Analysis Of Slope Stability And Strength Of Dock And Platform When Hauling57000t Ships Into The Water

As the vigorous development of shipping transportation, the business volumes of acompany constantly expand. The production scale of existing dock has been unable to meetthe requirements of the company’s development. Therefore, the further expansion for existingdock is needed, in order to acquire bigger business display space. Based on this, the companyhas built a platform at side of the existing dock, and six rail beams have been added in theplatform. The company has newly signed the shipping contracts of a batch of ships withdisplacement of57000t. After the manufacture of ships in shipway is completed, the companyhas planned to haul them into a semi-submersible barge and to be launched along the sideslope bordering on land and platform behind dock, the platform and the dock. Because thedock and platform are the existing infrastructures, the requirement of ships with displacementof57000t to be launched is not taken into account. In order to examine if ships could safelypass through the side slope and if the hull subsection of dead weight of5000t(ship withdisplacement of57000t is divided into two subsections, and the dead weight of eachsubsection is5000t) could be safely hauled into the water by using air bags on the existingplatform and dock, the calculation and checking for the slope stability and the strengths ofdock and platform structures are essential.Whether or not some infrastructures of a shipping base can bear the dead weight5000t ofhull subsection and it can be safely hauled into semi-submersible by using air bags, it dependsmainly on the potential bearing capacity of these infrastructures. The so-called " potentialcapacity" indicates those capacities which can provide the safety use except for the ratingindex of design. The development and utilization of these capacities have importantsignificance for the successful change of use function of the existing structures and thereasonable increase of the existing working loads.The main works of the present paper are as follows.1. The calculation and evaluation for the slope stability at side of the platform behinddock are performed by using a circular sliding method and a professional software ofrock-soil named Lizheng. The conclusion of whether or not the dead weight5000t of hullsubsection can safely pass through the side slope is obtained. 2. According to the existing dock and platform structures, the modeling of thecorrespondingly representative structure sections is performed by using the finite elementsoftware ANSYS. In the light of the relevant information, the internal force and deformationof various components under each actual condition are simulated. The calculation andchecking of strength are performed by using the probability limit state design methodexpressed by subentry coefficients and according to Load Code for the Design of BuildingStructures, Load Code for the Design of Port Engineering, etc.. According to the final resultsof calculation and checking, the conclusion of whether or not the dead weight5000t of hullsubsection can safely pass through the platform and the dock is given, which provides thetheoretical basis for the safety use of some infrastructures of shipping base.