爆炸处理地基方法在渔港防波堤工程中的应用

文章介绍爆炸处理地基的实例，包括堤端推进爆填、边坡拓宽爆填、加抛密实爆夯、边坡整理爆夯的方法及效果。     

新型桶式基础防波堤桶体阻力分析

包括桶壁、隔墙摩阻力和桶底端阻力的桶体阻力是维持桶体稳定性的一个重要因素。外侧桶壁摩阻力与桶土相对位移及接触状态有关,内侧桶壁和隔墙摩阻力与桶土相对位移有关,桶底端阻力与桶土接触状态有关。波浪荷载作用下,海侧上部的外侧桶壁与土体脱离,下部产生相对土体的向上位移,陆侧桶壁则相反;海侧内侧桶壁与隔墙产生相对桶内土体的向上位移,陆侧则相反;海侧桶体底部与土体脱离,陆侧则挤压土体。波浪荷载作用下,在绕桶体转动中心发生向上位移的迎浪侧,随荷载水平增加,桶壁与隔墙摩阻力由桶体自重作用下的正摩阻力减小变为负摩阻力,桶底端阻力则减小直至为零;在绕桶体转动中心发生向下位移的背浪侧,桶体阻力在桶体自重的基础上增加。     

金平防浪堤爆破挤淤工程对附近水域及岸上建筑物的影响分析

根据工程的地域特点和工程的施工要求，分析了爆破挤淤技术的原理、参数的选择和可能造成的影响，提出了减小影响的措施，论证了合理地选择爆破参数、采用爆破挤淤技术的可行性。施工实践证明用爆破挤淤技术建设防浪堤是成功的。     

地基加固对沉入式钢圆筒防波堤抗震性能影响研究

为研究地基加固对沉入式钢圆筒防波堤抗震性能的影响,通过数值模拟和振动台试验分析了地基加固前后防波堤的动力响应,并根据国际航运协会《港口结构抗震设计指南》评估了防波堤抗震性能,同时研究了筒外回填砂不同加固范围对防波堤抗震性能的影响。结果表明地基加固后防波堤在Level 1和Level 2时损伤程度均为可服役,满足抗震性能要求;当不同地震波作用于防波堤时,地基加固后防波堤顶部水平残余位移比地基加固前减少约60%以上;通过对防波堤筒外回填砂不同加固范围时的抗震性能进行研究,明确了合理的加固范围,可为相关研究提供参考。     

新型透空格栅板式防波堤消浪性能试验

为提高透空式防波堤的消浪效果,提出了一种新型透空格栅板式防波堤结构。通过水槽试验,分析了该防波堤的消波性能,探讨了上下层平板相对间距以及格栅板间隙比等参数对防波堤透射系数和反射系数的影响。结果表明,该结构防波堤消波性能良好,且防波堤出水状态下的消浪效果要好于淹没状态;随着相对板间距的增大,防波堤透射系数变小;上下层各格栅板间隙比为0.1时,防波堤的消波效果最佳。     

Genetic algorithm based support vector machine regression in predicting wave transmission of horizontally interlaced multi-layer moored floating pipe breakwater

Planning and design of coastal protection works like floating pipe breakwater require information about the performance characteristics of the structure in reducing the wave energy. Several researchers have carried out analytical and numerical studies on floating breakwaters in the past but failed to give a simple mathematical model to predict the wave transmission through floating breakwaters by considering all the boundary conditions. Computational intelligence techniques, such as, Artificial Neural Networks (ANN), fuzzy logic, genetic programming and Support Vector Machine (SVM) are successfully used to solve complex problems. In the present paper, a hybrid Genetic Algorithm Tuned Support Vector Machine Regression (GA-SVMR) model is developed to predict wave transmission of horizontally interlaced multilayer moored floating pipe breakwater (HIMMFPB). Furthermore, optimal SVM and kernel parameters of GA-SVMR models are determined by genetic algorithm. The GA-SVMR model is trained on the data set obtained from experimental wave transmission of HIMMFPB using regular wave flume at Marine Structure Laboratory, National Institute of Technology, Karnataka, Surathkal, Mangalore, India. The results are compared with ANN and Adaptive Neuro-Fuzzy Inference System (ANFIS) models in terms of correlation coefficient, root mean square error and scatter index. Performance of GA-SVMR is found to be reliably superior. b-spline kernel function performs better than other kernel functions for the given set of data.     

新型透空组合板式防波堤结构型式及消浪特性分析

为提高透空式防波堤的消浪性能并减小结构受力,在前人研究基础上提出了一种新型透空组合板式防波堤,比较分析了该型式的防波堤(模型c)与另外两种型式的防波堤(模型a和模型b)的结构特点。通过物理模型试验,探讨了模型c在不同影响因素下的消浪特性,并对比分析了模型a与模型c的透射系数、反射系数和能量耗散系数在不同相对堤宽下的变化关系,比较了两种模型的消浪效果。分析得出,由于模型c兼具开孔水平板式防波堤和开孔挡板式防波堤的作用,模型c的波浪反射小于模型a,消浪效果优于模型a,且模型c这种结构能有效减小防波堤结构受力;当模型宽度和相对间隙比同时较大时消浪效果更好,防波堤出水后的消浪性能要优于淹没状态下的防波堤。     

桶式基础气压模型试验和有限元分析

桶式基础结构是一种适用于软土地基的新型海工结构。为保证结构的可靠性,已对桶式基础使用期的承载力、稳定性和水动力特性进行了大量试验研究,但施工阶段的性状并未得到足够关注。为此制作了1∶8的小比尺模型并进行室内试验,研究设计规定的正压和负压下结构模型的内力、变形和气密性,获取了测点应变-加载时间的关系曲线。采用通用有限元软件ABAQUS对模型进行了弹性有限元分析并与试验结果比较。研究表明,桶式基础模型能承受设计规定的正压力和负压力,模型混凝土和钢筋应变变化规律与加压规律大体相符;弹性有限元分析结果与试验结果基本吻合。     

深水浮式防波堤结构形式的试验研究

介绍选取三种结构形式（单箱式、双箱式和板网式）的浮式防波堤进行实验室物理模型试验研究，得到在规则波浪作用下三种形式的浮式防波堤的消浪效果．结果表明板式结构的消浪性能最好．具有良好的工程应用前景。     

WAVE MOTION OVER TWO SUBMERGED LAYERS OF HORIZONTAL THICK PLATES

This study investigates the hydrodynamic performance of a submerged two layer horizontal plate breakwater. The plate thickness is considered as non-zero in the study. In the context of linear potential theory, an analytical solution for interaction of water waves with the plates is obtained using the matched eigenfunction expansion method. The solution consists of a symmetric part and an antisymmetric part. Its validity is confirmed by comparing the numerical results of reflection and transmission coefficients for limiting cases with previous predictions. Numerical examples are given to examine the major factors that affect the reflection and transmission coefficients of the plates. Some useful results are presented for engineering design.