scholarly journals Analysing the Effect of Tunnel Construction on Existing Structure by Using Analytical and Numerical Method

2021 ◽  
Vol 9 (VII) ◽  
pp. 3961-3971
Author(s):  
NInad Choudhary
Keyword(s):  
Numerical Method ◽  
Urban Areas ◽  
Suitable Method ◽  
Tunnel Construction ◽  
Ground Settlement ◽  
Underground Construction ◽  
Existing Structures ◽  
Geological Conditions ◽  
Existing Structure

Underground construction in urban areas is a challenging work to carry out and includes a lot of factors to be considered. In varying geological conditions, it becomes very difficult as there are various faults and fracture, so it requires a proper investigation to be done before starting of the project. The aim of this report is to determine the effects of tunneling on existing structures and tunnel surrounding due to tunnelling work, like crack in structure, vibrations caused to the above structure and ground settlement. To identify the movements caused and giving a solution by using the RS2 software and deciding the best suitable method for Construction of tunnel.

To Analyze Different Excavation Pattern in NATM Construction

2021 ◽  
Vol 9 (VII) ◽  
pp. 3919-3931
Author(s):  
Vibhuti Goyal
Keyword(s):  
Urban Area ◽  
Urban Areas ◽  
Underground Structure ◽  
Underground Construction ◽  
Metro Station ◽  
Unique Challenge ◽  
Tunneling Method ◽  
Geological Conditions ◽  
The World ◽  
Tunnel Design

Underground construction is preferable due to lack of space availability on surface in urban areas, so the underground construction is increasing throughout the world for various reasons. Tunneling in urban area is a unique challenge, these challenge can be addressed with suitable tunnel design. New Austrian Tunneling Method (NATM) has become the method of choice for tunneling in urban areas to construct underground structure such as metro station, rail crossovers, multi-track metro lines. The aim of this report is to analyze different excavation pattern such as heading, benching and invert in NATM construction in varying geological conditions by using RS2 software for determining stresses across the tunnel surrounding and to give a best suitable excavation pattern for construction of tunnel.

scholarly journals Mechanical Aspects of Construction of New TBM Tunnel Under Existing Structures

2021 ◽  
Author(s):  
Wu Ke ◽  
Zhang zheng ◽  
Li Shuchen ◽  
Zhou leisheng ◽  
Zhao Jiahui ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Complex Mixture ◽  
Simulation Software ◽  
Tunnel Construction ◽  
Ground Settlement ◽  
Ground Structure ◽  
Existing Structures ◽  
Tbm Cutter ◽  
Cutter Head ◽  
Surrounding Soil

AbstractIt is inevitable for the construction of subways to pass under the existing structures in the city; this will cause settlement of the existing structures and affect their safety. The soil is a complex mixture, and hence it is difficult to determine the damage caused by construction using tunnel boring machine (TBM) method to the stress balance of the surrounding soil. Normally, settlement and uplift of the surface are caused during tunneling. Therefore, large-scale 3D simulations are needed to study the interaction between mechanically driven tunnel construction and the surrounding soil to estimate the expected settlement and related damage risks to the existing structures, especially in tunnel construction in urban areas. Qingdao Metro Line 1 in the Haixiao section (Xiaocunzhuang and Haiboqiao stations) was taken up as the research object to study the trend and degree of the effect of TBM tunnel construction using the numerical simulation software Midas GTS NX. The numerical simulation results and measured data were used for the reliability analysis to study the influence of different digging speeds and pressures in TBM construction on ground subsidence, and the effect of vibrations generated at the tunnel face by the TBM cutter head on the ground structure. It is shown that when other factors remain unchanged, the faster the driving speed, the smaller the ground settlement; the higher the surrounding rock pressure, the smaller the ground settlement. The vibration of the ground structure caused by the TBM cutter head complies with the relevant specifications. During construction, the driving parameters should be selected suitably depending on the available budget.

scholarly journals Mechanical aspects of construction of new TBM tunnel under existing structures

2021 ◽  
Author(s):  
Wu Ke ◽  
Zheng Zhang ◽  
Chen Shu Li ◽  
Sheng Lei Zhou ◽  
Hui Jia Zhao ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Complex Mixture ◽  
Simulation Software ◽  
Tunnel Construction ◽  
Ground Settlement ◽  
Ground Structure ◽  
Existing Structures ◽  
Tbm Cutter ◽  
Cutter Head ◽  
Surrounding Soil

Abstract It is inevitable for the construction of subways to pass under the existing structures in the city; this will cause settlement of the existing structures and affect their safety. The soil is a complex mixture, and hence it is difficult to determine the damage caused by construction using tunnel boring machine (TBM) method to the stress balance of the surrounding soil. Normally, settlement and uplift of the surface are caused during tunneling. Therefore, large-scale 3D simulations are needed to study the interaction between mechanically driven tunnel construction and the surrounding soil to estimate the expected settlement and related damage risks to the existing structures, especially in tunnel construction in urban areas. Qingdao Metro Line 1 in the Haixiao section (Xiaocunzhuang and Haiboqiao stations) was taken up as the research object to study the trend and degree of the effect of TBM tunnel construction using the numerical simulation software Midas GTS NX. The numerical simulation results and measured data were used for the reliability analysis to study the influence of different digging speeds and pressures in TBM construction on ground subsidence, and the effect of vibrations generated at the tunnel face by the TBM cutter head on the ground structure. It is shown that when other factors remain unchanged, the faster the driving speed, the smaller the ground settlement; the higher the surrounding rock pressure, the smaller the ground settlement. The vibration of the ground structure caused by the TBM cutter head complies with the relevant specifications. During construction, the driving parameters should be selected suitably depending on the available budget.

Impact of Double-O-Tube Shield Tunnel Construction on Grillage Beams Foundation Frame Building

2011 ◽  
Vol 71-78 ◽  
pp. 32-36 ◽  
Author(s):  
Xin Jiang Wei ◽  
Jie Hong ◽  
Gang Wei
Keyword(s):  
Principal Stress ◽  
Differential Settlement ◽  
Shield Tunnel ◽  
Tunnel Construction ◽  
Foundation Settlement ◽  
Ground Settlement ◽  
Shield Tunneling ◽  
Frame Building ◽  
Shield Machine ◽  
The Impact

Considering the interaction of building-soil-tunnel, the grillage beams foundation frame building vertical crossed by Double-O-Tube (DOT) shield tunnel was simulated by 3D MIDAS/ GTS software, and the impact of construction on the building was analyzed. The results show that: the ground settlement trough caused by DOT shield tunnel can be fitted by peck formula; during the passage of the shield tunneling through the building, the settlement of the building increased and settlement trough was wilder; the settlement was stable and had a little rebound when shield machine already passed the building; with the increase of driving distance, the first principal stress P1 increased and then was stable; with the increase of L, the shape of foundation settlement curve changed, and the maximum differential settlement between columns increased but was small.

scholarly journals Strengthening Effect of the External Prestressing Method That Simulated a Deterioration Bridge

2021 ◽  
Vol 11 (6) ◽  
pp. 2553
Author(s):  
Sang-Hyun Kim ◽  
Jong-Sup Park ◽  
Woo-Tai Jung ◽  
Jae-Yoon Kang
Keyword(s):  
Compressive Strength ◽  
Strengthening Effect ◽  
Reinforcement Effect ◽  
Loading Test ◽  
Yield Load ◽  
Existing Structures ◽  
External Prestressing ◽  
The Difference ◽  
Existing Structure ◽  
Strengthening Method

Various methods for strengthening existing structures have been developed owing to the increase in human and property damages caused by the deterioration of structures. Among the various reinforcing methods, the external prestressing method increases the usability and safety of a structure by directly applying tension to the weak tensile area that suffers the greatest deflection during the structure usage. The external prestressing method is advantageous in reducing cracks caused by the introduced tension and restoration of the deflection. Since the strengthening method is applied to deterioration bridges, the strengthening effect is affected by the condition of the existing structure. However, studies on the strengthening effect according to the degree of deterioration are insufficient. Therefore, the behavior according to the strengthening status was analyzed, and the strengthening effect was identified in this study by simulating the deteriorated bridge, reducing the compressive strength and reinforcement quantity, and conducting a four-point loading test. As a result of the experiment, a reinforcement effect of 215% crack load, 161% yield load, and the difference in behavior according to the reinforcement parameters were confirmed.

Assessing the seasonal variability of shallow underground waters quality from a volcanic – sedimentary formation during El Niño event in Panama

2021 ◽  
Author(s):  
Mario Luis Miranda Montenegro ◽  
Ana Garcia ◽  
Raizha Batista ◽  
Obdulia de Montilla ◽  
Arkin Tapia ◽  
...  
Keyword(s):  
Drinking Water ◽  
El Niño ◽  
Urban Areas ◽  
El Nino ◽  
Anthropogenic Activity ◽  
Human Populations ◽  
Ph Values ◽  
El Niño Event ◽  
Geological Conditions ◽  
Groundwater Reserves

Abstract Providing drinking water to growing populations has become a worldwide concern. Therefore, in many countries some groundwater reserves are now being used to supply drinking water in remote urban areas. The state of these groundwater reserves is strongly influenced by the local geological conditions. Furthermore, climate change has caused a decrease in the periodicity of environmental conditions such as rainfalls, a key driver in replenishing these reserves. In 2019, the weak El Niño event affected the rainfall pattern, as well as physical and chemical quality of shallow ground waters in Panama. Within this study, the northwestern central region of Panama groundwaters have been systematically characterized during El Niño 2018 – 2019 event. Our results indicate that changes in values of physicochemical parameters such as alkalinity, pH and conductivity are related to changes in the amount of rainfall reported in the region starting from dry season (DS) to the rainy season (RS). Chloride was recorded as an indicator of anthropogenic activity and/or the effect of human populations on specific sites in the aquifer recharge zones. Lead (Pb2+), Zinc (Zn2+), Manganese (Mn2+), and Copper (Cu2+) concentrations in the groundwater were evaluated during the DS and RS 2019. Recorded data indicates sub – lethal concentrations of Pb2+, Zn2+, Mn2+ were associated to changes in alkalinity values of groundwater during the DS. While during the RS, a decrease in pH values favored the dissolution of Cu2+ and Zn2+. Our findings suggest that seasonal rainfall deficits modify shallow underground water alkalinity and pH values, inducing the redissolution of Pb2+, Zn2+, Mn2+, Cu 2+and exposing populations to sub – lethal concentrations of those microelements.

The Comparison of Tunnel Engineering Construction Methods for Renhechang Tunnel Crossing Underneath Existing Tunnel on Lanzhou-Chongqing Railway

2013 ◽  
Vol 405-408 ◽  
pp. 1330-1333 ◽  
Author(s):  
Chuan Yi Sui ◽  
Xu Dong Zhou ◽  
Lin Hui Wang
Keyword(s):  
Field Measurement ◽  
Measurement Data ◽  
Tunnel Construction ◽  
Tunnel Engineering ◽  
Engineering Construction ◽  
Existing Structures ◽  
Construction Methods ◽  
Tunneling Method ◽  
Simulation Results ◽  
The Cross

Problems often exist in construction of transportation tunnels, such as the effect of new tunnels constructed close to existing structures. Solving this magnificent problem by carefully choosing tunnel construction methods will be beneficial to minimize effects on existing structures while ensuring the newly constructed tunnel is both time-consuming and economical. Three representative engineering methods-the benching tunneling method, the Center Diaphragm method and the Cross Diaphragm method-are compared in controlling the settlement of new tunnel vault and the deformation of the existing tunnel. Finally checking the simulation results by comparing with field measurement data.

Research on Advanced Geological Forecast Technology in the Large and Complex Underground Projects

2014 ◽  
Vol 608-609 ◽  
pp. 756-760
Author(s):  
Hong Wen Zhou ◽  
Chun Ying Lei ◽  
Yi Jun Shang ◽  
Jian Feng Zhang ◽  
Wei Wei ◽  
...  
Keyword(s):  
Coming Out ◽  
Multiple Solutions ◽  
Construction Project ◽  
Geophysical Methods ◽  
Construction Process ◽  
Underground Construction ◽  
Forecast System ◽  
Geological Interpretation ◽  
Combination Forecasting ◽  
Geological Conditions

The multi-hazard, wide-covered, complex factors during the large complex underground construction process pose severe challenges to the construction project. With the help of successful forecast cases, typical geological interpretation signs, optimization of combination forecasting scheme, comprehensive geological forecast system is constructed to effectively solve the disadvantage of multiple solutions coming out from the single geophysical methods, and greatly improve the accuracy of forecast of adverse geological conditions, thus ,the target of safety, economical operation and efficiency is achieved.

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