Results 81 to 90 of about 127 (102)
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Evolution of temperature field and frozen wall in sandy cobble stratum using LN2 freezing method
Applied Thermal Engineering, 2021Abstract There is high risk of water inrush and ground collapse when tunneling in sandy cobble stratum in confined aquifer. Among various methods, artificial freezing method is an effective method to pre-reinforce the soft ground to prevent water inrush and ground collapse during tunneling.
Yongshui Kang +2 more
exaly +2 more sources
Transportation Geotechnics, 2021
Abstract The excavation disturbed zone plays an important role in the evaluation of tunnel stability. The identification of the excavation disturbed zone is perceived as a main concern. Taking the material meso-structure into account, this paper investigates the construction mechanical behavior in heterogeneous sand cobble stratum and aims to ...
Dechun Lu, Jilin Qi
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Abstract The excavation disturbed zone plays an important role in the evaluation of tunnel stability. The identification of the excavation disturbed zone is perceived as a main concern. Taking the material meso-structure into account, this paper investigates the construction mechanical behavior in heterogeneous sand cobble stratum and aims to ...
Dechun Lu, Jilin Qi
exaly +2 more sources
KSCE Journal of Civil Engineering, 2021 As a long-term urban transportation infrastructure, the stability of metro construction is very important. With the continuous expansion of urban metro network, metro adjacent construction is more and more frequently encountered. In this paper, taking the double-line adjacent construction problems encountered during excavation of Beijing New Airport ...
Xianjie Hao, Zhuowen Sun, Yixin Zhao
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Model Testing on Failure Mechanism of Tunnel Face in Sandy Cobble Stratum
Arabian Journal for Science and Engineering, 2020One of the universal problems in shield tunneling is face collapse caused by the sudden change of the soil in front of the tunnel face in weak sandy pebble stratum. In order to control the sudden change of the soil, the model test method is used to study the stability of the tunnel face in the sandy pebble stratum.
Junwei Zhang
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A multi-scale analysis method for the simulation of tunnel excavation in sandy cobble stratum
Tunnelling and Underground Space Technology, 2019Abstract Sandy cobble stratum is a kind of heterogeneous geological body. A further study on the safety of wall rocks and underground structure demands developing suitable analysis method to simulate tunnel excavation in such a formation. Macro-scale simulations assume the sandy cobble soil to be homogeneous in numerical models.
Dechun Lu
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Structural Optimization of Shield Machine Cutterhead Applied in Sandy Cobble Stratum
Applied Mechanics and Materials, 2014With the aim of probing the optimal cutterhead structure for sandy cobble stratum in Beijing metro, four typical cutterhead structure are presented. The load on the cutterhead is calculated. The finite element models of cutterhead with thickness of 350 mm, 400 mm and 500 mm for each structure style are established respectively.
Tian Min Guan, Wu Li, Guan Tian Min
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Arabian Journal for Science and Engineering, 2021
The ground subsidence accident caused by the instability of shield tunnel face has been a major problem that puzzles urban subway construction in weak rock. Maintaining the stability of tunnel face is the key to ensure the safety of shield construction and reduce the environmental impact.
Zhang Junwei, Junwei Zhang
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The ground subsidence accident caused by the instability of shield tunnel face has been a major problem that puzzles urban subway construction in weak rock. Maintaining the stability of tunnel face is the key to ensure the safety of shield construction and reduce the environmental impact.
Zhang Junwei, Junwei Zhang
exaly +2 more sources
Study on Mechanical Characteristics of Tunnel Support System in Sandy Cobble Stratum [PDF]
American Journal of Civil Engineering, 2017 Because the sand gravel stratum with loose structure, good gradation, easy disturbance, poor stability, deformation and other characteristics of long duration, large deformation and collapse failure phenomenon is extremely easy to cause in the tunnel construction, leading to a primary support structure for strong deformation or even destruction ...
exaly +2 more sources