The Experts below are selected from a list of 13134 Experts worldwide ranked by ideXlab platform
Wei-fong Lee - One of the best experts on this subject based on the ideXlab platform.
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Typical landslides and related mechanisms in Ali Mountain highway induced by typhoon Morakot: perspectives from Engineering Geology
Landslides, 2012Co-Authors: Chia-nan Liu, Jia-jyun Dong, Chi-jen Chen, Wei-fong LeeAbstract:Typhoon Morakot caused serious damage to southern Taiwan. Almost all major mountain highways located in the affected region suffered severe damage from landslides, rock falls, and debris flows. Among these highways, Ali Mountain Highway is one of the most severely affected. Ali Mountain Highway, i.e., T18 route, was constructed in the early 1980s. For the past 30 years of operation, it has suffered substantial damage from different natural hazards. The continued damage–rehabilitation cycle is implemented to maintain the serviceability of this highway. Ali Mountain Highway was seriously damaged by the strike of typhoon Morakot on August 8, 2009. Traffic through this highway was interrupted for over 3 months until temporary rehabilitation was completed. This paper provides a summary of the damage suffered along the Ali Mountain Highway and presents suggestions for mitigation strategies to minimize the likelihood of similar levels of damage during other extreme typhoons such as the typhoon Morakot. The manuscript summarizes extensive field surveys and aerial photo analysis carried out by the authors to investigate the mechanisms of typical slope failures along the Ali Mountain Highway. The Engineering Geology perspectives are emphasized in the analyses. Geological and hydrogeological features for the sites in this study were found to be the most influential factors dominating the failures. The fault-related weak zones and impermeable layers dominated the global stability of the slopes. In summary, geotechnical engineers should consider carefully the characteristics of geological structures for mitigation and rehabilitation of landslides. Extreme scenarios, such as typhoon Morakot, should also be considered.
Tong Changjiang - One of the best experts on this subject based on the ideXlab platform.
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a review of recent frozen soil Engineering in permafrost regions along qinghai tibet highway china
Permafrost and Periglacial Processes, 2002Co-Authors: Wu Qingbai, Liu Yongzhi, Zhang Jianming, Tong ChangjiangAbstract:The nature of frozen soil research along the Qinghai-Tibet Highway between 1993 and 2000 is systemically reviewed. Recent studies involve the Engineering Geology of frozen soil, the study of ground temperatures under the roadbed and the influence of the frozen soil environment, the Engineering classification of frozen soils, and the use of geographical information systems. This research will materially assist in the construction of the Qinghai-Tibet Railway. Copyright © 2002 John Wiley & Sons, Ltd.
Shaoling Wang - One of the best experts on this subject based on the ideXlab platform.
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zonation and assessment of frozen ground conditions for Engineering Geology along the china russia crude oil pipeline route from mo he to daqing northeastern china
Cold Regions Science and Technology, 2010Co-Authors: Xiaoli Chang, Jianming Zhang, Qihao Yu, Jilin Qi, Lanzhi Lu, Shaoling WangAbstract:Abstract The China–Russia Crude Oil Pipeline (CRCOP), 813 mm in diameter, is designed to transport 603,000 barrels of Siberian crude oil per day across 1030 km of frozen-ground. About 500 boreholes, with depths of 5 to 20 m, were drilled and cored for analyses, and the frozen-ground conditions were evaluated. After detailed surveys and analyses of the permafrost conditions along the pipeline route, a conventional burial construction mode at a nominal depth of 1.5 m was adopted. This paper discusses the principles and criteria for the zonation and assessment of the frozen-ground environments and conditions of Engineering Geology for the design, construction, and operation of the pipeline system based on an extensive and in-depth summary and analysis of the survey and exploration data. The characteristics of pipelining crude oil at ambient temperatures in the permafrost regions and the interactive processes between the pipeline and foundation soils were taken into account. Two zones of frozen-ground environment and conditions of Engineering Geology, i.e., seasonally-frozen-ground and permafrost, were defined on the basis of the regional distribution and differentiations in frozen-ground environments and conditions. Then, four subzones of the permafrost zone were classified according to the areal extent, taking into consideration the temperatures and thicknesses of permafrost, as well as changes in vegetation coverage. In the four subzones, 151 sections of Engineering Geology were categorized according to the ice/moisture contents of the permafrost, as well as the classes of frost-heaving and thaw-settlement potentials. These 151 sections are comprehensively summarized into four types for Engineering construction and operation: good, fair, poor, and very poor, for overall conditions of Engineering Geology. The zonation, assessment principles and criteria have been applied in the design of the pipeline. They have also been used as the scientific bases for the construction, environmental management, operation and maintenance/contingency plans.
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assessment of frozen ground conditions for Engineering Geology along the qinghai tibet highway and railway china
Engineering Geology, 2008Co-Authors: Huijun Jin, Zhi Wei, Shaoling WangAbstract:Abstract The Qinghai–Tibet Highway and Railway (the Corridor) across the Qinghai–Tibet Plateau traverses 670 km of permafrost and seasonally frozen-ground in the interior of the Plateau, which is sensitive to climatic and anthropogenic environmental changes. The frozen-ground conditions for Engineering Geology along the Corridor is complicated by the variability in the near-surface lithology, and the mosaic presence of warm permafrost and talik in a periglacial environment. Differential settlement is the major frost-effect problem encountered over permafrost areas. The traditional classification of frozen ground based on the areal distribution of permafrost is too generalized for Engineering purposes and a more refined classification is necessary for Engineering design and construction. A proposed classification of 51 zones, sub-zones, and sections of frozen ground has been widely adopted for the design and construction of foundations in the portion of the Corridor studied. The mean annual ground temperature (MAGT), near-surface soil types and moisture content, and active faults and topography are most commonly the primary controlling factors in this classification. However, other factors, such as local microreliefs, drainage conditions, and snow and vegetation covers also exert important influences on the features of frozen ground. About 60% of the total length of the Corridor studied possesses reasonably good frozen-ground conditions, which do not need special mitigative measures for frost hazards. However, other sections, such as warm and ice-rich or -saturated permafrost, particularly in the sections in wetlands, ground improvement measures such as elevated land bridges and passive or proactive cooling techniques need to be applied to ensure the long-term stability of thermally unstable, thick permafrost subsoils, and/or refill with non-frost-susceptible soils. Due to the long-history of the construction and management of the Corridor by various government departments, adverse impacts of construction and operation on the permafrost environment have been resulted. It is recommended that an integrated, executable plan for the routing of major construction projects within this transportation corridor be established and long-term monitoring networks installed for evaluating and mitigating the impact from anthropogenic and climatic changes in frozen-ground conditions.
Chia-nan Liu - One of the best experts on this subject based on the ideXlab platform.
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Typical landslides and related mechanisms in Ali Mountain highway induced by typhoon Morakot: perspectives from Engineering Geology
Landslides, 2012Co-Authors: Chia-nan Liu, Jia-jyun Dong, Chi-jen Chen, Wei-fong LeeAbstract:Typhoon Morakot caused serious damage to southern Taiwan. Almost all major mountain highways located in the affected region suffered severe damage from landslides, rock falls, and debris flows. Among these highways, Ali Mountain Highway is one of the most severely affected. Ali Mountain Highway, i.e., T18 route, was constructed in the early 1980s. For the past 30 years of operation, it has suffered substantial damage from different natural hazards. The continued damage–rehabilitation cycle is implemented to maintain the serviceability of this highway. Ali Mountain Highway was seriously damaged by the strike of typhoon Morakot on August 8, 2009. Traffic through this highway was interrupted for over 3 months until temporary rehabilitation was completed. This paper provides a summary of the damage suffered along the Ali Mountain Highway and presents suggestions for mitigation strategies to minimize the likelihood of similar levels of damage during other extreme typhoons such as the typhoon Morakot. The manuscript summarizes extensive field surveys and aerial photo analysis carried out by the authors to investigate the mechanisms of typical slope failures along the Ali Mountain Highway. The Engineering Geology perspectives are emphasized in the analyses. Geological and hydrogeological features for the sites in this study were found to be the most influential factors dominating the failures. The fault-related weak zones and impermeable layers dominated the global stability of the slopes. In summary, geotechnical engineers should consider carefully the characteristics of geological structures for mitigation and rehabilitation of landslides. Extreme scenarios, such as typhoon Morakot, should also be considered.
Wu Qingbai - One of the best experts on this subject based on the ideXlab platform.
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a review of recent frozen soil Engineering in permafrost regions along qinghai tibet highway china
Permafrost and Periglacial Processes, 2002Co-Authors: Wu Qingbai, Liu Yongzhi, Zhang Jianming, Tong ChangjiangAbstract:The nature of frozen soil research along the Qinghai-Tibet Highway between 1993 and 2000 is systemically reviewed. Recent studies involve the Engineering Geology of frozen soil, the study of ground temperatures under the roadbed and the influence of the frozen soil environment, the Engineering classification of frozen soils, and the use of geographical information systems. This research will materially assist in the construction of the Qinghai-Tibet Railway. Copyright © 2002 John Wiley & Sons, Ltd.