breakwater (50179003), this paper performs tests on ice-semi-circular breakwater interaction and ice force on the semi-circular breakwater at different ice velocities, and analyzes the effect of velocity and angle on ice forces.Test system and technology are the base of tests, whose reliability are the key of success. Combing with the character of this project, the author firstly introduces relative experiment system and technology, and measures relative technical parameters. Secondly based on theory of Croasdale, tests the test system and technology by use of inclined slope walls, and reliability are shown by results, and then the farther test indicates that the system and technology are suitable for semi-circular breakwater.Thirdly 81 group model tests of semi-circular structure with 6 tangent angles (30, 35, 45, 60, 70, 80), 5 velocities (5cm/s, 15cm/s, 26cm/s, 37cm/s, 48cm/s) and 3 model ice thicknesses (8mm, 10mm, 16mm) are done, then empirical formula of ice forces on physical model of semi-circular structure is educed as follows: the horizontal ice force isFhi= Fhf+ Fhc+Fhp= aIlD fE-0.25h1.25+ bI2D ch + cpiDhr(1- cos a) the vertical ice force isand the parameters of this formula are confirmed synchronously.Finally the author compares the result of this formula with test result of Tianjing University, and analyzes the difference between them; all the conclusions indicate wide applicability and reliability of this formula.