Feasibility Study On The Anti-collision Scheme Of The Baiheliang Underwater Museum’s Corridors

There is a large risk of vessel collision with corridors of the Baiheliang Underwater Museum after the impoundment of the Three Gorges Dam.In this paper,the feasibility of the arch self-floating anti-collision device and the double platform frame concrete anticollision device is studied by combining with the construction of the anti-collision device of the Baiheliang Underwater Museum’s slope corridors.The anti-collision ability of two kinds of anti-collision device and the influence on the flow condition after anti-collision device set up are calculated.A better anti-collision scheme is selected through the analysis of the calculation results of the two kinds of scheme.The main work and conclusions of this paper are as follows:Firstly,the ABAQUS/Explicit dynamic analysis module is used to analyze the structural force characteristics and the anti-collision ability of the two kinds of anticollision devices through the three-dimensional finite element simulation method.The results show that the double-frame frame-type anti-collision device with Concrete of C30 is damaged under various working conditions.The pile of the vertical and horizontal are impacted with large deformation,the tensile strength and compressive strength of concrete more than standard strength of the C30 concrete.The floating anti-collision arch device with Q420 steel material due to the flexible is better,the impact would produce a certain amount of displacement.Most of the working condition of collision area produce elastic deformation,only in distance from vault 2/8 with 5000 t ship will appear a small plastic deformation.The overall structure is safe and reliable and satisfies the requirement of collision avoidance.Also,the arch shape of anti-collision device can move the bow of the ship,make the ship away from dangerous collision zone.The arch self-floating anticollision scheme is better than the double platform frame concrete type anti-collision device scheme on the impact effect,and the first one can protect slope corridor well.Secondly,ANSYS FLUENT is used to simulate the influence of the surrounding water flow condition by three-dimensional computational fluid dynamics method after two kinds of anti-collision devices are set up.The calculation results show that double platform frame type anti-collision device with overhead structure has less impact on the downstream flow conditions,but it has a greater influence on the flow velocity.Compared with the same cross section near the shore side flow channel section velocity is small,and resulting in backwater height is higher.The arch self-floating anti-collision device due to using the type of half surrounded and floating structure,there is less influence in the downstream side of the anti-collision device while the backwater height is low.Finally,based on the calculation results of structure and fluid,the feasibility of applying two kinds of anti-collision devices to Baiheliang Museum is analyzed.Through the analysis of the limit impact angle,it is found that the double platform frame type anticollision device still has the risk of the ship impact downstream slope corridor in the three water levels.The arch self-floating anti-collision device can protect the slope corridor in all directions.The concrete piles of double platform frame anti-collision device in the low water is exposed in the water,and piles stand,which affect the overall landscape of the museum.The anti-collision zone and buoy of the arch self-floating anti-collision device can lift with the range of the water level by their own buoyancy force.And there is no effect of damaging the overall slope of the protection,it is in harmony with the surrounding environment.