Study on Hydrodynamic Coefficients of Double Submerged Inclined Plates

Added mass and damping coefficients are very important in hydrodynamic analysis of naval structures. In this paper, a double submerged inclined plates with ‘/ \’ configuration is firstly considered. By use of the boundary element method (BEM) based on Green function with the wave term, the radiation problem of this special type structure is investigated. The added mass and damping coefficients due to different plate lengths and inclined angles are obtained. The results show that: the added mass and damping coefficients for sway are the largest. Heave is the most sensitive mode to inclined angles. The wave frequencies of the maximal added mass and damping coefficients for sway and roll are the same.     

Analysis of pullout load capacity of suction caissons in clay by a three-dimensional displacement approach

A study was made to present analytical solutions of pullout load capacity for a suction caisson subjected to inclined tension in clay. The inclined tension on the skirt of the suction caisson is transformed into an equivalent system comprised of the vertical, horizontal, and moment load applied on the center of the lid. The vertical and horizontal stiffness coefficients along the skirt of the suction caisson in clay are presented by three-dimensional elastic solutions considering the nonhomogeneous and nonlinear property of clay. The vertical, horizontal, and rocking stiffness coefficient of the suction caisson on the base are presented considering the solutions of a hollow rigid cylindrical punch acting on the surface of clay. The envelopes of the horizontal and vertical ultimate load capacity for clay are presented. The yield, pullout, and failure for clay are taken into consideration. The effects of load inclination, loading depth, and aspect ratio on the pullout load capacity are shown. Behavior of the suction caisson in clay up to failure is investigated using the relationship between tensile load and displacement and that between depth, vertical, and horizontal pressure.     

边坡倾倒变形的形成机制与影响因素分析

本文从边坡倾倒的变形特点出发,分析了倾倒变形的力学机制。在此基础上研究了结构面间距及力学参数对变形的影响。通过含有结构面的岩体的应力,位移以及屈服区的分布特点,讨论了反倾边坡的稳定性问题。     

Measuring solar irradiance profiles in the Arctic sea ice using fiber optic spectrometry via inclined holes

An irradiance profile measurement approach and profiling system were developed to measure the solar irradiance profile of the Arctic sea ice using fiber optic spectrometry. The approach involved using a miniature spectrometer to sense light signals collected and transmitted from a fiber probe. The fiber probe was small, and could thus move freely in inclined bore holes drilled in sea ice with its optical entrance pointing upward. The input-output relationship of the system was analyzed and built. Influence factors that determined the system output were analyzed. A correctional system output approach was proposed to correct the influence of these factors, and to obtain the solar irradiance profile based on the measurements outputted by this system. The overall performance of the system was examined in two ice floes in the Arctic during the 9 th Chinese National Arctic Research Expedition. The measured solar irradiance profiles were in good agreement with those obtained using other commercially available oceanographic radiometers. The derived apparent optical properties of sea ice were comparable to those of similar sea ice measured by other optical instruments.     

巫山望霞危岩应急勘查钻探施工方法

巫山望霞危岩加剧变形崩塌,严重威胁当地居民及长江航运的安全,引起重庆市人民政府及国土资源部的高度重视。危岩应急抢险勘查的钻探施工是查清危岩裂隙发育程度和延伸方向、获得岩土力学参数的重要手段。通过现场踏勘后进行难点预测并制订对策措施。采用金刚石单动双管钻进取心,成功采取了危岩基座软弱带样品;采用井中成像技术,直观地反映了危岩裂隙发育状态。在施工组织管理、设备选型、钻探工艺、井中成像技术以及安全措施等方面,为地质灾害的应急抢险勘查积累了经验。     

厄立特里亚Zara金矿大角度斜孔钻探施工技术

介绍厄立特里亚Zara金矿大角度斜孔钻探施工情况,重点针对防斜保直钻进技术要求、复杂地层护壁堵漏、“打滑”地层提速增效等钻探技术进行实践探索。阐述了钻具组合合理配置、冲洗液使用工艺、钻进参数合理选择、钻头合理选用等方面技术措施。在初次完成大角度斜孔钻探施工中摸索和积累施工经验,为今后类似项目的进一步开展打下技术和管理基础。     

钢管混凝土边框内藏带斜肋钢板中高剪力墙抗震性能试验

提出了钢管混凝土边框内藏斜撑肋钢板组合中高剪力墙.为研究这种组合剪力墙的抗震性能,进行了5个不同构造的中高剪力墙模型低周反复荷载试验.分析了试件的损伤特征、承载力、耗能、滞回特性,提出了正截面抗弯承载力计算模型,计算结果与试验符合较好.研究表明:钢管混凝土边框内藏钢板组合剪力墙具有较高的承载力和良好的耗能性能;钢管混凝土边框内藏带斜撑肋钢板中高剪力墙,适于在墙体厚度小于钢管尺寸或内藏钢板厚度较薄的“强边框、弱墙体”情况下应用,可明显减轻钢管混凝土边框底部的损伤,延缓墙体性能退化,提高组合剪力墙的抗震能力.     

下庄铀矿田湖子地区缓倾斜矿体的新发现及其找矿意义

在下庄铀矿田湖子地区发现有硅化带型、交点型及碱交代型铀矿化,并且以硅化带型铀矿化为主。深部钻探揭露显示,6009号硅化断裂带主带及其上盘次级构造带内的铀矿体在深部延伸比较稳定。在6009号硅化断裂带与黄陂-张光营辉绿岩组的深部交汇区内发现隐伏的缓倾斜铀矿体,该矿体严格受平缓断裂构造控制,根据已有地质成果与认识,推测铀矿体往深部延伸有变厚变富的趋势。深部隐伏缓倾斜铀矿体的发现,有望使湖子地区铀矿化点扩大成为中-大型铀矿床。     

断层相关褶皱解释之平衡剖面技术

从实际问题出发,扼要阐述了平衡剖面技术的基本概念,并结合实例着重探讨了其应用研究.在介绍了与平衡剖面有关的基本概念的基础上,总结平衡剖面技术的研究流程和平衡剖面结果的评价标准,结合缅甸区块实际资料深入探讨其在断层相关褶皱构造模式建立和检验调整地震解释以及在恢复挤压构造发育史方面的应用情况,显示了其在缅甸区块叠瓦状断层转折褶皱的良好应用效果,并获得剖面的水平延展量,同时也认识到许多潜在的客观问题,有待进一步探索.     

淮南煤田罗园井田地质特征及勘查工程布置

淮南煤田罗园井田构造是以阜凤逆冲推覆断层为主要断层组成的逆冲推覆构造系统。针对推覆体内含煤地层急倾斜、倒转以及总体呈"L"形构造形态特征,在二维地震勘查手段效果不理想的情况下,根据构造发育特征选择以钻探为主,布置了垂直钻孔、定向斜孔、分叉孔,并结合测井、采样测试等手段,取得了良好的地质效果。