scholarly journals Corrigendum to “Shield-driven induced ground surface and Ming Dynasty city wall settlement of Xi’an metro” [Tunnel. Undergr. Space Technol. 97 (2020) 103220]

2021 ◽  
Vol 115 ◽  
pp. 103954
Author(s):  
Jinxing Lai ◽  
Hui Zhou ◽  
Ke Wang ◽  
Junling Qiu ◽  
Lixin Wang ◽  
...  
Keyword(s):  
Ming Dynasty ◽  
Ground Surface ◽  
City Wall ◽  
Metro Tunnel

Shield-driven induced ground surface and Ming Dynasty city wall settlement of Xi’an metro

2020 ◽  
Vol 97 ◽  
pp. 103220 ◽  
Author(s):  
Jinxing Lai ◽  
Hui Zhou ◽  
Ke Wang ◽  
Junling Qiu ◽  
Lixin Wang ◽  
...  
Keyword(s):  
Ming Dynasty ◽  
Ground Surface ◽  
City Wall

scholarly journals Structural Monitoring of Metro Infrastructure during Shield Tunneling Construction

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
L. Ran ◽  
X. W. Ye ◽  
G. Ming ◽  
X. B. Dong
Keyword(s):  
Ground Surface ◽  
Structural Monitoring ◽  
Shield Tunnel ◽  
Shield Tunneling ◽  
Construction Monitoring ◽  
Infrastructure Monitoring ◽  
Ground Freezing ◽  
Artificial Ground Freezing ◽  
Metro Tunnel ◽  
General Architecture

Shield tunneling construction of metro infrastructure will continuously disturb the soils. The ground surface will be subjected to uplift or subsidence due to the deep excavation and the extrusion and consolidation of the soils. Implementation of the simultaneous monitoring with the shield tunnel construction will provide an effective reference in controlling the shield driving, while how to design and implement a safe, economic, and effective structural monitoring system for metro infrastructure is of great importance and necessity. This paper presents the general architecture of the shield construction of metro tunnels as well as the procedure of the artificial ground freezing construction of the metro-tunnel cross-passages. The design principles for metro infrastructure monitoring of the shield tunnel intervals in the Hangzhou Metro Line 1 are introduced. The detailed monitoring items and the specified alarming indices for construction monitoring of the shield tunneling are addressed, and the measured settlement variations at different monitoring locations are also presented.

Modeling of Road Network Capacity Research in Urban Central Area

2010 ◽  
Vol 40-41 ◽  
pp. 778-784 ◽  
Author(s):  
Hong Chen ◽  
Ji Biao Zhou ◽  
Yao Wu ◽  
Hui Fang Zhu ◽  
Yan Yong Guo
Keyword(s):  
Ming Dynasty ◽  
Traffic Management ◽  
Road Network ◽  
Central Area ◽  
Network Capacity ◽  
Model Parameters ◽  
City Wall ◽  
Novel Approach ◽  
Proposed Model ◽  
Level Model

The analysis and modeling of road network capacity provides a useful measure for urban planning and traffic management. Therefore, the primary purpose of this research is to construct a novel approach of modeling the capacity of road network, based on the theory of space and time consumption. Based on the analysis of model parameters, a bi-level model is proposed to determine and optimize the capacity of road network Meanwhile, this paper elaborates on solution algorithm for its upper and lower level model. Taking the area of Ming Dynasty City Wall in Xi’an, China into account as a case study, the effectiveness of this proposed model is verified. The results presents that the model’s validity is verified. The results show that the main road network capacity in city wall of Ming Dynasty is 721883 pcu/d.

Spanish Manila

2019 ◽  
pp. 49-61
Author(s):  
Evelyn Hu-DeHart
Keyword(s):  
Ming Dynasty ◽  
New Spain ◽  
The Philippines ◽  
Spanish Empire ◽  
Spanish Population ◽  
Asia Pacific ◽  
City Wall ◽  
Luxury Goods ◽  
The Everyday ◽  
Galleon Trade

This essay depicts the beginning of the Spanish Empire in the Asia-Pacific in the mid-sixteenth century (Ming dynasty), when Spaniard Miguel de Legazpi from Mexico in the Americas colonized the Philippines and established Manila as an extension of Spain’s American colony of New Spain. Sustaining this trans-Pacific relationship for 250 year was the Manila Galleon Trade between Acapulco, Mexico and Manila, trading American silver for Chinese silk, porcelain and other fine goods. The large community (twenty to thirty thousand) of Hokkien-speaking migrants from South Fujian (Minnan) which quickly arose and confined to ethnic neighbourhood outside the Manila city wall, became indispensable to the galleon trade by transporting from China all the luxury goods for the galleons, while resident artisans and labourers provided all the everyday consumer items, food, and services to the small Spanish population in Manila city. This first American “Chinatown” was the first large and permanent overseas Chinese community of Southeast Asia/Nanyang, which launched the worldwide Chinese diasporic movement that continues to this day, stretching all over the Americas, Europe and Africa.

scholarly journals Three-Dimensional Ground Settlement Induced by Metro Tunnel Excavation Considering the Influence of Group Piles

2016 ◽  
Vol 2016 ◽  
pp. 1-13
Author(s):  
Zou Jin-feng ◽  
Zhang Yan-jun ◽  
Dan Han-cheng
Keyword(s):  
Three Dimensional ◽  
Ground Surface ◽  
Soil Mass ◽  
Surface Settlement ◽  
Stochastic Medium ◽  
Ground Surface Settlement ◽  
Shear Displacement Method ◽  
Metro Tunnel ◽  
Group Piles ◽  
Prediction Approach

Considering the influence of group piles, a prediction model for three-dimensional ground surface settlement induced by circular metro tunnels excavation in incompressible rock masses is proposed based on the stochastic medium theory and the shear displacement method. The surface settlement caused by the metro tunnel opening is divided into two parts. One part is soil mass settlement caused by the metro tunnel opening and calculated by the stochastic medium theory. The other part is the settlement induced by the friction force between the group piles and the soil mass around the metro tunnel cross section and calculated by the shear displacement method. The three-dimensional prediction of the ground surface settlement is obtained by the linear superposition of the two parts. The validation of the proposed prediction approach is proved by comparing with the measured data and the numerical model of the double tunnels under thePuyuanoverpass where metro tunnels undercrossed group piles. The effects of buried depth, radial convergences, center distance of double tunnels, position and size of piles, and group piles are analyzed and discussed. The improved prediction approach can be applied to calculate the three-dimensional ground settlement, especially for the metro tunnels crossing through group piles.

scholarly journals Field Measurement and Numerical Simulation of Train-Induced Vibration from a Metro Tunnel in Soft Deposits

2021 ◽  
Vol 2021 ◽  
pp. 1-20
Author(s):  
Qiang Huang ◽  
Pan Li ◽  
Dongming Zhang ◽  
Hongwei Huang ◽  
Feng Zhang
Keyword(s):  
Numerical Simulation ◽  
High Frequency ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Ground Surface ◽  
Soil Layers ◽  
Acceleration Amplification ◽  
Metro Tunnel ◽  
Train Vibration ◽  
Train Induced Vibration

Train-induced vibration is increasingly attracting people’s concern nowadays. In the coastal areas, many metro tunnels are built in the soft deposits, so the train-induced vibration effect is more serious. Nevertheless, the existing research studies mainly focus on the dynamic responses in the tunnel or on the ground surface while vibration characteristics in the ground are seldom studied. In this paper, a comprehensive field measurement was performed by installing accelerometers in the tunnel and soil layers and on the ground surface to capture the response characteristics of the track-tunnel-ground system. Elastoplastic numerical simulation considering the soil-water coupling was conducted to reveal the responses of acceleration, dynamic displacement, and excess pore water pressure using FE code DBLEAVES. Measurement results indicate that high-frequency contents (>500 Hz) attenuate rapidly in the propagation process; the dominant frequency of the rail concentrates in the middle- and high-frequency bands, about 25–400 Hz and 1000–1500 Hz, while the frequencies of the track bed, soil layers, and ground surface drop to below 400, 200, and 100 Hz, respectively. The vertical ground acceleration decreases like an arc in the transverse direction while there is transverse acceleration amplification phenomenon at a distance from the upper haunch and lower haunch of the tunnel. Overall, the area affected by train vibration in the soft deposits is about 30 m away from the metro tunnel. Numerical simulation based on soil-water coupled analysis is feasible to model the vibration characteristics in the soft deposits and confirms that there is acceleration amplification in the ground. Moreover, numerical results indicate that excess pore water pressure can be accumulated during each train vibration, so the train-induced settlement will be a potential problem in the long term for the metro tunnel.

On the Investigation of Protection Technique for the Old City Wall of Ming Dynasty-Xian 4th Tube Line Construction

2013 ◽  
Vol 353-356 ◽  
pp. 2913-2918
Author(s):  
Jing Zhu Li ◽  
Jian Xu
Keyword(s):  
Ming Dynasty ◽  
Surface Deformation ◽  
Soil Surface ◽  
Deformation Model ◽  
Railway Transportation ◽  
City Wall ◽  
Protection Scheme ◽  
Line Construction ◽  
Pass Through ◽  
The City

In this paper Xian 4th tube line is selected as the research target, the earth surface deformation is evaluated based on the soil surface deformation model, and the influence of construction of Xian 4th tube line on the city wall of Ming dynasty is investigated, the protection scheme and rules are proposed when the tube pass through the city wall, the influence on the wall is evaluated during the tube operation and the protection technique is also proposed, which will reduce the influence from the construction and operation of tube, and the friendly development between the railway transportation and environment is realized.

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