Centrifuge tests on installation of suction anchors in soft clay

Three centrifuge model tests were performed in normally consolidated Speswhite Kaolin to study the penetration of suction anchors in soft clay. The suction anchors could be penetrated by means of underpressure to a depth of about 12.4 to a little more than 14.5 times the diameter. When the anchors were penetrated by underpressure, all clay displaced by the skirt moved into the anchor. At a penetration depth of about half the maximum penetration depth, the volume of the soil heave inside the anchor actually increased more than the volume of the displaced clay. When a material coefficient of 1.5 against plug failure was mobilized, more than the clay displaced by the skirts had accumulated inside the anchor. The penetration resistance increased by 42 and 26% during rest periods of 4.5 and 0.8 days prototype time, respectively. Some uncertainty in the shear strength of the clay beds gave some uncertainty with respect to the interpretation, but the observed behaviour generally confirmed the theoretical analyses.     

吉兰泰盐湖区域地质特征及其形成演化的遥感解译

采用吉兰泰盐湖地区TM数据进行标准假彩色图像处理 ,对研究区构造、地貌、水系分布等地质特征进行解译和分析 ,探讨了吉兰泰盐湖的形成演化过程和盐湖形成的水体来源。结果表明 ,研究区贺兰山隆起带、吉兰泰沉降带、巴音乌拉山隆起带所组成的北北东向右行多字型斜列的基本构造格局 ,不仅控制着吉兰泰盐湖古湖盆的演化 ,而且控制着吉兰泰盐湖形成的水体来源     

北京市遥感矿产地质构造解译与异常提取初步分析

本文以遥感构造理论为主导,阐明全市地质构造的基本特征。通过对ETM、TM资料定向滤波、主成分分析、线性增强和假彩色合成处理后,采用目视综合解译,获得一系列遥感图件,从线、环、色、带、块及遥感异常等方面反映了遥感地质成果。     

矿业开发活动的高分辨率遥感影像解译标志

以IKONOS 1m分辨率遥感影像为例,对矿业开发活动中按露天开采面、开采硐口、固体废弃物、尾矿库、中转场地、矿山建筑等进行分类研究,总结以上六类地物在高分辨率遥感影像上的解译标志。     

冰冻圈变化的可预测性、不可逆性和深度不确定性

IPCC第六次评估报告(AR6)第一工作组报告对气候系统各要素的可预测性(predictability)、不可逆性(irreversibility)和深度不确定性(deep uncertainty)给出了新认识.文中基于此对全球冰冻圈变化的上述三方面加以总结和归纳.总体来看,无论何种排放情景,半球和全球尺度上冰冻圈各要...     

内蒙古自治区锡林浩特市毛登锡锌矿地质特征

毛登锡锌矿位于内蒙古兴安岭晚古生代中生代铜、铅、锌、金、银、锡、铬（钼）成矿区大兴安岭中南部成矿带,哲斯乌兰浩特成矿亚带之黄岗梁甘珠尔庙突泉乌兰浩特铁、锡、钨多金属成矿带上,区域成矿地质条件好。在对该矿床开展详查工作的基础上,分析了矿床地质特征,指出矿区发育有利于多金属成矿的地层、构造和岩浆岩条件,分析了矿床成因,提出了找矿标志,对该区远景找矿具有一定的指导意义。     

对国标(GB/T 20257.1-2007)地形图图式的认识

简要介绍国家基本比例尺地图图式第一部分(GB/T 20257.1-2007)与(GB/T7929-1995)在地形图要素内容分类、要素符号等方面关系以及笔者的认识、建议。     

新疆伊宁县塔乌尔别克金矿地质特征及找矿标志

塔乌尔别克金矿赋存于下石炭统大哈拉军山组一套酸性—中酸性火山碎屑岩—熔岩建造中,矿体产出严格受断裂构造控制。矿体呈脉状、透镜状,倾角50°~70°。矿石以蚀变破碎安山岩型、斑岩型、含金隐爆角砾岩型和含金石英（方解石）脉型为主。成因与古火山机构、次火山岩有密切关系。一定的层位、断裂交会处、隐爆角砾岩及典型的蚀变为主要找矿标志。     

西藏矿产资源潜力评价遥感专题中典型问题初探

西藏矿产资源潜力评价项目遥感专题通过提取各1:25万标准图幅及全区遥感异常信息和编制遥感推断地质构造图,为项目地质背景编图、成矿规律研究和矿产资源预测提供了基础性图件.因西藏全区面积广阔、涉及的遥感图像时相各异、图像处理软件及方法流程复杂,加之技术人员专业背景和经验等差异,在遥感专题实施中出现了4个典型问题:①对基准面...     

Dual sensor streamer technology used in Sleipner CO2 injection monitoring

CO₂ has been injected into the saline aquifer Utsira Fm at the Sleipner field since 1996. In order to monitor the movement of the CO₂ in the sub‐surface, the seventh seismic monitor survey was acquired in 2010, with dual sensor streamers which enabled optimal towing depths compared to previous surveys. We here report both on the time‐lapse observations and on the improved resolution compared to the conventional streamer surveys. This study shows that the CO₂ is still contained in the subsurface, with no indications of leakage. The time‐lapse repeatability of the dual sensor streamer data versus conventional data is sufficient for interpreting the time‐lapse effects of the CO₂ at Sleipner, and the higher resolution of the 2010 survey has enabled a refinement of the interpretation of nine CO₂ saturated layers with improved thickness estimates of the layers. In particular we have estimated the thickness of the uppermost CO₂ layer based on an analysis of amplitude strength together with time‐separation of top and base of this layer and found the maximum thickness to be 11 m. This refined interpretation gives a good base line for future time‐lapse surveys at the Sleipner CO₂ injection site.