尼日利亚SABKE大坝地基处理设计

通过介绍在尼日利亚SABKE大坝地基处理过程中，如何因地制宜，综合采用多种地基处理措施成功处理坝基渗漏问题，并取得显著经济效益；为今后类似工程提供借鉴．     

南海东部某油田地震成像畸变下的构造恢复

海上油气田开发到中后期,构造研究的精细程度直接影响到油藏的开发效果。针对南海东部油田开发中低幅度构造的地震成像畸变问题开展了研究。首先,为了消除断层阴影对于构造的影响,通过对断层附近成像畸变分析,根据层位和断层控制建立速度模型,准确恢复断层附近的速度场,有效消除断层阴影影响,精细恢复断层阴影带内的低幅度构造特征;然后通过高分辨率反演刻画浅层异常体分布,进行速度校正,以消除浅层异常体对构造影响。在地震成像畸变的情况下,将测井数据和地震数据相融合,并结合地震速度和地质规律分析相互验证校正构造解释,取得了较好的应用效果,为油田地质和油藏研究提供了准确的基础数据。     

Snap Tension in Mooring Lines of Deepwater Platform

Based on the theory of impact dynamics, the motion equations for a mooring line-floating body system before and after impact loading are established with consideration of the viscoelastic property of mooring lines. The factors that influence the taut-slack conditions of a mooring system are analyzed through classifying the taut-slack regions, which are defined by non-dimensional ratios of displacement, frequency, and damping of the system. The mooring system of Jip spar platform is analyzed, and the snap te...     

海洋系泊工程中合成纤维系缆研究述评

在回顾合成纤维缆绳的分类和工程应用的基础上,概述了各类纤维缆绳的优缺点和工程适用性。介绍了合成纤维系缆实验技术的国内外研究进展,并综述了合成纤维缆绳的破断强度、动刚度、蠕变、蠕变回复、蠕变破断和疲劳破坏的研究现状,在此基础上展望了今后需要继续开展的合成纤维系缆研究方向。这将为海洋系泊工程中合成纤维系缆的研究和应用提供重要参考。     

复杂场地上结构地震反应的研究

介绍了局部复杂场地上结构震害异常的实例。使用显式有限元法分析了陡坎和山坡止方结构地震反应的特点，计算结果表明，复杂场地上地面运动的差动对结构地震应力的影响是不容忽视的。     

新型测绘视角下的山地城市规划实施场景预警模拟技术探索

面向支撑自然资源部“两统一”职责履行和基础测绘“两支撑、一提升”根本定位,测绘行业更新、技术创新、产品革新体现出更加聚焦应用服务导向的特点。在新型测绘智能化转型的视角下,本文聚焦自然资源管理中国土空间规划实施与监督环节,针对城市尺度规划实施场景预警指标的多样性和场景构建的复杂性等问题,探索了一套服务于山地城市规划实施场景预警模拟的技术框架,并在典型区域开展建(构)筑物水位动态淹没预警模拟应用示范,支撑规划编制与动态维护的后续环节,助力国土空间规划形成闭环管理。     

Fatigue analysis of the taut-wire mooring system applied for deep waters

Precisely predicting the fatigue life of taut-wire mooring systems has become an interesting and important problem for scientists and engineers since there are still difficulties in the inspection and maintenance of mooring lines in a rough sea environment especially in deep waters. In this paper, a comprehensive fatigue analysis is performed for a polyester taut-wire mooring system of an FPSO based on the time domain dynamic theory, rainflow cycle counting method and linear damage accumulation rule of Palmgren-Miner. Three influential factors in the fatigue analysis including the pre-tension, dynamic stiffness and T-N curve are investigated in detail. Two polyester T-N curves, one is from the DNV- OS-E301 and the other is from the API-RP-2SM, are adopted in the calculation. The fatigue analysis of the mooring system after one-line failure is also carried out. The calculation results indicate that the fatigue life is significantly affected by the T-N curve. The fatigue life decreases with increasing pre-tension, and is largely reduced if taking into account the dynamic stiffness caused by cyclic loading. The analysis also proves that one-line failure has remarkable effects on the fatigue lives of other mooring lines. The present parametric and comparative study is believed to be meaningful to further understanding of the taut-wire mooring system for deepwater applications.     

浅谈对“混合土”的认识及其地基处理

“混合土”是一种特殊性土,成分复杂,粒径悬珠,力学性质变化较大。本文以株洲市南华花园地区“混合土”为例,剖析了勘察中应注意的事项,阐述了动力触探是对“混合土”勘察的有效手段,并结合工程实际情况,提出了相应的地基处理措施。     

不同时间尺度下农田土壤风蚀可蚀性的变化

土壤风蚀可蚀性(简称土壤可蚀性)作为风蚀模型的必要输入参数之一,会随风蚀事件过程、耕作措施以及气象气候等因素发生显著变化,但目前对其变化趋势尚认识不足.本文采用野外观测、采样分析与空间换时间的方法,就次风蚀事件、风蚀月、风蚀季、多年4个时间尺度下坝上地区农田土壤可蚀性变化问题进行研究.结果 表明:严重风蚀事件过程中,地...