scholarly journals Land Subsidence Caused by Urban Metro Tunnel Construction

2015 ◽  
Vol 2 ◽  
pp. 29
Author(s):  
Yang Hao
Keyword(s):  
Land Subsidence ◽  
Rapid Development ◽  
Economic Losses ◽  
Tunnel Construction ◽  
Safety Hazards ◽  
Tunnel Excavation ◽  
Excavation Process ◽  
Potential Safety ◽  
Metro Tunnel ◽  
And Control

<p>With the development of urban transportation, city buses are unable to accommodate daily ground transportation for the public in life, work and study; therefore, urban metro gains rapid development. However, metro tunnel construction would initiate land subsidence issues which bring significant potential safety hazards and economic losses. In order to reduce irrelevant economic losses, this paper discusses the land subsidence issues from three perspectives: analysis of land subsidence, land subsidence safety judgment and control and shallow tunnel excavation method in tunnel construction used to control land subsidence. The paper indicates that there are major geotechnical engineering issues encountered during urban metro tunnel excavation process. The individuals in charge of implementation should optimize tunnel construction regulations and ensure all works are implemented scientifically, regularly and orderly in order to reduce the impacts on land subsidence caused by tunnel construction.</p>

scholarly journals The interaction between land subsidence and urban development in China

2015 ◽  
Vol 372 ◽  
pp. 471-474
Author(s):  
Y. Yang ◽  
R. Wang ◽  
Y. Zhou ◽  
Y. Jiang ◽  
X. Wang
Keyword(s):  
Water Resources ◽  
Urban Development ◽  
Land Subsidence ◽  
Yangtze River Delta ◽  
Economic Losses ◽  
Safety Hazards ◽  
Potential Safety ◽  
Northern Chinese ◽  
Over Exploitation ◽  
The Relationship

Abstract. The Yangtze River Delta and North China Plain are experiencing serious land subsidence development and are also the areas that have undergone the fastest urbanization. Rapid urban development inevitably requires more water resources. However, China is a country with small per capita water resources, nonuniform distribution of water resources, and over-exploitation of groundwater – all of which are critical factors contributing to the potential for a land subsidence disaster. In addition, land subsidence has brought about elevation loss, damaged buildings, decreased safety of rail transit projects, lowered land value, and other huge economic losses and potential safety hazards in China. In this paper, Beijing, a typical northern Chinese city deficient in water, is taken as an example to explore (a) the problems of urban development, utilization of water resources, and land subsidence development; (b) the harm and influence of land subsidence hazards on urban construction; and (c) the relationship between urban development and land subsidence. Based on the results, the author has predicted the trend of urban development and land subsidence in Beijing and puts forward her viewpoints and suggestions.

scholarly journals Reflection on Prevention and Control of Telecommunication Network Fraud in Big Data Era

2020 ◽  
Vol 2 (2) ◽  
pp. 42
Author(s):  
Xingrui Wang
Keyword(s):  
Big Data ◽  
Communication Technology ◽  
Telecommunication Network ◽  
Rapid Development ◽  
Economic Losses ◽  
The Public ◽  
Telecommunication Equipment ◽  
The Masses ◽  
And Control ◽  
Big Data Technology

<p>With the rapid development of smart phones and communication technology, the frequency of communication between the public and society through telecommunication equipment is increasing. At the same time, some lawless elements often cheat the public through telecommunication equipment, which brings irreparable economic losses to the society and the masses to a certain extent. In view of the above problems, this article takes the source of telecommunication fraud as the breakthrough point, analyzes the existing telecommunication fraud processing technology and points out its shortcomings, and then proposes a method of telephone fraud analysis based on big data technology. This technology fills the defects of the existing telecommunication interception technology and provides a new idea for effectively avoiding telecommunication fraud in the future.</p>

Finite Element Analysis for the Displacement Characteristics of Loess Tunnel with Weak Surrounding Rock

2012 ◽  
Vol 487 ◽  
pp. 64-68
Author(s):  
Qian Zhang ◽  
Hai Xia Zhang ◽  
Jin Xing Lai
Keyword(s):  
Surface Deformation ◽  
Surrounding Rock ◽  
Tunnel Construction ◽  
Element Analysis ◽  
Tunnel Excavation ◽  
Qinghai Province ◽  
Elastic Plastic ◽  
Excavation Process ◽  
Reinforcement Measures ◽  
Weak Surrounding Rock

Backed up by Dayoushan loess tunnel of Xining in Qinghai province, the displacements of vault settlement, peripheral convergence, surface deformation and post-construction settlement caused by tunnel construction are numerically simulated and analyzed. First, 2-D elastic-plastic model is founded to simulate the tunnel excavation process with up and down steps method. Second, considering the rheological characteristics of loess, 2-D visco-elastic-plastic constitutive model is founded to simulate the creep deformation of rock displacement characteristics. Finally, combined with the serious collapsible feature of loess foundation in supported project, the post-construction settlements under different conditions are simulated to obtain the settlement values of tunnel vault and bottom. The results can explain the deformation laws of tunnel displacement characteristics reasonably and show the importance of foundation reinforcement measures for loess tunnel.

scholarly journals Numerical simulation of land subsidence caused by subway train vibration using PFC

2020 ◽  
Vol 382 ◽  
pp. 559-564
Author(s):  
Jianxiu Wang ◽  
Yansheng Deng ◽  
Na Xu ◽  
Tianliang Yang ◽  
Xuexin Yan ◽  
...  
Keyword(s):  
Land Subsidence ◽  
Mechanical Response ◽  
Geological Environment ◽  
Bond Model ◽  
Engineering Activity ◽  
Metro Tunnel ◽  
Subway Train ◽  
And Control ◽  
Train Vibration ◽  
Regional Land

Abstract. Subsidence induced by human activity and urbanization is distributed in an area or along a line. In Shanghai, China, land subsidence is distributed along the belt near a subway line. The subsidence is caused by train vibration as well as regional land subsidence and other engineering activity. In order to figure out the mechanical response of the tunnel surroundings, the PFC2D software based on a discrete element method is introduced to simulate a section of the metro tunnel. The linear contact bond model was employed to reflect the characteristics of clay. Based on the analysis of stress and settlement caused by dynamic cyclic loading, the mechanical response law and subsidence mechanism were investigated. In addition, the influence of frequency on settlement was also analyzed: the greater the frequency, the more particles were rearranged and the larger the settlement. The fraction of sliding contacts was introduced to explain this phenomenon. The results can be used to understand, predict and control land subsidence to protect the geological environment.

scholarly journals Land Subsidence Control Zone and Policy for the Environmental Protection of Shanghai

2019 ◽  
Vol 16 (15) ◽  
pp. 2729 ◽  
Author(s):  
Xi-Cun He ◽  
Tian-Liang Yang ◽  
Shui-Long Shen ◽  
Ye-Shuang Xu ◽  
Arul Arulrajah
Keyword(s):  
Land Subsidence ◽  
Urban Areas ◽  
Monitoring Network ◽  
Point Of View ◽  
Groundwater Withdrawal ◽  
Economic Losses ◽  
Control Zone ◽  
Sustainable Environment ◽  
Subsidence Monitoring ◽  
And Control

Land subsidence was once a major geo-hazard in the city of Shanghai, China. From 1921 to 1965, the maximum cumulative land subsidence in the urban areas of China reached 2.6 m. This large subsidence has resulted in high economic losses for Shanghai. The Regulation of Prevention and Control of Land Subsidence of Shanghai Municipality was published in 2013 (simply cited as the 2013-regulation in the following context). The characteristics of the 2013-regulation included the combination of the subsidence monitoring network and the groundwater detection network due to both the effects of groundwater withdrawal and construction. In addition, the setting up of a supervision system was also incorporated in the 2013-regulation. To control the land subsidence, Shanghai demarcated three land subsidence control zones, where special measures have been implemented. From a strategic environmental assessment (SEA) point of view, the 2013-regulation attains a high total score, indicating that the control of groundwater withdrawal and recharge is effective. The observed land subsidence over the past six years also confirms the effectiveness of the 2013-regulation with the most consideration of SEA for sustainable environment protection in Shanghai. However, more effort should be made in the implementation of SEA in land subsidence control in the future.

Study on Risks and Countermeasures of Shallow Biogas during Construction of Metro Tunnels by Shield Boring Machine

2021 ◽  
pp. 036119812199459
Author(s):  
Xi Jiang ◽  
Yuxin Zhang ◽  
Zhuanzhuan Zhang ◽  
Yun Bai
Keyword(s):  
Risk Identification ◽  
Tunnel Construction ◽  
Construction Process ◽  
Shield Tunneling ◽  
Daily Lives ◽  
Construction Experience ◽  
Property Loss ◽  
Potential Risks ◽  
Metro Tunnel ◽  
And Control

With the intensive development of cities, the utilization of underground space has attracted more and more attention from industry and academia. Underground rail (metro) in cities has become an imperative mode for people in their daily lives. Meanwhile, the safety of rail tunnel construction has constantly been a challenging issue because of the presence of complex strata containing shallow biogas. Accidents in tunnel construction because of shallow biogas which resulted in massive casualties and property loss have been reported in some recent literature. The excavation of formations containing shallow biogas not only poses a threat to the safety of the earlier stage of tunnel construction but also affects the later operation of metro lines. Therefore, the safety problem caused by shallow biogas should be taken into consideration seriously and avoided in the pre-construction stage. A typical underwater metro tunnel, Hangzhou Metro Line 6, is introduced in this study to suggest the proper approach to deal with the biogas problem during the construction process. The generation mechanism of shallow biogas is clarified and the process of identifying biogas risk during strata exploration is also discussed. A risk identification and control system for shield tunneling through biogas strata is proposed to mitigate the potential dangers of shallow biogas during the construction process. This study provides actual construction experience and countermeasures for other similar metro tunnel projects that encounter biogas strata to diminish the potential risks and avoid severe accidents.

Analysis Based on FLAC3D of Surface Subsidence Caused by a Double-Tube Parallel Tunnel Excavation

2013 ◽  
Vol 395-396 ◽  
pp. 443-446
Author(s):  
Dong Liang Guo ◽  
De Shen Zhao
Keyword(s):  
Numerical Simulation ◽  
Finite Difference ◽  
Land Subsidence ◽  
Surface Subsidence ◽  
Ground Subsidence ◽  
Tunnel Construction ◽  
Tunnel Excavation ◽  
Spring Street ◽  
Practical Engineering ◽  
Parallel Tunnel

In the double-tube parallel tunnel excavation cross-range, it will result in a larger superimposed surface subsidence, and even induce land subsidence to cause the accident. This paper uses the finite difference FLAC3D software to have a numerical simulation on double-tube parallel tunnel excavation of Dalian Spring Street Station. The land subsidence law of a double-tube parallel tunnel excavation which is obtained by analyzing the vertical and longitudinal settlement curve can predictable similar ground subsidence caused by tunnel construction and guide the safety construction of practical engineering

scholarly journals Big Data Technology in Intelligent Management and Control System of Drainage Pipe Network

2021 ◽  
Vol 2143 (1) ◽  
pp. 012023
Author(s):  
Su Hu ◽  
Wanhui Zhang
Keyword(s):  
Big Data ◽  
Control System ◽  
Rapid Development ◽  
Economic Losses ◽  
Pipe Network ◽  
Urban Flood ◽  
Drainage Pipe ◽  
Intelligent Management ◽  
And Control ◽  
Big Data Technology

Abstract With the rapid development of urban construction, smart city has become an important trend in the future, which is inseparable from the intellectualization of drainage pipe network. At the same time, with the increasing frequency of urban flood disasters, the old drainage pipe network system will cause significant economic losses, which requires modern cities to establish intelligent management and control of drainage pipe network. However, the situation of drainage facilities in most cities in China is complex, which requires strengthening modern means such as monitoring, operation management and planning services. Therefore, the research on intelligent management and control system of drainage pipe network based on big data technology is of great significance. Firstly, this paper analyzes the importance of intelligent management and control system. Then, this paper puts forward the main algorithms for big data processing. Finally, this paper constructs the intelligent management and control system of drainage pipe network.

Prediction of Blast-Induced Ground Vibration Using Support Vector Machine by Tunnel Excavation

2012 ◽  
Vol 170-173 ◽  
pp. 1414-1418 ◽  
Author(s):  
Dong Tao Li ◽  
Jing Long Yan ◽  
Le Zhang
Keyword(s):  
Support Vector Machine ◽  
Empirical Equation ◽  
Ground Vibration ◽  
Support Vector ◽  
Tunnel Construction ◽  
Blasting Vibration ◽  
Tunnel Excavation ◽  
Prediction And Control ◽  
And Control ◽  
Guiyang City

Beijing East Road No.1 tunnel in Guiyang city has the most complexity in arround, so prediction and control the blasting vibration is the most important task. In order to improve the accuracy of the prediction of the blasting vibration to mitigate the possible hazard in tunnel construction, studied on method of predicting peak particle velocity (PPV) using support vector machine (SVM) and established regression prediction model based on SVM. Comparisons between the predicted PPV using the empirical equation regression and SVM was made, find that the SVM gives much better prediction of PPV than does the empirical equation regression.

scholarly journals Research on Deformation Control Indicators and Standard of Urban Traffic Tunnel Construction Adjacent to High-rise Building

2020 ◽  
Vol 4 (6) ◽  
Author(s):  
Bo Shi ◽  
Kun Wang ◽  
Ke Li
Keyword(s):  
Environmental Problem ◽  
Deformation Mode ◽  
Comprehensive Analysis ◽  
Urban Traffic ◽  
Tunnel Construction ◽  
Tunnel Excavation ◽  
Deformation Control ◽  
High Rise ◽  
Under Construction ◽  
And Control

The biggest environmental problem caused by the construction of tunnels adjacent to high-rise buildings is the settlement of buildings. The paper analyzes the influence of tunnel excavation on the deformation of the superstructure and the deformation mode of the superstructure. It introduces the indicators and standards for the construction control of tunnel adjacent to the building at home and abroad. Combined with the Yuzhong tunnel project under construction in Chongqing, the main monitoring indicators and control standards of the Yuzhong Tunnel passing through the main buildings are given after comprehensive analysis and considerations, which provide a reference for the deformation control indicators of similar urban traffic tunnels adjacent to high-rise buildings.

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