【摘要】 波浪诱发砂质海床液化导致的海洋工程事故屡屡发生,开展有效防治液化的工程措施是海洋工程建设的关键所在。受模型比尺限制,在1g模型水槽内难以生成诱发海床液化的波浪条件,采用了大连理工大学最新建设的、国内唯一的大型土工鼓式离心机GT450/1.4开展了生成线性规则波浪的离心模型试验研究工作。其中自主开发了基于200 W直流伺服电机驱动装置的机械造波系统,结合鼓式模型槽长度较大的技术优势,设置了斜坡式多孔钢板构成的消波装置。整套造波系统可以生成不同浪高和频率的线性推进波,试验中通过微型孔隙水压力传感器和自制的浪高仪量测波压力和波高,并通过波浪理论验证了所生成波浪的有效性。与以往离心机中的造波装置相比,本套系统的优势在于能够在较大尺寸的环形波浪槽中生成更强烈度的波浪,为今后波浪诱发海床液化的研究提供了技术保障。更多还原

【Abstract】 Wave-induced seabed liquefaction has caused many serious disasters in the offshore engineering constructions.How to prevent such liquefaction has been a key point in the design of offshore engineering.Because of the limitation of model scale,however,it is very difficult to create in the flume of 1g model the wave conditions under which the seabed liquefaction can be induced.A study on centrifugal model test for generating linear progressive waves was carried out by using a GT450/1.4drum centrifuge,which was designed by Dalian University of Technology in 2009and is the only one in China.The wave generation system includes a paddle wave maker driven by a servo motor of 200Wand a beach wave absorber,which is able to create linear progressive waves with different wave heights and wave frequencies.The wave pressure and wave fluctuation can be measured by means of mini pore pressure transducers and a self-developed wave height gauge.The validity of the waves thus generated has been verified by wave theory through analyzing a series of test results.Compared with previous centrifugal wave makers,the advantage of this new system is that it can generate waves with even higher degree in a ring-like and larger wave flume.This will provide a technical basis for the future study of wave-induced seabed liquefaction.更多还原