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191.
192.
A classification system for the assessment of slope stability of terrains along highway routes in Jordan 总被引:2,自引:0,他引:2
The establishment of comprehensive development plans, in general, and the proper selection of highway routes, in particular,
require an assessment of landslides or instability hazards in the project sites. The frequent landslides that occurred along
the routes of major highways in Jordan, and particularly along the Amman-Na'ur-Dead Sea highway and Irbid-Jerash-Amman highway,
have substantially increased the cost of construction and caused a considerable delay in the completion of work. The study
of many landslides that occurred in the last 25 years along the highway routes and in the sites of some major civil engineering
projects in Jordan has led to the recognition of major factors that affect the stability of slopes, and thus the safety and
economics of these projects. The geological formation, structural features, topographic characteristics, geometry, and climatic
conditions were adopted as the basis for the classification of terrains in terms of their stability. Each factor has been
assigned a rating to indicate its relative contribution to the overall stability according to engineering judgment and past
experience. The areas have been classified into 5 groups according to their total stability rate. The simplicity, comprehensiveness,
and accuracy are the main characteristics of the proposed classification. Its significance stems from its helpfulness as a
guide to the geotechnical and highway engineers in assessing the overall stability of the alternative routes of proposed highway
projects.
Received: 3 December 1996 · Accepted: 29 April 1997 相似文献
193.
元古宙蛇绿岩研究现状及其板块构造意义 总被引:1,自引:0,他引:1
在回顾元古宙蛇绿岩研究简史的基础上,对元古宙蛇绍岩的时空分布特征,岩石组合类型,变质作用程度,大地构造背景及源区地球化学制约等进行了系统总结,并就元古宙蛇绿岩的板块构造意义作了探讨。 相似文献
194.
Paleoclimatic significance of grain size of loess-palaeosol deposit in Chinese Loess Plateau 总被引:9,自引:2,他引:7
Particle size analysis for samples from three last glacial cycle loess-palaeosol profiles along a northwestsoutheast transection
on the Chinese Loess Plateau has been carried out. The paleoclimatic significance of grain size indices has been obtained
by analyzing the fraction content variations and their comparisons with global ice volume and solar radiation variations.
The results show that (i) paleoclimatic significance of the grain size indices of loess-palaeosol deposit is different with
grain size fraction content and sampling points in Chinese Loess Plateau; (ii) the sub-coarse grain fraction is a good proxy
index of East Asia winter monsoon strength and therefore can be used to detect the global climate changes; (iii) the content
of sub-fine and fine grain fractions is influenced by both the input of sub-coarse grain fraction and pedogenesis; (iv) the
sub-coarse fraction exhibits a negative relationship with the sub-fine and fine fractlon.
Project supported by the 9.5 major project of Chinese Academy of Sciences and the open grant of the State Key Laboratory of
Loess and Quaternary Geology, Chinese Academy of Sciences. 相似文献
195.
Reform of Carbonate Rock Subsurface by Crustose Lichens and Its Environmental Significance 总被引:5,自引:0,他引:5
CAO Jianhua WANG FuxingInstitute of Karst Geology Chinese Academy of Geological Sciences Guilin Guanxi Xiao Pinfang Liu Xinzhu 《《地质学报》英文版》1998,72(1):94-99
Crustose lichens are distributed extensively in karst areas in Southern China. They can be found on the surface of carbonate rocks. Through biophysical and biochemical processes, crustose lichens reform the subsurface of carbonate rocks and in the meanwhile change their physical and chemical properties: (1) the mechanical strength decreases by 17.04° on average (up to 33.2° ); (2) the chemical solution surface area increases from 28.26% to 75.36% (lichen microholes considered only); and (3) the water-holding capacity is greatly improved. Comparative field experiments between biokarst samples underneath crustose lichens and fresh rock samples with the same composition and texture show that the corrosional rate of carbonate rocks of the former is 1.264-1.643 times higher than that of the latter. Crustose lichens are considered as an activator of the surface corrosion of carbonate rocks. 相似文献
196.
地质环境是自然环境的一部分,是人类赖以生存的客观地质实体。地质环境的开发利用,保护与改造,在现实生活中往往是比较突出的矛盾。著名的佛教胜地,风景旅游区和重要的多金属矿产基地的南京栖霞山,在这方面就存在许多问题。对之应采取护岸工程,治水,治支,治坡,保护和改造地质环境,限制地下水的开采量,保持地下水资源的供需平衡等措施,是根治栖霞山地质环境问题的基本对策。 相似文献
197.
腾格里沙漠地区钾芒硝的首次发现及地质意义 总被引:4,自引:0,他引:4
腾格里沙漠地区钾芒硝的首次发现及地质意义@刘振敏@崔天秀@韦钊@高月珍¥化工部化学矿产地质研究院钾芒硝,首次发现,地质意义,腾格里沙漠腾格里沙漠地区钾芒硝的首次发现及地质意义刘振敏崔天秀韦钊高月珍(化工部化学矿产地质研究院,河北涿州072754)关键词钾... 相似文献
198.
根据两次资源评价结果的分析和对比,认为值得对古生界进行大规模油气勘探。分析了中国海相油气勘探滞后的原因是地史发展的顺序为先海后陆和海相沉积深度比陆相的大。归纳阐述了适用于海相沉积与陆相沉积的10条基本石油地质认识,指出了我国海相沉积深度大、年代老、生油争议多、气比油多、遭破坏多等特点,建议开展区域地质、碳酸盐岩生油、古隆起带、逆掩断层带、盐下油气、碳酸盐岩储集性、油藏破坏与保存的关系、新技术与新方法等8个方面的研究。 相似文献
199.
赣西五宝山钴矿床地质特征及成因探讨 总被引:13,自引:2,他引:11
五宝山钴矿床是近年普查中发现的一个中型钴矿床,属层控热液叠加型钴矿床。钴矿化产于上三叠统安源组砂砾岩层中,受NE向逆断层控制,矿体呈似层状或透镜状产出,随褶曲变化而起伏,钴矿体品位在0.024%~1.15%范围变化,平均含钴0.4028%。矿石自然类型为砂砾岩型铅锌矿石、铅锌钴矿石和钴矿石,矿石可选性良好。钴矿物主要有辉钴矿和钴毒砂。 相似文献
200.
反射系数(K)法在激电测深找矿中的应用 总被引:4,自引:0,他引:4
反射系数(K)法是一种电测深ρs资料的解释手段和处理方法。从湖南某砂岩铜矿利用激电测深确定红层中的含矿层,某铅锌矿利用激电测深探测两条含矿破碎带的实例,说明反射系数(K)法在对激电测深ρs资料解释的基础上,结合激电异常的特点,能有效地确定不同的地质构造,达到间接找矿的目的。 相似文献