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.

Formation Mechanism and Characteristics of the Bei’an to Heihe Expressway K177 Landslide

2011 ◽  
Vol 422 ◽  
pp. 663-668 ◽  
Author(s):  
Wei Shan ◽  
Hua Jiang ◽  
Gao Hang Cui
Keyword(s):  
Formation Mechanism ◽  
Atmospheric Precipitation ◽  
Water Source ◽  
Field Investigation ◽  
Anthropogenic Factors ◽  
Freezing And Thawing ◽  
Geological Conditions ◽  
Numerical Simulation Methods ◽  
Slope Rock ◽  
Rock And Soil

Bei'an to Heihe highway is being widen to expressway at present in Heilongjiang province, some sections are located in ancient landslide bodies, influenced by the landform, rainfall, freeze thawing and anthropogenic factors, are in unstable states, bring great difficulties to construction. Took the Bei'an to Heihe expressway expansion project K177 landslide as the research object, employed the field investigation, geological drilling, field monitoring, indoor experiment and numerical simulation methods to carry an integrated study on the formation mechanism of the landslide. The research results show that: topographical, geological conditions and the water content change of slope rock and soil is the main reason causing landslide; atmospheric precipitation, seasonal freezing and thawing of the shallow soil and the island permafrost which scattered in the mountain valley melting provide a continued water source for landslide, thermal contraction cracks of slope surface and high permeability of surface rock and soil provide passage for water infiltrating, completely weathered mudstone above the aquifuge which is influenced by infiltration water to be soften forms rupture surface.

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.

scholarly journals Evaluation of the Influence Caused by Tunnel Construction on Groundwater Environment: A Case Study of Tongluoshan Tunnel, China

2015 ◽  
Vol 2015 ◽  
pp. 1-14 ◽  
Author(s):  
Jian Liu ◽  
Dan Liu ◽  
Kai Song
Keyword(s):  
Indicator System ◽  
Field Investigation ◽  
Assessment Method ◽  
Tunnel Construction ◽  
Moderate Degree ◽  
Tunnel Excavation ◽  
Construction Period ◽  
Environmental Investigation ◽  
Groundwater Environment

Problems related to water inflow during tunnel construction are challenging to designers, workers, and management departments, as they can threaten tunneling project from safety, time, and economic aspects. Identifying the impacts on groundwater environment resulting from tunnel drainage and making a correct assessment before tunnel construction is essential to better understand troubles that would be encountered during tunnel excavation and helpful to adopt appropriate countermeasures to minimize the influences. This study presents an indicator system and quantifies each indicator of Tongluoshan tunnel, which is located in southwest China with a length of 5.2 km and mainly passes through carbonate rocks and sandstones, based on field investigation and related technological reports. Then, an evaluation is made using fuzzy comprehensive assessment method, with a result showing that it had influenced the local groundwater environment at a moderate degree. Information fed back from environmental investigation and hydrologic monitoring carried out during the main construction period proves the evaluation, as the flow of some springs and streams located beside the tunnel route was found experiencing an apparent decline.

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.

The Application and Construction of Light Steel Roof Truss in the Hydropower Station Tunnel

2012 ◽  
Vol 538-541 ◽  
pp. 3160-3164
Author(s):  
Xiao Ping Wang ◽  
Qi Tao Zhan ◽  
Jie Xu
Keyword(s):  
Operation Time ◽  
Field Investigation ◽  
Installation Space ◽  
Hydropower Station ◽  
Tunnel Construction ◽  
Space And Time ◽  
Power House ◽  
Assembly Area ◽  
Roof Truss ◽  
Steel Roof

The hydropower station tunnel construction is crossover operation and environment is poor. Installation space and time are limited. The paper introduces corresponding measures and installation method.Through field investigation and vast demonstration, using electric hoist and little bridge machine in equipment assembly area can avoid the effect to power house equipment installation and reduce crossover operation time. Using installation platform on the little bridge in hydro-generator area can reduce the use of the little bridge machine and improve the installation efficiency .

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