共查询到19条相似文献，搜索用时 156 毫秒
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《海洋与湖沼》2004,35(2):155-155
在海洋地质学研究和海洋工程勘察项目中 ,海洋底质取样是一项必不可缺的工作。从当前使用的技术手段来看 ,对于我国各类水域大片分布的砂和硬粘土 (约占 4 0 %区域 )等未固结 半固结的硬底质沉积物 ,要获取保存完好的长岩芯 ,振动活塞取样器是一种简便 ,快捷的取样设备。与工程钻机相比 ,振动活塞取样器的优势主要表现在 4个方面 :一次可完成较大的穿入深度 ,并能获取连续、完整的岩芯 (而钻机往往需要用多个回次完成 ) ;工作消耗低、操作简便、灵活 ;取样效率高 (作业时船只无需抛锚 ) ;适用范围广。从国内多家相关单位的使用情况来看 ,目… 相似文献
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重力活塞取样器贯入深度研究对于取样效率的提高和仪器安全有着重要影响,根据取样海底沉积物类型及工程参数对取样器可贯入深度进行预判是研究的重点。基于重力活塞取样器结构,设计并制造了重量可调的重力取样器模型,增加了底质桶与支架等配套设施。按照控制变量法分别设计了针对取样器质量、贯入速度及沉积物类型的试验。试验结果表明,底质类型、取样器质量和贯入速度都可以对贯入深度产生不同程度的影响。在现有重力取样器贯入深度公式的基础上,根据本次试验得到的数据对其进行修正。改进后的公式计算结果与原来相比误差更小、更接近于真实取样数据。 相似文献
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南海北部深海平原晚更新世以来沉积环境和古气候变化 总被引：5，自引：1，他引：5
近年来,随着我国海洋地质事业的发展,对于深海海洋第四纪的调查研究工作已引起不少中外学者的注意及着手探讨,但对于南海海盆第四纪地质的调查研究报道甚少.1980年,笔者有机会参加中美联合进行的南海海盆的地质-地球物理调查,并在美国拉蒙特-多尔蒂地质观察所提供的深海远洋调查船“维玛号”(Vema)上,使用重力活塞取样器在水深1034—3821米的海底,采集了7个岩芯样品,具体位置(图1). 相似文献
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目前,国内外采用的重力活塞取样器,吊装完成后的状态如图1所示。如果从失衡定高杆挂钩到取样钻头的长度为L_1,失衡定高杆的长度为L_2,假定铅球触底后失衡定高杆倾斜60°重力活塞取样器主体脱钩,要求取样管自由下落高程h=3m,利用达到速度的冲击能取样,铅球链条的长度应为L_3。 相似文献
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箱式取样器是近年发展起来的一种比较理想的海洋地质调查工具,它结构简单,使用方便,采集样品不易受到扰动和破坏,而且还能为海洋生物、化学研究提供上覆水。因此,它在海洋地质、化学、生物等学科的调查研究中已经得到广泛的应用。老式的大洋50型采泥器已逐步被新型的箱式取样器所取代,我国的海洋地质调查研究工作进入了一个不断更新的阶段。箱式取样器以它的取 相似文献
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王安国 《海洋地质与第四纪地质》2014,(1)
<正>2014年1月13日,从第十三次李四光地质科学奖颁奖典礼上获悉,青岛海洋地质研究所张训华研究员荣获李四光奖野外地质工作者奖。坚守科研一线领军海洋地质调查张训华研究员自参加工作以来,一直坚守在科研一线。从参与重力异常场改正技术研究,到负责高精度重力调查,再到成为海上地质地球物理调查首席科学家;从主持小范围单一技术手段调查,到完成大范围标准分幅海洋区域地质调查编图,再到提出我国管辖海域的全覆盖海洋地质调查计划;一次次的提升,使他逐渐成为我国海洋地质调查的领军人物。 相似文献
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本文探讨了海洋沉积物的工程特性,以及为海岸工程地基而进行的海洋工程地质勘探方法。包括海洋工程地质测绘,海底钻探(Wirth型、MAS—73型、koken型及Maricor型海底钻探机械设备)、用重力、活塞、箱式取样器(管)进行水下取样、以及洋底沉积物钻孔剪切试验装置、旁压试验装置。 相似文献
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A pressure tight sediment samphng technology, which can be introduced into the modification of the piston corer to accommedate the investigation of gas hydrate, is put forward. In this paper, the three basic rules of the technology are analyzed in detail: specimen transferring rule, seal self-tightening rule and semi-active pressure holding rule. Based on these, the structure of the pressure tight piston corer is put forward and its working principle is analyzed. Finally, a pressure tight sediment sampler, to which the same technology is apphed, is researched through experiments. Results show that the sampler based on the above-mentioned theory has a good ability in samphng and in -situ pressure holding. 相似文献
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重力活塞取样器取样技术研究 总被引：3，自引：0，他引：3
现代海洋沉积物柱状取样技术是一套综合性的高新技术系统,它一般应该包括：优良的取样器具,方便灵活的取样操作设备,高精度的定位导航仪器和高分辨率的地形、地貌、地层探测系统等四个方面。我国和先进国家相比,取样操作设备方面差距最大,应该成为我国今后取样技术研究和发展的重点 相似文献
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A newly developed piston sediment corer utilising a neat‐fitting piston operating within a 2 7/8‐in.‐diameter plastic liner has successfully cored heavy gravel, coarse shell and sandy sediments. A quick fit and release junction for pipe lengths and cutter has been devised. 相似文献
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The paper presents the design and preliminary test results of a corer used for hard seafloor sediments sampling.Generally the sediment cores are provided by either gravity-type coring or deep-ocean drilling for a range of studies.However,in consideration of the operability and available sample length in collecting hard sediments,these methods exhibit no advantages.In this paper,a new corer which can exploit both hydrostatic energy and gravity energy for hard sediments coring is presented.The hydrostatic energy is provided by pressure differential between ambient seawater pressure and air pressure in an empty cavity.During sampling process,the corer penetrates into the sediment like a gravity corer and then automatically shifts to the percussion mode.The experiments in the laboratory indicate that the corer can complete 40 cycles in the sea with a cycle time of 2.8 seconds in percussion mode and impact the sample tube with the velocity of 0.2 m/s during each cycle.Besides,its adjustable falling velocity can make the corer achieve the maximum efficiency in coring different sediments. 相似文献
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A new, inexpensive and easy-to-handle box corer (47 × 47 × 114 cm3) is described. It is found to be extremely handy when operated from ships equipped with piston coring devices. The box corer uses the same piston core-head (～1000 kg) and the same trigger mechanism as used in piston coring. The whole operation is similar to that of piston coring. At three sites in the nodule-rich abyssal-hill province in the northwest Atlantic, the vertical distributions of the manganese nodules were obtained from the box cores. More than 75% of the nodules by weight is present in the top 10 cm of the sediment; 16–24% is present in the 10–20 cm interval and about 1% in the 20–30 cm interval. Very few nodules are found below 30 cm. 相似文献
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Residual undrained shear strength, su_res, is an important parameter for analyzing the response of structures buried within potentially unstable soil mass. A framework for estimating su_res of fine grained sediments from gravity corer penetration has been developed considering viscous drag during free fall of the corer through seawater and cohesive energy loss during sediment penetration. The procedure was used to estimate su_res using data from a submarine geotechnical investigation in western Canada. Comparison of the results with alternative estimates of su_res from miniature torvane tests on the gravity core samples and CPTs performed nearby reveals a reasonable agreement. 相似文献
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Abstract Sampling of submarine sediments by an improved piston corer and a bucket dredger has been carried out since 1973. The length of the core samples ranged from 0.9 m to 5.4 m. The recovery ratio ranged from 39.1 percent to 98.9 percent. The physical and engineering properties of 16 sediment cores and the physical properties of 125 dredged samples were determined, and variation of these properties was analyzed. Clayey silts and silty clays cover the floor of relatively wide bays and sea areas. Sands and sandy silts blanket the floor of channels that have swift currents, and are also found in the vicinity of estuaries. The piston core samples showed considerable sample disturbance, which should be estimated quantitatively in the future. 相似文献
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Chaitanya Vardhan 《Marine Georesources & Geotechnology》2013,31(4):305-316
Residual undrained shear strength, s u_res , is an important parameter for analyzing the response of structures buried within potentially unstable soil mass. A framework for estimating s u_res of fine grained sediments from gravity corer penetration has been developed considering viscous drag during free fall of the corer through seawater and cohesive energy loss during sediment penetration. The procedure was used to estimate s u_res using data from a submarine geotechnical investigation in western Canada. Comparison of the results with alternative estimates of s u_res from miniature torvane tests on the gravity core samples and CPTs performed nearby reveals a reasonable agreement. 相似文献