浅谈帕纳杜拉渔港南防波堤延长项目施工组织管理

通过对援建项目强化施工组织管理,优化资源配置以保障施工进度,比选施工方案以确保作业高效,最终实现项目提前优质完工,加强了中国政府在斯里兰卡民众心中的诚信度、美誉度和认知度。     

INTERACTION BETWEEN WAVES,STRUCTURES AND SAND BEDS

ＩＮＴＥＲＡＣＴＩＯＮＢＥＴＷＥＥＮＷＡＶＥＳ，ＳＴＲＵＣＴＵＲＥＳＡＮＤＳＡＮＤＢＥＤＳ￥ＧａｏＸｕｅ－ｐｉｎｇ（Ｄｅｐｔ．ｏｆＷａｔｅｒＲｅｓｏｕｒｃｅｓ＆ＨａｒｂｏｕｒＥｎｇ．，ＴｉａｎｊｉｎＵｎｉｖ．，Ｔｉａｎｊｉｎ，３０００７２，Ｐ．Ｒ．Ｃ...     

S型桨叶捕能消波浮式防波堤仿真及试验研究

为了促进开放海域海养殖装备智能化、无人值守化发展,解决离岸养殖装备自主供能以及安全防护问题,针对所提出的Savonius型（S型）桨叶捕能消波式浮式防波堤,建立二维波浪数值水池,搭建物理水槽试验系统和海试系统,通过仿真和试验研究系统在不同结构参数下的水动力学特性,分析探究相对间距、相对入水深度、波陡对系统捕能消波性能的影响. 研究结果表明：该防波堤系统能同时进行捕能和消波,其捕能性能随着波陡的增加而增加,在周期1.6 s时捕能效果最好;消波性能随相对间距的增加而变好,透射系数为0.2~0.8,消波效果显著. 系统捕能与消波性能存在相互影响,多数情况下两者不能同时达到最佳. 海试运行测试验证了该型防波堤的捕能消波效果.     

Time-domain hydrodynamic analysis of pontoon-plate floating breakwater

The hydrodynamic behaviors of a floating breakwater consisting of a rectangular pontoon and horizontal plates are studied theoretically. The fluid motion is idealized as two-dimensional linear potential flow. The motions of the floating breakwater are assumed to be two-dimensional in sway, heave, and roll. The solution to the fluid motion is derived by transforming the governing differential equation into the integral equation on the boundary in time domain with the Green’s function method. The motion equations of the floating breakwater are established and solved with the fourth-order Runge-Kutta method to obtain the displacement and velocity of the breakwater. The mooring forces are computed with the static method. The computational results of the wave transmission coefficient, the motion responses, and the mooring forces of the pontoon-plate floating breakwater are given. It is indicated that the relative width of the pontoon is an important factor influencing the wave transmission coefficient of the floating breakwater. The transmission coefficient decreases obviously as the relative width of the pontoon increases. The horizontal plates help to reduce the wave transmission over the floating breakwater. The motion responses and the mooring forces of the pontoon-plate floating breakwater are less than those of the pontoon floating breakwater. The mooring force at the offshore side is larger than that at the onshore side.     

基于N-S方程的波浪与可渗防波堤相互作用的数值模拟

采用N-S方程作为波浪场和孔隙流域的控制方程,应用有限差分方法对控制方程进行离散求解,采用VOF方法跟踪自由表面,反复迭代求解得到整个流域的压力场和速度场,并分析堤后渗透波高随入射波高、入射波周期的变化规律。最后结合波浪水槽物理模型试验验证本文所建立的数学模型,验证结果表明,此文所建立的数学模型可较好的模拟波浪与可渗防波堤的相互作用。     

Working mechanism and numerical simulation of assembly coastal building techniques

A new coastal technique, named as assembly coastal building, was introduced. The main concept of the technique was the assembling components which could be combined and locked together to form a large caisson. The assembly coastal building technique was used in a sea access road in Zhuanghai 4X1 well, Dagang Oilfield. The design plans and in-situ tests in the sea access road project were introduced in detail. According to the Zhuanghai project, the numerical simulation method of assembly coastal building technique was proposed. 2D numerical simulations were performed in FLAC to analyze the displacement and stability of the technique in the construction process and post-construction period. The settlement calculated is close to the in-situ results, which proves that the proposed numerical method is reasonable. Results show that the assembly coastal building technique has large safety factor under the gravity loading and wave loadings.     

爆炸夯实法处理海堤抛石基床

文章介绍温岭石塘中心渔港１＃防波堤大面积水下爆夯的工程实例,总结了一套海上抛石基床爆炸夯实施工方法及工艺技术。     

新型桶式基础防波堤下沉分析及其对稳定性的影响

鉴于新型桶式基础防波堤下沉过程的复杂性,单纯少量的下沉监测并不能全面、细致地反映这一过程。通过对桶体的简化处理,借鉴静压桩的下沉模拟方法,采用ABAQUS有限元软件对桶体的下沉挤土效应进行了模拟分析。通过分析发现,受桶体下沉影响,桶壁附近土体主要受到了桶壁水平挤压作用、紧靠桶壁的竖向挤压及摩擦作用及两桶壁之间盖板的竖向挤压作用。受几种作用的影响,桶壁附近的土体变形可分为紧靠桶壁的下沉区域、离桶壁稍远范围内的相对隆起区及两桶壁之间顶部的下压变形区,而且土体的这些变形决定了桶壁附近土体复杂的应力变化。在挤土效应模拟的基础上,进一步分析了考虑挤土效应对桶体稳定性的影响,挤土效应可增加桶体的稳定性。     

抛石防波堤堤内波浪运动的数值模拟

将抛石防波堤认为离散介质结构,根据抛石防波堤内块体随机堆放的特点生成断面,对块体间的孔隙域划分网格。基于二维粘性不可压缩流体的N-S方程和流体自由表面处理的VOF方法,建立了波浪作用下堤身内部和前后流场的有限元数值模拟模型,对堤内的波浪运动进行了数值模拟。数值计算结果与波浪水槽模型实验结果基本吻合。对不同孔隙率和块体粒径的抛石堤计算结果表明,抛石堤内的波浪场受到很多参数的影响,孔隙率越大波长越长透射系数也越大,块体上的受力随着防波堤孔隙率以及块体平均半径的增加而减小。