Data Base for Geotechnical Properties of Sea Bed and Their Design Parameters

本文采用关系模型开发了一个海底岩土工程信息数据库系统。本文着重讨论了该数据库的一般系统，以便在设计和研究工作中得到实际应用。安装的数据仅限于大坂港区域和距离大坂湾海岸线1或2 km的近海区域。根据该数据库的应用程序设计，可以看出，数据的三维图示是公认的最有价值的表达系统。对输入数据的可靠性进行了研究，并对输入过程中的校核系统进行了探讨，讨论了海床动力特性、围垦地不均匀沉降和长期固结特性等离岸建筑物的设计参数。前者是粘性土的动模量，并研究了动刚度对侧限应力和孔隙比的依赖性。后者主要考虑海床洪积粘土层的特性，认为预测填海造地的次压缩率应根据长期固结试验结果确定，海床岩土信息数据库可有效地用于设计参数的确定。

An sea bed-geotechnical information data base system is developed by use of a relational model. We mainly discuss the general system of this data base for the practical application in design and research works. The data installed are limited In the area of Osaka Port and off-shore area 1 or 2 km apart from the Coastal line of Osaka Bay. According to the application programming of this data base, it is seen that three dimensional illustration of data is recognized as the most valuable expression system. The reliability of the input data is also very important and the cheeking system in the enputting process is investigated.The design parameters for off-shore structures are discussed about dynamic properties of sea bed and differential settlement and longterm consolidation characteristics of reclaimed lands. The former is the dynamic moduli of cohesive soils and the dependency of the dynamic rigidity on the confined stress and void ratio is also investigated. The latter Is mainly considered for the behavior of diluvial clay layers of sea bed and it is seen that the secondary compression rate for the prediction of reclaimed lands should be decided by the longterm consolidation test results.The sea bed-geotechnical information data base could be used in this decision of design parameters effectively.