scholarly journals Field Monitoring of Deformations and Internal Forces of Surrounding Rocks and Lining Structures in the Construction of the Gangkou Double-Arched Tunnel—A Case Study

2017 ◽  
Vol 7 (2) ◽  
pp. 169 ◽  
Author(s):  
Qixiang Yan ◽  
Chuan Zhang ◽  
Gang Lin ◽  
Bo Wang
Keyword(s):  
Field Monitoring ◽  
Internal Forces

scholarly journals Field Monitoring of the Deformation and Internal Forces of the Surrounding Rock and Support Structures in the Construction of a Super-Span High-Speed Railway Tunnel—A Case Study

2020 ◽  
Vol 10 (15) ◽  
pp. 5182
Author(s):  
Daoping Liu ◽  
Dingli Zhang ◽  
Qian Fang ◽  
Zhenyu Sun ◽  
Jiwei Luo ◽  
...  
Keyword(s):  
Contact Pressure ◽  
High Speed ◽  
Field Monitoring ◽  
Surrounding Rock ◽  
Internal Stresses ◽  
Support Structures ◽  
Axial Forces ◽  
Geological Conditions ◽  
Internal Forces

A super-span tunnel that has the characteristics of a large excavation area, a small high-span ratio and a significant spatial effect exhibits a complex mechanical response during the excavation process. In this paper, taking the Badaling Great Wall station in Beijing, China as the engineering background, a case study of field monitoring a super-span tunnel has been presented. A typical monitoring section was selected in the super-span transition section of the tunnel and the deformation and forces of both the surrounding rock and the support structures were systematically monitored. The dynamic evolution and the spatial distribution characteristics of the monitoring data, including the internal displacement of the surrounding rock, the tunnel displacement, the contact pressure between the surrounding rock and the primary supports, the contact pressure between the primary and secondary supports, the axial forces in the bolts and cables, the internal forces in both the steel arches and the secondary supports and the internal stresses of the surrounding rock, were analyzed. The results of the monitoring and the analyses have shown that the deformation and the forces acting on both the surrounding rock and the tunnel’s lining are directly related to the construction procedures, the geological conditions and the locations in the super-span tunnel. According to the results, a few suggestions to improve the construction of the tunnel have been proposed.

scholarly journals Effect of Improvement and Application of Composite Prefabricated Vertical Drain Method in Marine Soft Ground: A Case Study

2019 ◽  
Vol 2019 ◽  
pp. 1-18 ◽  
Author(s):  
Jianqing Jiang ◽  
Reqiang Liu
Keyword(s):  
High Speed ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Ground Improvement ◽  
Field Monitoring ◽  
Hyperbolic Model ◽  
Soft Ground ◽  
Prefabricated Vertical Drains ◽  
Prefabricated Vertical Drain

One of the commonly used techniques to improve marine soft ground is the drainage consolidation method by plastic board drains (PBDs). But some complex marine soft ground will cause construction inconvenience of PBDs in certain areas of these sites, thus affecting the improvement effect. An alternative possible approach to overcoming these deficiencies may be the combination of PBDs and sand wick drains (SWDs) (i.e., composite prefabricated vertical drains (CPVDs)) as vertical drainage channels in the same site. In order to verify the suitability and performance of this method in marine soft ground improvement, a case study was performed based on the field monitoring and construction of the marine soft ground of an intercity express railway project in China. The construction procedure using the CPVD system, the field monitoring instrumentation scheme, and the design of fill surcharge level were described, and the field monitoring data were presented. The settlement characteristics, dissipation features of pore water pressure, and the horizontal movement pattern were assessed. In addition, predictions of ultimate settlement, postconstruction settlement, and consolidation degree were discussed by applying a modified hyperbolic model. The results show that the marine ground improved by the CPVD system is suitable for the construction of intercity express railway and high-speed railway. The improvement construction period of complex marine soft ground will be greatly shortened by the proposed parallel construction programme. This work will provide technical supports and application reference for the improvement of the similar marine soft ground.

Influence of soil conditions on the seismic behaviour of two cable-stayed bridges

1995 ◽  
Vol 22 (5) ◽  
pp. 1021-1040 ◽  
Author(s):  
Mohamed Elassaly ◽  
Amin Ghali ◽  
Mamdouh M. Elbadry
Keyword(s):  
Soil Structure ◽  
Seismic Waves ◽  
Seismic Analysis ◽  
Soil Structure Interaction ◽  
Soil Conditions ◽  
Seismic Behaviour ◽  
Internal Forces ◽  
Time Required ◽  
Cable Stayed Bridges

The results of a case study of the internal forces caused by earthquake in two examples of cable-stayed bridges are presented. A comparison is made between the behaviour of a model in which the structure is idealized without the foundation system and a model in which both the structure and the supporting foundation are idealized. The effects of varying the soil conditions on the seismic response are assessed. Also, the effects of out-of-phase support movements, caused by the lapse of time required for the seismic waves to travel from one support to the other, are considered. It is concluded that the effects of these parameters are significant and should not be ignored in the seismic analysis of cable-stayed bridges. Key words: bridges, cable-stayed, dynamic, earthquake, internal forces, seismic, soil–structure interaction.

scholarly journals Predicting thermal performance of a mass concrete foundation – A field monitoring case study

2019 ◽  
Vol 11 ◽  
pp. e00289 ◽  
Author(s):  
Yogiraj Sargam ◽  
Mahmoud Faytarouni ◽  
Kyle Riding ◽  
Kejin Wang ◽  
Charles Jahren ◽  
...  
Keyword(s):  
Thermal Performance ◽  
Field Monitoring ◽  
Mass Concrete ◽  
Concrete Foundation

scholarly journals Northwest McGregor field CO2 Huff ‘n’ Puff: A case study of the application of field monitoring and modeling techniques for CO2 prediction and accounting

2011 ◽  
Vol 4 ◽  
pp. 3386-3393 ◽  
Author(s):  
James A. Sorensen ◽  
Darren D. Schmidt ◽  
Damion J. Knudsen ◽  
Steven A. Smith ◽  
Charles D. Gorecki ◽  
...  
Keyword(s):  
Field Monitoring ◽  
Modeling Techniques

Dynamics of soil water content using field monitoring and AI: A case study of a vegetated soil in an urban environment in China

2020 ◽  
Vol 28 ◽  
pp. 100301 ◽  
Author(s):  
Ankit Garg ◽  
Vinay Kumar Gadi ◽  
Yi-Cheng Feng ◽  
Peng Lin ◽  
Wang Qinhua ◽  
...  
Keyword(s):  
Water Content ◽  
Urban Environment ◽  
Soil Water ◽  
Soil Water Content ◽  
Field Monitoring

scholarly journals ESTIMATING THE INTERNAL FORCES OF RAFT IN PILED RAFT FOUNDATION FOR NORMAL AND GROUNDWATER PUMPING CONDITIONS: A CASE STUDY SOC TRANG PROVINCE, VIETNAM

2021 ◽  
Vol 1 (42) ◽  
pp. 86-93
Author(s):  
Hiep Van Huynh ◽  
Tri Huu Huynh ◽  
Truyen Gia Ngo ◽  
Tuan Van Tran
Keyword(s):  
Shear Force ◽  
Soft Soil ◽  
Groundwater Pumping ◽  
Piled Raft ◽  
Piled Raft Foundation ◽  
Raft Foundation ◽  
Length Width ◽  
Internal Forces ◽  
Raft Foundations

Piled raft foundations are widely used in infrastructure built on soft soil to reduce the settlement and enhance bearing capacity. The raft can be used for basements and to share the load. In this paper, Poulos method, in which the raft was cut into many piled strips, was used as an analytical method. The study also used Plaxis2D and SAP 2000 to calculate internal forces for the raft in a piled raft foundation. A case of Vietcombank building with 10 floors and 1 basement, constructed on a soil profile in Soc Trang province, was studied. The piled raft with a 35m×19m×1m (length×width×thickness) raft and 28 piles were used for the analysis. Normaland groundwater pumping conditions were applied for the soil. The results showed that the maximum moment and shear force that occurred in the raft were affected when the groundwater pumping condition was applied to the model. The internal forces of the raft in the piled raft foundation for different conditions were captured,discussed, and presented in this paper.

scholarly journals Building Retrofitting System Based on Bamboo-Steel Hybrid Exoskeleton Structures: A Case Study

2021 ◽  
Vol 13 (11) ◽  
pp. 5984
Author(s):  
Vittoria F. Parrella ◽  
Luisa Molari
Keyword(s):  
Research Effort ◽  
Three Dimensional ◽  
Seismic Retrofitting ◽  
Low Carbon ◽  
Spatial Behaviour ◽  
Deformation Control ◽  
Internal Forces ◽  
Mechanical Performances ◽  
Bracing System

The building heritage of many seismic regions worldwide is largely substandard and seismically deficient and would require seismic retrofitting interventions. The use of natural materials with low embedded emissions could lead to a low carbon footprint of the retrofitting intervention. In this perspective, an innovative structural sustainable retrofitting system is proposed consisting of a hybrid steel–bamboo reticular bracing system. Through a preliminary two-dimensional analysis, the capabilities of the system are assessed by varying the size and the number of the culms and inserting engineered bamboo and steel rods. Considering the constraints posed by the openings, a structure that uses steel in the first inter-storey and bamboo in the others is proposed to obtain a significative improvement of mechanical performances. The spatial behaviour of this structure is studied through a three-dimensional numerical model. The seismic analyses show that the exoskeleton structure when conveniently anchored allows to achieve an effective displacement and deformation control on the primary structure, as well as a reduction of its internal forces. The results of the presented work may provide useful preliminary insights. Further research effort is needed to generalize the results to different seismic zones. The proposed seismic retrofitting system could be easily integrated with a thermal coat to also enhance energy saving.

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