探地雷达技术在探测边坡破碎带中的应用

探地雷达是利用高频电磁脉冲的反射对地下目的体及地质现象进行探测的一种高效浅层勘探方法，随着电子技术和计算机技术的不断发展，该技术的应用领域不断扩大。本文从探地雷达的基本原理出发，结合在浙江省金丽温高速公路某段边坡探测的应用实例，详细分析了破碎带的雷达图像特征。通过理论与实践的相互结合，证实利用探地雷达进行边坡破碎带探测是科学可行的，拓宽了该技术在岩土工程勘察中的应用，进一步表明该技术具有较强的推广潜力。     

Persistent organochlorine residues in sediments from the Black Sea

The extent of contamination of the Black Sea by selected organochlorine compounds has been assessed through the analysis of surficial sediments taken from throughout the region. Concentrations of HCHs at sites influenced by the Danube delta are among the highest recorded on a global basis (up to 40 ng g(-1) dry wt). The ratio between the alpha- and gamma-isomers was relatively low indicating contamination through the use of lindane. Concentrations of DDTs (0.06-72 ng g(-1) dry wt) and PCBs (0.06-72 ng g(-1) dry wt) were not especially high in comparison to levels reported from throughout the world. The DDE/DDT ratio was, however, low indicating fresh inputs and hence current usage of DDT within the Black Sea region.     

Discovery of the Jiawengmen Stromatolite Assemblage in the Southern Belt of Eastern Kunlun, NW China and Its Significance

1 Introduction The stromatolites of the Jiawengmen area in the southern belt of the Eastern Kunlun orogen were initially interpreted as vortex structures by the Regional Geological Survey Team, Qinghai Bureau of Geology and Mineral Resources in 1973; these samples were then identified as algal fossils of Sinian age by the Nanjing Institute of Geology and Paleontology (Qinghai Bureau of Geology and Mineral Resources, 1973). In 1994, Chen and Luo (1998) discovered some stromatolites, i…     

富钴铁锰结壳的控矿要素和成矿过程:以西太平洋为例

富钴铁锰结壳(简称富钴结壳)是产出在海山、岛屿斜坡及海底高地上的一种潜在新型矿产资源,由铁锰氧化物和氢氧化物组成,富含Co、Ni、Zn、Pb、Ce、Pt、REE等金属元素,其中Co的平均含量较陆地原生钴矿高几十倍.     

咸海演化的关键问题及其对经济、社会和生态价值的重要启示

本文回顾了Aral Sea(咸海)海平面变化的最新认识,以供社会和经济项目决策者使用。我们提出了咸海生态标准的新认识:由于1960年之前当时的人类活动已经引起了湖泊萎缩,咸海在1960年之前是小到中型湖泊,而不是大型湖泊。对咸海认识的改变可能会使许多基于极端情景的昂贵计划变得更加现实。同时,基于地质、考古、历史和水文研究中所获得的多重数据的综合分析,本次结果认为咸海在过去的2万年内经历了多次突然的海侵和海退。然而,除了现代的原因外,引起这些变化的原因的认识仍然不完整,需要进行专门的调查研究。在这篇论文中,我们针对水位变化、气候变化与咸海盆地来自锡尔河和阿姆河供水变化相结合的研究方法进行了讨论。     

Modelling Solitary Waves and Its Impact on Coastal Houses with SPH Method

The interaction between solid structures and free-surface flows is investigated in this study. A Smoothed Particle Hydrodynamics (SPH) model is used in the investigation and is verified against analytical solutions and experimental observations. The main aim is to examine the effectiveness of a tsunami-resistant house design by predicting the wave loads on it. To achieve this, the solitary wave generation and run-up are studied first. The solitary wave is generated by allowing a heavily weighted block to penetrate into a tank of water at one end, and the near-shore seabed is modelled by an inclined section with a constant slope. Then, the SPH model is applied to simulate the three-dimensional flows around different types of houses under the action of a solitary wave. It has been found that the tsunami-resistant house design reduces the impact force by a factor of three.     

Application of the Engineering-Geological Conditions in Land-Use Plans in the Petrvald Region(Czech Republic)

The objective of this paper is to demonstrate necessity to inform relevant parties about engineering-geological conditions for various practical purposes,especially including appropriate land-use planning.However,the relationship between relevant geological information and the geological environment is vital for foundation engineering purposes,especially where demanding structures are involved.This information is most conveniently structured when accumulated information concerning engineering-geological zones is utilized.This necessarily includes knowledge of rock workability and also of the pre-Quaternary bedrock,and these characteristics were then related to the current built-up area and future development according to the land-use plans in a case study are from the Petrvald Region(Czech Republic).The geological environment of area has been severely influenced by anthropogenic effects of deep black coal mining.Results of this research showed that future development should be founded on spoil banks,dumps,and settling basins. According to the land-use plan,this zone occupies 44.9%of the area of interest,and its materials predominantly emanate from mining in the Ostrava-Karvina Coal District.For future foundation structures planned there,it is imperative to consult detailed engineering-geological study.However, attention to and reliance on this necessity is not reflected in the existing land-use plan.     

太古宙脉金矿床:地壳规模热液系统的产物

最近有关太古宙脉金矿床的成因争论集中在矿液来源和它们的抽送系统的规模上。产在以绿片岩相至低角闪岩相绿岩为容矿岩的较大型中温热液矿床,已引起人们十分关注,而对产在较低或较高变质程度背景中的金矿床却很少注意。但是,现在很明显的是,在西澳伊尔岗地块,大多数脉金矿床代表了一种“单一金(“gold-only”)矿床的相关(Coherent)成因群(genetic group),这一成因群是在大于15km 地壳剖面的各种构造格局中形成的,温-压条件估计从250℃、10~8Pa(次绿片岩相)到700℃、5×10~8Pa(低麻粒岩相)。依照矿化的构造型式和伴生围岩蚀变,它们代表着一种过渡群。有金矿床出现     

黄土的力学性质与工程地质问题现状

据统计,目前全世界几乎每天都有一篇关于黄土工程力学性质的新文献问世。黄土具有一些特殊的性质:干燥时坚硬,遇水则变弱。这种性状常引起大规模沉降及湿陷。黄土的渗透系数小(0.5—1.5m/d),水分损失少,因而黄土上的建筑工地往往具有地下水位高的特点,引起地基浸湿。黄土区常有的“假喀斯特”现象,在地震时会引起泥石流和大规模滑坡。