scholarly journals Evaluation of Negative Effect on Groundwater Environment Caused by Weathered Granite Tunnel Construction with Mining Method Based on GIS

2019 ◽  
Vol 330 ◽  
pp. 032093
Author(s):  
Liubing Zhu ◽  
Lingqiang Chen ◽  
Yiheng Pan ◽  
Wenyi Hu ◽  
Ping Li ◽  
...  
Keyword(s):  
Tunnel Construction ◽  
Mining Method ◽  
Weathered Granite ◽  
Groundwater Environment ◽  
Negative Effect

Deformation Monitoring and Data Analysis for Metro Construction with Mining Method in Dalian

2013 ◽  
Vol 353-356 ◽  
pp. 1604-1608
Author(s):  
Guang Bin Bai ◽  
Jie Zhao ◽  
Li Sheng Liu
Keyword(s):  
Data Analysis ◽  
Construction Method ◽  
Deformation Monitoring ◽  
Monitoring Data ◽  
Ground Subsidence ◽  
Tunnel Construction ◽  
Mining Method ◽  
Construction Process ◽  
Subway Tunnel ◽  
The Future

Based on a subway tunnel construction, the construction method was introduced. The ground subsidence, crown settlement and convergence displacement caused by the cut tunnel are monitored during the tunneling construction and the results of monitoring data for them are analyzed. This technology wells to guide the tunnel-entering construction effectively and avoid the tunnel-entering construction process prone to landslides, thus ensuring the safety of the tunnel construction and will guiding the future construction.

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.

Groundwater control and curtain grouting for tunnel construction in completely weathered granite

2017 ◽  
Vol 77 (2) ◽  
pp. 515-531 ◽  
Author(s):  
Jinquan Liu ◽  
Weizhong Chen ◽  
Jingqiang Yuan ◽  
Changjun Li ◽  
Qingyan Zhang ◽  
...  
Keyword(s):  
Tunnel Construction ◽  
Weathered Granite ◽  
Curtain Grouting ◽  
Completely Weathered Granite

The Impact Analysis of Grouting Effects to the Settlement of Subway Tunnel Construction

2011 ◽  
Vol 250-253 ◽  
pp. 1769-1773
Author(s):  
Wen Long Ding ◽  
Tao Liu
Keyword(s):  
Impact Analysis ◽  
Simulation Method ◽  
Fluid Loss ◽  
Tunnel Construction ◽  
Mining Method ◽  
Subway Tunnel ◽  
Excavation Process ◽  
Subway Tunnels ◽  
Surface Settlements ◽  
The Impact

For subway tunnels such as Nanjing Metro II excavated by mining method, one of the most important reinforcement methods for preventing surface settlements is the grouting method. There are many soft and weak surrounding rocks and abundant groundwater in the metro section, so grouting has become a major method in reinforcing the fragmented rocks and soil. But bad grouting support caused by fluid loss in soil and rock often allows uncontrollable settlement. In order to analyze the differences in grouting techniques, combined with the actual excavation process and the contrast of different means of settlement control in a complex section of Metro II, this paper adopts the numerical simulation method of FLAC3D to demonstrate that strict management and proper methods can create good and dependable reinforcement of the unstable surrounding materials.

Numerical Simulation on the Influence of the Groundwater Flow Field during Tunnelling

2012 ◽  
Vol 594-597 ◽  
pp. 1230-1233 ◽  
Author(s):  
Xiao Bing Kang ◽  
Xie Wen Hu ◽  
Huai Qian Xie
Keyword(s):  
Numerical Simulation ◽  
Groundwater Flow ◽  
Water Pressure ◽  
High Water ◽  
Tunnel Construction ◽  
Groundwater Environment ◽  
Western Development ◽  
Geological Conditions ◽  
Sphere Of Influence ◽  
The Impact

With the vigorous development of China's economic construction, especially since the western development, needs of traffic tunnel construction are increasing, a large number of tunnels will be built in the mountainous with deeply buried and high water pressure, it is an urgent problem about research on the groundwater environment and the ecological environment in the tunnel site area causes of tunnel construction. The Songpan County Mounigou tunnel located in the high altitude alpine region, regional and environmental geological conditions are complicated, the strata in the tunnel site area is aquifer, and developed faults fractures and fissures, tunnelling will lead to groundwater dewatering and cause the deterioration of the groundwater environment, Then great collapse, burst mud and water gushing will occur during the tunnel construction due to the enrichment of groundwater in tunnel site. Take a research on numerical simulation of groundwater flow in the tunnel site area, the tunnel excavation will form a larger catchment corridor, the impact is bound to the tunnel site hydrogeological conditions in the sphere of influence may appear to lower the groundwater level, seisensui drawdown or part of the dry, provide the basis for tunnel construction.

Study on the Impact of Tongluoshan Tunnel on Groundwater Environment Based on Hydrochemical Analysis

2011 ◽  
Vol 137 ◽  
pp. 353-356
Author(s):  
Jian Liu ◽  
Dan Liu
Keyword(s):  
Tunnel Construction ◽  
Analysis Method ◽  
Carbonate Aquifer ◽  
Groundwater System ◽  
Hydrochemical Analysis ◽  
Groundwater Environment ◽  
Hydrochemical Data ◽  
Gray Relation Analysis ◽  
Relation Analysis ◽  
The Impact

This study applies gray relation analysis method to make an estimate of the range that influenced by Tongluoshan tunnel construction on groundwater environment, using hydrochemical data of groundwater sampled from tunnel and wells as well as springs. Results calculated reveal that the gray relation grades varies from 0.48 to 0.89 with an average of 0.63 to 0.76, implying that the inflow from tunnel is closely related to the groundwater system which recharges the wells and springs. And an area about 3.5 square kilometers consists of rangeⅠand rangeⅡ, distributing mainly in the carbonate aquifer field around tunnel is inferred as the zone that might be influenced by Tongluoshan tunnel construction. So the wells and springs in these ranges may disappear if a good link existing between the tunnel and aquifers that recharges the wells and springs.

Social Motives Predict Loneliness During a Developmental Transition

2017 ◽  
Vol 76 (4) ◽  
pp. 145-153 ◽  
Author(s):  
Jana Nikitin ◽  
Alexandra M. Freund
Keyword(s):  
Social Relationships ◽  
Well Being ◽  
Social Avoidance ◽  
Social Approach ◽  
Social Motives ◽  
Developmental Transitions ◽  
Avoidance Motivation ◽  
Negative Effect ◽  
Low Levels

Abstract. Establishing new social relationships is important for mastering developmental transitions in young adulthood. In a 2-year longitudinal study with four measurement occasions (T1: n = 245, T2: n = 96, T3: n = 103, T4: n = 85), we investigated the role of social motives in college students’ mastery of the transition of moving out of the parental home, using loneliness as an indicator of poor adjustment to the transition. Students with strong social approach motivation reported stable and low levels of loneliness. In contrast, students with strong social avoidance motivation reported high levels of loneliness. However, this effect dissipated relatively quickly as most of the young adults adapted to the transition over a period of several weeks. The present study also provides evidence for an interaction between social approach and social avoidance motives: Social approach motives buffered the negative effect on social well-being of social avoidance motives. These results illustrate the importance of social approach and social avoidance motives and their interplay during developmental transitions.

A Longitudinal Study of Mental Health in Emerging Adults

2014 ◽  
Vol 73 (3) ◽  
pp. 135-141 ◽  
Author(s):  
Monica S. Bachmann ◽  
Hansjörg Znoj ◽  
Katja Haemmerli
Keyword(s):  
Mental Health ◽  
Longitudinal Study ◽  
Emerging Adults ◽  
Poor Mental Health ◽  
Need Satisfaction ◽  
Computer Assisted ◽  
Consistency Model ◽  
Negative Effect ◽  
The Cross ◽  
Health Model

Emerging adulthood is a time of instability. This longitudinal study investigated the relationship between mental health and need satisfaction among emerging adults over a period of five years and focused on gender-specific differences. Two possible causal models were examined: (1) the mental health model, which predicts that incongruence is due to the presence of impaired mental health at an earlier point in time; (2) the consistency model, which predicts that impaired mental health is due to a higher level of incongruence reported at an earlier point in time. Emerging adults (N = 1,017) aged 18–24 completed computer-assisted telephone interviews in 2003 (T1), 2005 (T2), and 2008 (T3). The results indicate that better mental health at T1 predicts a lower level of incongruence two years later (T2), when prior level of incongruence is controlled for. The same cross-lagged effect is shown for T3. However, the cross-lagged paths from incongruence to mental health are marginally associated when prior mental health is controlled for. No gender differences were found in the cross-lagged model. The results support the mental health model and show that incongruence does not have a long-lasting negative effect on mental health. The results highlight the importance of identifying emerging adults with poor mental health early to provide support regarding need satisfaction.

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