scholarly journals Pretreatment for Tunnel Karst Cave during Excavation: A Case Study of Guangxi, China

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Junjie Li ◽  
Qiunan Chen ◽  
Xiaocheng Huang ◽  
Gen Zou ◽  
Jiazheng Deng
Keyword(s):  
Water Inrush ◽  
General Term ◽  
Tunnel Construction ◽  
Tunnel Face ◽  
Treatment Scheme ◽  
Soluble Rock ◽  
Initial Support ◽  
Karst Landscapes ◽  
Optimized Treatment

Karst landscape is a general term for earth surfaces and underground patterns that have been formed by the dissolution of soluble rock. Karst landscapes are widely distributed throughout China—particularly in the Guangxi and Guangdong provinces. The main features of karst landscapes are typically reflected in karst caverns, sinkholes, and other geographical phenomena. During tunnel construction in karst areas, various forms of karst caverns may appear on the construction route, and they can cause hazards—such as water inrush and collapse—during tunnel construction. These hazards affect the tunnel construction process. As such, it is necessary to propose a treatment for karst caverns. In this work, a case study of the tunnels on the Hechi-Baise expressway is presented. A comprehensive pretreatment method suitable for this tunnel is proposed. On the premise of prioritizing the safety and timeline of construction, an optimized treatment scheme for the karst caverns of Hebai tunnel is followed. The optimized treatment scheme primarily includes calculation of safe thickness of tunnel face, strengthening the initial support and increasing the thickness of the second lining, increasing the reserved deformation, and grouting. The proposed scheme achieved favorable results in the treatment of a karst cavern in the Hebai tunnels.

A CASE STUDY FOR EXAMINATION OF EFFECTIVENESS OF THE SAFEGUARDING SUPPORTIVE SYSTEM AT A TUNNEL CONSTRUCTION SITE

2019 ◽  
Vol 75 (2) ◽  
pp. I_99-I_107
Author(s):  
Shoken SHIMIZU ◽  
Junichiro YONETAKE ◽  
Takahiko SHOBU ◽  
Makoto IMAI ◽  
Shinichi YAMAMOTO ◽  
...  
Keyword(s):  
Tunnel Construction ◽  
Construction Site

Soil-water inrush induced shield tunnel lining damage and its stabilization: A case study

2020 ◽  
Vol 97 ◽  
pp. 103290 ◽  
Author(s):  
Linchong Huang ◽  
Jianjun Ma ◽  
Mingfeng Lei ◽  
Linghui Liu ◽  
Yuexiang Lin ◽  
...  
Keyword(s):  
Soil Water ◽  
Water Inrush ◽  
Tunnel Lining ◽  
Shield Tunnel

scholarly journals Comparison between electrical resistivity tomography and tunnel seismic prediction 303 methods for detecting the water zone ahead of the tunnel face: A case study

2020 ◽  
Vol 12 (1) ◽  
pp. 1094-1104
Author(s):  
Nima Dastanboo ◽  
Xiao-Qing Li ◽  
Hamed Gharibdoost
Keyword(s):  
Electrical Resistivity ◽  
Electrical Resistivity Tomography ◽  
Geological Structure ◽  
Rock Properties ◽  
Electrical Tomography ◽  
Tunnel Face ◽  
Resistivity Tomography ◽  
Geological Conditions ◽  
Seismic Prediction

AbstractIn deep tunnels with hydro-geological conditions, it is paramount to investigate the geological structure of the region before excavating a tunnel; otherwise, unanticipated accidents may cause serious damage and delay the project. The purpose of this study is to investigate the geological properties ahead of a tunnel face using electrical resistivity tomography (ERT) and tunnel seismic prediction (TSP) methods. During construction of the Nosoud Tunnel located in western Iran, ERT and TSP 303 methods were employed to predict geological conditions ahead of the tunnel face. In this article, the results of applying these methods are discussed. In this case, we have compared the results of the ERT method with those of the TSP 303 method. This work utilizes seismic methods and electrical tomography as two geophysical techniques are able to detect rock properties ahead of a tunnel face. This study shows that although the results of these two methods are in good agreement with each other, the results of TSP 303 are more accurate and higher quality. Also, we believe that using another geophysical method, in addition to TSP 303, could be helpful in making decisions in support of excavation, especially in complicated geological conditions.

The Application of Geological Radar in Forecasting the Adverse Geological in Metamorphic Rock Area Tunnel Construction

2012 ◽  
Vol 531 ◽  
pp. 543-546
Author(s):  
Jiang Tao Xia ◽  
Cheng Zhong Yang ◽  
Shu Fang Wang
Keyword(s):  
Moisture Content ◽  
Metamorphic Rock ◽  
Water Status ◽  
Tunnel Construction ◽  
Construction Process ◽  
Tunnel Face ◽  
Geological Phenomenon ◽  
Zone Water ◽  
Bedding Joint

Accurately surveying out the fault, facture zone, water status and other bad geological phenomenon is the key problems for safety and quality in tunnel construction. Based on the different dielectric electrical differences in characteristics, applying geological radar detected the adverse geological in front of the tunnel face and analyzed. The results show the rock in front of tunnel face is broken, the bedding joint is developed, and there is jointed intensive moisture content with the local rich water. In construction process, the support should be strengthened, excavation method should be adjusted)

Emission transition of greenhouse gases with the surrounding rock weakened – A case study of tunnel construction

2019 ◽  
Vol 209 ◽  
pp. 169-179 ◽  
Author(s):  
Jianfeng Xu ◽  
Chun Guo ◽  
Xiaofeng Chen ◽  
Zhenhua Zhang ◽  
Lu Yang ◽  
...  
Keyword(s):  
Greenhouse Gases ◽  
Surrounding Rock ◽  
Tunnel Construction ◽  
Emission Transition

scholarly journals Correction to: A failure case study of tunnel water inrush source identified by statistical analysis model

2021 ◽  
Vol 14 (20) ◽  
Author(s):  
Li-Gang Yuan ◽  
Xiao-Li Li ◽  
Xin Li ◽  
Yi-Lin Yu ◽  
Li-Guang Chen ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Water Inrush ◽  
Analysis Model

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.

Risk Evaluation of Bed-Separation Water Inrush: A Case Study in the Yangliu Coal Mine, China

2018 ◽  
Vol 37 (2) ◽  
pp. 288-299 ◽  
Author(s):  
Qiuyu Lu ◽  
Xiaoqin Li ◽  
Wenping Li ◽  
Wei Chen ◽  
Luanfei Li ◽  
...  
Keyword(s):  
Coal Mine ◽  
Risk Evaluation ◽  
Water Inrush ◽  
Bed Separation
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