Results 21 to 30 of about 127 (102)
Applied Sciences, 2022 The engineering technology of undercrossing an airport flight area is relatively mature; however, the use of shield tunnels crossing the operating airport flight area in high liquidity sandy cobble stratum has rarely been reported.
Xuwei Zhao, Jia Li, Wei Liu, Wenge Qiu
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Advances in Materials Science and Engineering, 2020 There are severe challenges for slurry pressure balance tunnel boring machine (TBM) tunnelling in sandy cobble soil of Beijing, Chengdu, and Lanzhou in China. And the problems caused by tunnelling from silty clay to sandy cobble stratum are more serious.
Jian Cui +4 more
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Influence of stone content on face stability for tunnels in sandy cobble strata
Frontiers in Earth Science, 2023 As a result of the complex geological conditions of sand-cobble stratum, various types of problems may arise during construction of tunnels crossing sand-cobble stratum, the most prominent of which is the stability problem of the face.
Haifang Xue +9 more
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Frontiers in Earth Science, 2023 The pebble formation formed by weathered quartzite and granite is usually of high strength, strong permeability and poor self stability, which brings great difficulties to shield tunneling.
Meiyan Wang +5 more
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Model tests on face stability of shallow shield tunnels in sandy cobble strata
Yantu gongcheng xuebao, 2018 In order to study the response of shallow sandy cobble strata to shield excavation and face stability, an earth pressure balance shield model is designed to conduct the indoor model tests.
LI Wei-ping 1, LI Xing 2,3, XUE Ya-dong 2,3, ZHANG Sen 2,3, GE Jia-cheng 2,3
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Advances in Civil Engineering, 2020 Earth Pressure Balance (EPB) shield machines are considered to be the most efficient tunneling method for Metro tunnels due to their adaptability to a great variety of ground conditions, higher construction efficiency, and providing a safer working ...
Chaodong Wan, Zhiyi Jin
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Study on Landslide Mechanism and Treatment Technology in Tunnel of Sandy Cobble Stratum [PDF]
American Journal of Civil Engineering, 2017 The steady ability of sandy pebble stratum is poor, during the tunnel construction, landslides occur frequently. In order to clarify the mechanism of landslide in sand gravel tunnel and put forward effective treatment technology, the paper takes the Gongboxia tunnel, which located in Qinghai Province, as the engineering background.
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Advances in Civil Engineering, 2020 Silty sand is highly permeable and has a large internal friction angle. To ensure the stable and efficient construction of the Earth pressure balance (EPB) shield in silt stratum, it is necessary to reduce the disturbance to the stratum during tunneling ...
Yongjin Qian +3 more
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Yantu gongcheng xuebao, 2017 Good air tightness of filter membranes is necessary for opening excavation chamber under high pressure. To improve the value of air tightness, one should understand the pore structure and permeability change of filter membranes during chamber opening ...
ZHANG Ning 1, 2, ZHU Wei 1, 2, MIN Fan-lu 1, 2, XU Jing-bo 1, 2
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Journal of Quaternary Science, EarlyView.ABSTRACT Termites are landscape geo‐engineers whose nesting activities substantially modify the physical and chemical properties of soils. Fossilised termite nests commonly constitute the only identifiable evidence of ancient termite activity and represent valuable trace fossil archives for reconstructing past environments.
Miengah Abrahams +7 more
wiley +1 more source