Intrinsically Safe in the Tunnel Construction under Complex Geological Conditions

2012 ◽  
Vol 204-208 ◽  
pp. 1327-1330
Author(s):  
Hui Liu ◽  
Zhen Xie
Keyword(s):  
Production Process ◽  
Operating Conditions ◽  
Tunnel Construction ◽  
Tunnel Engineering ◽  
Project Risk ◽  
Safety Control ◽  
Safe Production ◽  
Geological Conditions ◽  
Process Machinery

This article refers to the concept of intrinsically safe that emphasizes the production process, machinery equipment and fixtures which can create a safe production operating conditions for the operator. Combined with the tunnel engineering live telecast, for the complex geological conditions and the difficult safety control of the tunnel engineering, and through the essential safety of tunnel construction analysis, the tunnel project risk will be control effectively.

Engineering Characteristics of Talus and its Influence Imposed on Tunneling

2015 ◽  
Vol 744-746 ◽  
pp. 962-965
Author(s):  
Xiang Yang Jiang ◽  
Yong Ping Xu
Keyword(s):  
Formation Mechanism ◽  
Southwest China ◽  
Field Investigation ◽  
Tunnel Construction ◽  
Tunnel Engineering ◽  
Engineering Characteristics ◽  
Geological Conditions

The special geological conditions of talus are often encountered in southwest China, it brings a lot of difficulties to tunnel construction. The formation mechanism and developmental properties of talus are analyzed in this paper. Based on field investigation on talus diseases, the hazard to tunnel engineering induced by talus and its corresponding measures are also analyzed. The results can be used for the safe and fast construction of tunnels which go through talus deposit.

Research on Water Ecology of Tunnel Engineering in Arid and Semi-Arid Regions

2012 ◽  
Vol 212-213 ◽  
pp. 647-652 ◽  
Author(s):  
Guo Zhen Zhang ◽  
Qian Wang ◽  
Fu Ping Wu
Keyword(s):  
Water Pollution ◽  
Surface Water ◽  
Arid Regions ◽  
Water Environment ◽  
Tunnel Construction ◽  
Construction Process ◽  
Tunnel Engineering ◽  
Surface Water And Groundwater ◽  
Semi Arid ◽  
Water Ecology

This article focuses on the tunnel construction process in arid and semi-arid regions which producing water environment problems ,proposing to initialize the control for the water pollution, containment of surface water and groundwater quality deterioration and loss of water and soil in the process of tunnel construction.The water eco-system of tunnel engineering in the arid and semi-arid regions is researched and established, so as to achieve the control for the surface water and groundwater pollution problems of tunnel project in arid and semi-arid regions, and to provide relevant guidance for the tunnel project.

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.

Imaging the Geology Ahead of a Tunnel Using Seismics and Adaptive Polarization Analysis

2020 ◽  
Vol 25 (2) ◽  
pp. 189-198
Author(s):  
Lei Chen ◽  
Chao Fu ◽  
Xinji Xu ◽  
Lichao Nie
Keyword(s):  
Time Window ◽  
Geophysical Methods ◽  
Weighting Coefficient ◽  
Tunnel Construction ◽  
Polarization Analysis ◽  
Polarization Direction ◽  
Tunnel Face ◽  
Seismic Method ◽  
Imaging Results ◽  
Geological Conditions

The seismic method is one of the main geophysical methods that are widely used to image the geology ahead of tunnels during tunnel construction. However, owing to the complex environment and limited observation aperture in a tunnel, symmetric false results (that appear in imaging results but not in the actual environment) frequently occur in imaging results. In a symmetric false reflection, false and true reflection points are axisymmetric around the tunnel axis. Such false results frequently cause errors in the interpretation of the geological conditions ahead of a tunnel face. To overcome this problem, a seismic method that uses adaptive polarization analysis was adopted to better image geological conditions. Based on an adaptive time window, the polarization characteristics of seismic signals were analyzed to calculate the main polarization direction. The symmetric false results in imaging results were suppressed by adopting a weighting coefficient based on the angle between the main polarization direction and ray direction. Numerical simulations revealed the superiority of the method when applied to synthetic data processing. Moreover, the method was applied to a diversion tunnel. The method successfully identified the fracture zones ahead of the tunnel face, thus significantly enhancing the safety of tunnel construction.

scholarly journals THE RELEVANCE OF CHANGING THE DESIGN SOLUTION COVERAGE WITHOUT STRENGTHENING EXISTING FOUNDATIONS

2019 ◽  
Vol 7 (2) ◽  
pp. 42-49
Author(s):  
Ольга Хрянина ◽  
Ol'ga Hryanina ◽  
Мария Колесникова ◽  
Maria Kolesnikova
Keyword(s):  
Raw Materials ◽  
Technical Condition ◽  
Operating Conditions ◽  
Design Solution ◽  
Building Structures ◽  
Construction Site ◽  
Satisfactory Condition ◽  
Geological Conditions ◽  
Design Values ◽  
Instrumental Methods

The authors carried out the study of raw materials and their analysis, which allowed to identify the engineering-geological conditions of the construction site and outline the program of scientific and survey works. Full-scale and instrumental examination of the technical condition of the bearing and enclosing structures of the building. It is established that the building structures during operation have not received deformations that prevent normal operating conditions and are currently in satisfactory condition. The strength of concrete Foundation organoleptic and instrumental methods, which showed compliance with the design values. Analysis of verification calculations of the base, a satisfactory condition of the building structures showed that the structural solution of the coating can be changed and performed in kind without strengthening the existing foundations.

scholarly journals Demonstration and Analysis of Urban Traffic Tunnel Expansion Project Adjacent to Buildings

2021 ◽  
Vol 5 (2) ◽  
Author(s):  
Bo Shi ◽  
Kun Wang
Keyword(s):  
Construction Projects ◽  
Element Model ◽  
Urban Traffic ◽  
Tunnel Construction ◽  
Deformation Pattern ◽  
Construction Process ◽  
Safety Control ◽  
Project Scheme ◽  
Building Foundation ◽  
Dimensional Finite Element

With the increasing number of urban underground construction projects, the evaluation of the influence of tunnel expansion on building foundation is one of the important factors to be considered in the project. In this paper, the deformation of the upper structure and the deformation pattern of the upper structure were analyzed, and the two-dimensional finite element model was built based on the case of Chongqing Jiefangbei Underground Ring Road Expansion Project Scheme. Comparative analysis of the deformation and changes in stress of the two tunnel expansion construction schemes of full-frame support and bolt suspension was performed, and the safety, rationality and feasibility of the bolt suspension scheme was confirmed through project safety analysis. It is hoped that this paper will serve as a reference for similar projects in the safety control technology of tunnel construction process.

scholarly journals Web-based system for the traceability of cultivated Nile Tilapia based on ISO 12877: 2011

2021 ◽  
Author(s):  
Hember A. Lerdo-Morales ◽  
Ramona Evelia Chávez-Valdez ◽  
Patricia Elizabeth Figueroa-Millán ◽  
J. Reyes Benavides-Delgado ◽  
Elena Elsa Bricio-Barrios
Keyword(s):  
Production Process ◽  
Nile Tilapia ◽  
Field Investigation ◽  
Web Based ◽  
Iso Standard ◽  
Safety Control ◽  
Web Technologies ◽  
Traceability System ◽  
Additional Value ◽  
Future Work

Objective: To describe the systematization of the Nile tilapia cultivation process using a computer system for production and marketing traceability based on ISO 12877:2011 standard and web technologies. Design/methodology/approach: A documentary and field investigation were conducted to learn about the Nile tilapia production process currently applied; traceability was evaluated based on Double T and María del Carmen study cases, aquaculture farms located in the municipalities of Manzanillo and Armería located in the state of Colima, México; the process was contrasted with the ISO standard and the system was developed and implemented. Results: A Traceability System that records backward, internal, and forward procedural activities in the cultivation and marketing of tilapia. The system improves food safety control by registering lot care based on the ISO standard, resulting in well-defined traceable processes in the production and commercialization of the Nilotic tilapia. Limitations on study/implications: The results shown are related to the development and implementation of the system; however future work is yet to be carried out to assess its effect on the production and commercialization of farmed tilapia, as well as the efficiency of traceability. Findings/conclusions: The system was developed taking into consideration the necessary indicators for an ISO certification. Hence, aside from simplifying the registration and consultation of information, the producing company has the benefit of earning a certification for the aquaculture production process, creating additional value to its products.

scholarly journals Stability Analysis and Protection Measures of Large Section Tunnel in Coal Rich Weak Rock Stratum

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Guannan Zhou ◽  
Zijiang Zhao ◽  
Zhanping Song ◽  
Hongjian Wang
Keyword(s):  
Coal Seam ◽  
Large Scale ◽  
Economic Benefits ◽  
Surrounding Rock ◽  
Tunnel Construction ◽  
Weak Rock ◽  
Large Section ◽  
Tunnel Face ◽  
Finite Element Software ◽  
Geological Conditions

Due to poor engineering geological conditions of Liujiazhuang tunnel on Shanghai-Kunming Passenger Dedicated Line, the large deformation of weak rock occurs repeatedly during tunnel construction. In this paper, the large-scale finite element software ABAQUS is used to simulate the construction process of a large-section tunnel in weak surrounding rock. It is found that when tunnel face passes through the coal seam, the displacement and stress simulated by the bench method increase abruptly. The maximum stress reaches up to 18 MPa, and displacement reaches 45 mm, which is about twice when without crossing coal seam. It is technically feasible to use the bench method for tunnel construction, under the condition when large settlements is allowed; additionally, the bench method has better technical and economic benefits than that of the CD method. Through the comparative analysis of onsite monitoring data and numerical simulation results, it can be seen that the tunnel is in a dangerous state when passing through the coal seam and measures such as strengthening support or auxiliary advance support should be taken immediately to control the surrounding rock and to ensure tunnel construction safety.

Tunnel Prospecting Based on Integrated Interpretation of Geophysical Data: Xiangyun Tunnel, Yunnan Province, China

2019 ◽  
Vol 24 (1) ◽  
pp. 63-75
Author(s):  
Lei Chen ◽  
Fengkai Zhang ◽  
Yuxiao Ren ◽  
Xinji Xu ◽  
Zhichao Yang ◽  
...  
Keyword(s):  
Yunnan Province ◽  
Geological Mapping ◽  
Tunnel Construction ◽  
Tunnel Excavation ◽  
Horizontal Drilling ◽  
Adverse Conditions ◽  
Transient Electromagnetic ◽  
Geological Conditions ◽  
Electromagnetic Soundings ◽  
Integrated Interpretation

With China's expanding economy, many tunnels are being designed and constructed. However, tunneling in hazardous geologic terrain, with faults, fractures, water-bearing openings, and other adverse geological conditions, construction safety is seriously endangered. To ensure the safety of tunnel construction, a tunnel geological prospecting method was proposed and applied at the Xiangyun Tunnel in Yunnan Province, China. In the investigation stage, the engineering geological and hydrogeological conditions were analyzed to recognize high-risk sections. In the construction stage, the “tunnel ahead” prospecting scheme was optimized based on the macroscopic geological conditions. Geological mapping of the tunnel, seismic ahead prospecting and transient electromagnetic soundings were employed as well as resistivity models to image potential adverse conditions. Horizontal drilling and tunnel excavation records verified the geophysical predictions and interpretations.

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