Influence Research on Pit Excavation Close to Existing Shield Tunnel

2013 ◽  
Vol 671-674 ◽  
pp. 54-59
Author(s):  
Lin Liu ◽  
Peng Fei Ge ◽  
Gang Wei ◽  
Zhi Jie Ying ◽  
Can Fang Luo ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Theoretical Analysis ◽  
Deformation Mechanism ◽  
Negative Impact ◽  
Horizontal Displacement ◽  
Measured Data ◽  
Horizontal Direction ◽  
Shield Tunnel

Pit excavation has a negative impact on the existing shield tunnel close to it. The deformation mechanism of the existing tunnel during the pit excavation was analyzed. Theoretical analysis results shows: excavation unloading decreases the pressure in horizontal direction of the tunnel, which causes tunnel taking the horizontal displacement to the pit side; convergent deformation keeps in horizontal stretching, vertical compression, but the deformation is aggravated; tunnel vertical uplift or settlement is determined by the pit excavation depth; precipitation would make tunnel sinking. Five domestic pit excavation engineering instance was collected, and the reliability of the analysis in this article is proved by the statistical analysis of the measured data.

Analysis on Influence of Shield Tunneling on Bridge Double Pile

2015 ◽  
Vol 777 ◽  
pp. 3-7
Author(s):  
Pei Sheng Xi ◽  
Xiao Zhao ◽  
Zhen Li
Keyword(s):  
Horizontal Displacement ◽  
Horizontal Direction ◽  
Shield Tunnel ◽  
Tunnel Construction ◽  
Ground Settlement ◽  
Lagrangian Analysis ◽  
Shield Tunneling ◽  
Tunnel Excavation ◽  
Pile Deformation ◽  
Main Deformation

Shield tunneling have varying degrees of impact on the surrounding buildings and the surrounding environment. Based on the shield tunneling of Hefei Subway Line 1 Ma'anshan viaduct, a 3D Fast Lagrangian Analysis of Continua is be used to simulate the shield tunnel construction and analyze the ground settlement and bridge pile deformation caused by tunnel construction. The numerical modeling results by analyzing the displacement variation and soil affected area at different distances show that when the shield tunnel excavation, the ground settlement becomes smaller with increasing distance from the shield center line of the pile and the maximum ground settlement is 10.778mm. The main deformation of bridge pile is in horizontal direction with a maximum horizontal direction of 2.0758mm. Horizontal displacement changes lager at the top of the pile, along with changes in the horizontal displacement of the pile depth becomes smaller, 15m is a turning point.

Regression Analysis on Influences of Hem Parameters on Flare Sagging of Semi-Circular Skirt

2011 ◽  
Vol 331 ◽  
pp. 594-598
Author(s):  
Hong Ni
Keyword(s):  
Regression Analysis ◽  
Statistical Analysis ◽  
Measured Data ◽  
Silk Fabric ◽  
Linear Regression Equation ◽  
Analysis Software ◽  
Wool Fabrics ◽  
Object Of Study ◽  
The Relationship ◽  
Statistical Analysis Software

Select 45 pieces of silk, cotton and wool fabrics in total, with semi-circular skirt modeling as object of study, investigate the relationship between flare sagging in straight & inclined grains of skirt pieces and fabric types, analyze the influence of hem parameters on flare sagging of semi-circular skirt and obtain multiple linear regression equation by disposing the measured data with SPSS statistical analysis software. The study result shows that the skirt hem of silk fabric is sagging more significantly than that of cotton and wool fabrics and there is a multi-linear relationship between semi-circular flare sagging and parameters.The research of this subject has both theoretical value and practical value.

Direct structural and mechanistic insights into fast bimolecular chemical reactions in solution through a coupled XAS/UV–Vis multivariate statistical analysis

2021 ◽  
Vol 50 (1) ◽  
pp. 131-142 ◽  
Author(s):  
Francesco Tavani ◽  
Giorgio Capocasa ◽  
Andrea Martini ◽  
Francesco Sessa ◽  
Stefano Di Stefano ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Theoretical Analysis ◽  
Chemical Reactions ◽  
Multivariate Statistical Analysis ◽  
Organic Substrates ◽  
Multivariate Statistical ◽  
Bimolecular Reactions ◽  
Innovative Method

A combined multivariate and theoretical analysis of coupled XAS/UV–Vis data was proven to be an innovative method to obtain direct structural and mechanistic evidence for bimolecular reactions in solution involving organic substrates.

Effect Analysis of Double-Line Parallel Shield Tunnel Crossing Frame Structure Building Based on GTS

2011 ◽  
Vol 99-100 ◽  
pp. 1082-1086 ◽  
Author(s):  
Gang Wei ◽  
Qi Gang Guo ◽  
Jie Hong
Keyword(s):  
Principal Stress ◽  
Horizontal Displacement ◽  
Differential Settlement ◽  
Frame Structure ◽  
Shield Tunnel ◽  
Maximum Shear Strain ◽  
Effect Analysis ◽  
Double Line ◽  
Frame Building ◽  
The Right

Considering the interaction of building-soil-tunnel, the grillage beams foundation frame building vertical crossed by Double-Line (DL) parallel shield tunnel was simulated by 3D MIDAS/GTS software. The results show that: after left-shield tunnel construction had done, during the passage of the right shield tunnelling, the differential settlement decreased gradually, settlement is slightly larger than the left when the right tunnel had ready crossed the building. Uneven settlement first increases, and then decreases gradually tends to zero. Lateral horizontal displacement changes little, and longitudinal horizontal displacement first increased and then decreases. The building’s maximum first principal stress exceeds the standard value, which may cause cracking. With the increase of L the distance from frame axis to the axis of the two tunnels, the first principal stress P1 and maximum shear strain MSmax tended to reduce in general. The maximum differential settlement between columns first increased and then decreased.

Numerical Simulation on Effect of Shield Tunnel Construction on Pipelines with 45* Skew Angle and Tunnel

2014 ◽  
Vol 889-890 ◽  
pp. 1414-1416
Author(s):  
Dong Liang Guo ◽  
De Shen Zhao
Keyword(s):  
Horizontal Displacement ◽  
Vertical Displacement ◽  
Shield Tunnel ◽  
Tunnel Construction ◽  
Analysis Model ◽  
Skew Angle ◽  
Element Analysis ◽  
Tunnel Excavation ◽  
Soil Movement ◽  
The Right

Shield tunnel construction cause soil movement to harm the adjacent underground pipelines. This paper, taking Dalian Spring Street subway station as the background, uses the finite difference software to establish 3-D finite element analysis model to simulate the deformation of pipeline with 45* skew angle in the tunnel construction work. The results show: when the left tunnel push towards pipelines, due to the skew of the pipeline and tunnel, vertical displacement of pipelines is a certain shift to the left. When the right tunnel excavation is complete, the pipeline maximum settlement has a return to the center of the two tunnels. The settlement of pipeline is much bigger than horizontal displacement.

scholarly journals Improvement of Automatic Measurement Evaluation System for Subway Structures by Adjacent Excavation

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7492
Author(s):  
Jung-Youl Choi ◽  
Sun-Hee Kim ◽  
Ho-Hyun Lee ◽  
Jee-Seung Chung
Keyword(s):  
Statistical Analysis ◽  
Evaluation System ◽  
Automatic Measurement ◽  
Measured Data ◽  
Automated Measurement ◽  
Method Evaluation ◽  
Average Value ◽  
Measurement Evaluation ◽  
Measurement Methodology ◽  
Track Deformation

This study evaluated the structural stability of subway structures based on adjacent excavations by comparing automatically measured and numerically analyzed data. The reliability of the automated measurement methodology was evaluated by first applying probability statistical analysis to the measured results and then comparing these results with the numerically analyzed results. An improvement in the calculation method evaluation system, including the method of processing and analysis of the automatically measured data of subway structures through the average value of probability density, was proposed. As a result of the field measurement and numerical analysis, the measured results of tunnel displacement and track deformation exhibited some differences. However, it was determined that the construction stage and location where the maximum values of the tunnel displacement and track deformation occurred had similarities.

scholarly journals Reinforcement Effects of Isolation Piles on the Adjacent Existing Tunnel in Building Construction

2019 ◽  
Vol 2019 ◽  
pp. 1-21 ◽  
Author(s):  
Aijun Yao ◽  
Jian Lu ◽  
Yanfei Guo ◽  
Jiantao Zhang ◽  
Haifeng Guo
Keyword(s):  
Horizontal Displacement ◽  
Building Construction ◽  
Shield Tunnel ◽  
Engineering Practice ◽  
Burial Depth ◽  
Tunnel Structure ◽  
Reinforcement Effect ◽  
Foundation Pit ◽  
Pile Spacing ◽  
Pile Diameter

Similar material model test and numerical simulation method were used to study the reinforcement effect of isolation piles on the existing shield tunnel structure in the adjacent building construction for analyzing foundation pit excavation and new building construction approaching existing shield tunnel engineering. The numerical simulation orthogonal experiment was used to optimize four isolation pile parameters. The conclusions were obtained as follows: (1) Isolation piles could share horizontal load of the soil at the rear side of the support structure and reduce horizontal displacement of the soil. As a result, maximum horizontal displacement of the tunnel structure and differences in horizontal displacement between the tunnel structure roof and the floor after foundation pit excavation and building loading were decreased. The horizontal displacement and torsional deformation of the tunnel structure toward the direction of the foundation pit were controlled, and the increase in internal forces of the transverse tunnel structure was also restrained. (2) At the elevation above the tunnel roof, the increase in burial depth of the isolation pile top slightly affected the reinforcement effect on the tunnel structure. The increase in burial depth of the isolation pile bottom could improve the reinforcement effect. Thus, burial depth of the isolation pile bottom should be properly increased in the engineering practice. The reduction in pile spacing could improve the reinforcement effect. Accordingly, pile spacing should be properly selected in the engineering practice. With the increase of diameter of the isolation pile, the reinforcement effect of isolation piles increased obviously. (3) Pile diameter had the greatest influence on the reinforcement effect of isolation piles, followed by burial depth of the pile bottom, pile spacing, and burial depth of the pile top. Orthogonal experiments indicated the following optimal parameter values: a pile diameter of 1.2 m, a burial depth of the pile bottom of 2H, a pile spacing of 1.6 m, and a burial depth of the pile top of 0.75Z.

Statistical Analysis of Environmental Protection Expenditures in Russia

2020 ◽  
Vol 27 (1) ◽  
pp. 85-96
Author(s):  
R. S. Gaysin ◽  
Yu. N. Romantseva ◽  
A. E. Ulyankin
Keyword(s):  
Statistical Analysis ◽  
Environmental Protection ◽  
Negative Impact ◽  
State Level ◽  
Production Costs ◽  
Household Waste ◽  
Actual State ◽  
Factors Affecting ◽  
Gdp Growth Rate ◽  
State Of The Environment

The topical relevance of this study lies in the current state of the environment in Russia. It is assessed as unfavorable, and this fact is recognized both by the scientific community and at the state level, which determines the need for an integrated study of costs aimed at protecting the environment and improving the ecological situation. One of the article’s objectives was to conduct an appropriate statistical analysis both for Russia as a whole and for selected regions. For that purpose, the volumes, structure, and dynamics of environmental protection expenditures and some factors affecting their value were comprehensively studied; the differentiation of the Russian regions by the level of expenditures was examined. The authors substantiated the areas of environmental protection based on econometric modeling.This study, in particular, revealed a fairly close relationship between economic growth and the generation of both production and consumption wastes. At the same time, it was established that the country’s gross domestic product (GDP) growth rate is significantly lower than the growth in waste generation, which is explained by several reasons, including budgetary ones. This situation, in turn, was reflected in the ratio of environmental protection costs to GDP. The observed situation of a very slow reduction, stabilization or even growth of the negative impact of economic entities on the environment in a number of regions of the country and for specific indicators, as well as an increase in the generation of household waste (i.e. among the population), requires an adequate increase in the costs of enterprises and budgets of all levels aimed at environmental protection and rationalization of environmental management. This in principle leads to an increase in production costs and calls for a redistribution of budget expenditures from the production and social sphere to the environmental sector. The use of econometric modeling to highlight the factors that influence the level of costs by region has shown that their value depends primarily on the population density and the actual state of the environment.

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