论文部分内容阅读
随着港口码头向深水大吨位化的发展,新扩建防波堤逐渐向深水区延伸,防波堤受到的波浪荷载强度越来越高,当堤基位于海底软黏土层上时,由于地基承载力低,往往考虑轻型防波堤结构,在某一防波堤延伸段工程中就推出了薄壁箱筒型基础防波堤新结构。然而,这类轻型防波堤能否经得住设计波浪荷载的作用以及它的性状为工程师所关注,故希望通过土工离心模型试验,在高速旋转的离心力场中模拟作用于防波堤结构上波浪荷载作用,观察其动态反应特性。根据电磁激励器原理研制开发了一套非接触式循环波浪荷载模拟器系统,能提供不同频率、幅值高达1200 N的不对称周期性往复荷载,满足了波浪荷载模拟需要。文中随后介绍了该装置在箱筒型基础防波堤结构与地基的波浪荷载作用试验中的应用,试验测量了防波堤结构的水平变位、沉降和倾斜以及地基中孔隙水压力等性状反应,基于模型试验结果,探讨了波浪荷载作用下箱筒型基础防波堤的破坏模式,结果发现,主要破坏模式为防波堤倾斜过度而失稳或水平变位超出容许值而发生侧向滑动破坏。
With the development of the large tonnage of deep-water terminals in the port, the newly-expanded breakwater gradually extends to the deepwater area and the wave load strength of the breakwater is getting higher and higher. When the foundation is located on the soft clay layer of the seafloor, due to the low bearing capacity of the foundation, Considering the light breakwater structure, a new thin-walled tank-type foundation breakwater structure was introduced in a certain breakwater extension project. However, whether this type of light breakwater can withstand the design of wave loads and its characteristics is of concern to engineers, it is hoped that the centrifugal load acting on the breakwater will be simulated in the centrifuge field under high speed rotation through geotechnical centrifuge model tests. Observe its dynamic response characteristics. According to the principle of electromagnetic actuator, a set of non-contact cyclic wave load simulator system has been developed to provide asymmetric periodic reciprocating loads with different frequencies and amplitude up to 1200 N, which meets the requirement of wave load simulation. The application of the device in the wave-load test of box-type foundation breakwater structure and foundation is introduced in the paper. The horizontal displacement, settlement and inclination of the breakwater structure and the pore-water pressure response in the foundation are measured. Based on the model test As a result, the failure mode of the box-type foundation breakwater under wave loads was discussed. It was found that the main failure mode was the lateral sliding failure caused by the instability or horizontal displacement of the breakwater exceeding the allowable value.