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Risks analysis of large diameter slurry shield tunneling in urban area

Underground Space 2023年第6期13卷 281-300页

作者： Yi Zeng Pierre Guy Atangana Njock Wang Xiong Xiao-Long Zhang Shui-Long Shen Shanghai Tunnel Engineering&Rail Transit Design and Research Institute Shanghai 200235China Department of Civil and Environmental Engineering College of EngineeringShantou UniversityShantouGuangdong 515063China MOE Key Laboratory of Intelligence Manufacturing Technology Department of Civil and Environmental EngineeringCollege of EngineeringShantou UniversityShantouGuangdong 515063China

The construction of super-large tunnels generates various safety risks that can hamper the tunneling process and cause severe damages if not properly *** paper presents a case study on the identification and management of geological and environmental risks during the construction of the largest(a diameter of 15.8 m)slurry shield tunnel in *** ground conditions and settlement control were identified among the most challenging owing to a large area of mixed ground conditions,11 fault zones and tunneling under residential areas and the city’s Metro Lines 1 and *** response to the severity of these risks and challenges,novel monitoring systems,ground treatment,and safety management technologies were successfully implemented throughout the tunneling ***,a technical framework was proposed in this study to serve as a risk management guidance for analogous tunneling operations.

关键词： Large diameter Risks Shield tunneling fault zones Geohazard mitigation

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Geological Controls and Prospectivity Mapping for Manganese Ore Deposits Using Predictive Modeling Comparison:An Integration of Outcrop and Remote Sensing Data,Sinai Microplate,Egypt

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Journal of Earth Science 2023年第2期34卷 588-608页

作者： Sara Zamzam Geology Department Faculty of ScienceZagazig UniversityZagazig 44519Egypt

One of the most controversial minerals in their origin and occurrence around the world is manganese *** Abu Zenima area is rated one of the most economically important places where manganese ore deposits(Mn ODs)are located in the southwest Sinai microplate,*** deposits are confined with the Um Bogma Formation(UBF)and the reserves of this region are relatively *** this study,optical and radar data are used in a new challenge as an attempt to reach the closest controls and setting of Mn ***,Frequency Ratio(FR)and Logistic Regression(LogR)predictive models are applied to integrate different geospatial thematic maps,to predict new potential resource zones for increasing the ranges of mining ***8 OLI,Sentinel-2A Multi Spectral Instrument and Radar(Sentinel-1B)data are combined for mapping Mn ODs locations and their relationship with geological structures and the surrounding *** ratio,Principal and Independent Component Analysis techniques and four classification algorithms were implemented to the optical’VNIR and SWIR ***,the interferometric processing steps for Sentinel-1 data were made for understanding the tectonic features in the *** FR and LogR models are validated during fieldwork with known Mn ODs *** indicate that processed images are capable of differentiation of UBF which broadly distributed in the central and southern parts of the *** ODs possibly formed by thermal events that attributed to paleo-volcanic events before the rift *** high accuracy of LogR model(0.902)suggests that high Mn ODs potential zones are identified within the intersected fault zones near granitic *** integration is recommended for discriminating hydrothermally Mn ODs in other arid geographic regions.

关键词： manganese deposits Abu Zenima Landsat8 oli sentinel data fault zones predictive modeling remote sensing

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The Polar Urals Ophiolites

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Acta Geologica Sinica(English Edition) 2015年第A2期89卷 85-86页

作者： Shmelev V.R. Institute of Geology and Geochemistry

There are few older orogens in the world, like the Caledonides, where it is possible to demonstrate many hundreds of kilometers of translation of allochthons, comparable to those in the Himalaya-Tibet mountain belt. I... 详细信息

关键词： Ophiolites Plate tectonics Geology fault zones Peridotite

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Analytical Results of Cam Ranh-Tuy Phong fault Characteristics and Its Relation to Mud Eruption in Nam Trung Bo Area, Viet Nam

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Journal of Geological Resource and Engineering 2016年第7期4卷 335-344页

作者： Truong Thanh Phi Van Thom Bui Dang Manh Nguyen Hanoi University of Natural Resources and Environment Hanoi Vietnam Institute of Geology Viet Nam Academy of Science and Technology Hanoi Vietnam

By analyzing the satellite images, topology map, geology map, geomorphology map, and field survey data, this study has determined the Cam Ranh-Tuy Phong fault in the South Central area, Viet Nam has NE-SW orientation and inclines to SE with high slope angle of 70-80°. During the Pliocene-Quaternary period, the Cam Ranh-Tuy Phong fault is left-lateral movement with the extension mechanisms, which formed the graben have an NE-SW orientation, deposited by Quaternary sediment. The fracture systems and fault are the channels for the mineral water and hot water to move up from the deep zone in the area of Cam Thinh Dong, Ha Nhi, Vinh Hao, Nha Me, Tuy Thinh..., and also to be the channels for the mud material, clay and underground water to move from below zone to the surface to form high mud mounds. The analytical results of clay mud have identified clay mineral composition to be main montmorilonit, illite, kaolinite, calcite, chlorite. The occurrence of montmorilonit minerals in this study area is characterized by the alkali-rich environment. The chemical composition of calcite is determined forming in the environment of with pH 〉 9, characterized by the add climates. Besides, other analytical results of clay mud also identified some minerals, such as： ankerite （Fe, Mg）CO3, calcite and some accessory minerals such as： fluorite, lepidocrokit with the participation hydrothermal process.

关键词： fault zones mud eruption tectonic activities mineral water hot water.

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The fault Systerm of the North Section of Liaodong Salient,Constraints from Seismic Data and Physical Modeling Experiment

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Acta Geologica Sinica(English Edition) 2015年第A1期89卷 217-217页

作者： ZHANG Jing WU Zhingping LI Wei REN Jian China University of Petroleum

The north section of Liaodong Salient located in the northern part of the east salient in Liaodong bay depression, Bohai Bay Basin, east China. The east and west boundary faults are all branches of the Tan-Lu fault Zone. Now it has proved oil-containing structure JZ27-6, JZ23,etc. but it is still in low degree in geological research.

关键词： fault zones GEOLOGICAL research LIAODONG Peninsula (China)

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