Subsurface exploration and transient pressure testing from a deep tunnel in fractured and karstified limestones (Lötschberg Base Tunnel, Switzerland)

Pesendorfer, Marc; Loew, Simon

doi:10.1016/j.ijrmms.2009.09.013

Cited by 28 publications

(5 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…• Infiltration or exfiltration at the outcrop 97 , where water is injected or infiltrated or removed from the outcrop (n = 4), • Water inflow from the fault zones to tunnels 30,79 (n = 43), • Single borehole tests are the most extensively used methods in fault zones and host rocks (injection, discharge, slug or pulse tests) [98][99][100] (n = 206), • Tidal analysis of the water pressure fluctuations in drillholes as a response to the solid earth tides or ocean tides 101 (n = 10), • Barometric fluctuations in the unsaturated zone to estimate air flow rate along the fault zones 102 (n = 1),…”

Section: Category Of Researchmentioning

confidence: 99%

Multidisciplinary database of permeability of fault zones and surrounding protolith rocks at world-wide sites

Scibek

2020

Sci Data

View full text Add to dashboard Cite

Brittle faults and fault zones are important fluid flow conduits through the upper part of Earth's crust that are involved in many well-known phenomena (e.g. earthquakes, thermal water and gas transport, or water leakage to underground tunnels). the permeability property, or the ability of porous materials to conduct water and gas, is one of the key parameters required in understanding and predicting fluid flow. Although close to a thousand studies have been done, and permeability tested in parts of fault zones, a sytematic summary and database is lacking. this data descriptor is for a multidisciplinary worldwide compilation and review of bulk and matrix permeability of fault zones: 410 datasets, 521 reviewed sites, 379 locations, >10000 publications searched. The review covers studies of faulting processes, geothermal engineering, radioactive waste repositories, groundwater resources, petroleum reservoirs, and underground engineering projects. the objectives are to stimulate the cross-disciplinary data sharing and communication about fault zone hydrogeology, document the biases and strategies for testing of fault zones, and provide the basic statistics of permeability values for models that require these parameters.

show abstract

Section: Category Of Researchmentioning

confidence: 99%

Multidisciplinary database of permeability of fault zones and surrounding protolith rocks at world-wide sites

Scibek

2020

Sci Data

View full text Add to dashboard Cite

show abstract

“…And the rise of discrete fracture network (DFN) technology makes the simulation effect is closer to the practical condition [18][19][20][21]. DEM, combined with theoretical calculation or model test, can be used to predict the hydraulic pressure behind the lining, surrounding rock deformation, and support parameters under different conditions during the design stage [22][23][24][25][26][27][28][29][30], so as to make reasonable support design to reinforce the surrounding rock of the tunnel and avoid the occurrence of disasters [14,[31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Failure Mechanism of Tunnel Surrounding Rock under Different Groundwater Seepage Paths

Wang

Yang

et al. 2021

Geofluids

View full text Add to dashboard Cite

The influence of groundwater on tunnel engineering is very complicated. Due to the complexity of water flow water pressure transfer and uncertain defects in the stratum, all of which are key factors with regard to the design of tunnel engineering. Therefore, the variation of surrounding rock during excavation and the deformation and failure of soft surrounding rock under different seepage paths of underground water after excavation systematically. Experimental results showed that the stress change of surrounding rock caused by tunnel excavation can be divided into 3 stages: stress redistribution, stress adjustment, and stress rebalancing. In the process of water pressure loading, water flow rate is closely related to the experimental phenomenon. The between stable loading water pressure pore water pressure of the tunnel surrounding rock and the distance from the measuring point to the edge of the tunnel obey the exponential function of the decreasing growth gradient. With the increase of loading pressure, the pore water pressure and stress at the top of the tunnel increase, and the coupling of stress field and seepage field on both sides of surrounding rock more and more intense. The failure process of the tunnel can be divided into 6 stages according to the damage degree. The final failure pattern of the surrounding rock of the tunnel is mainly determined by the disturbed area of excavation. The arched failure area and the collapse-through failure area are composed of three regions. The surrounding rock is characterized by a dynamic pressure arch in the process of seepage failure, but it is more prone to collapse failure at low water pressure. The results of this study are the progressive failure mechanism of tunnel under different groundwater seepage paths and would be of great significance to the prevention of long-range disasters.

show abstract

“…It changed the physical and mechanical properties of the surrounding rock and resulted in the change of the stress field and the displacement field [25][26][27][28][29][30][31]. A karst cave and the filling medium will make the construction mechanics more complex and easily cause excessive stress concentration in the surrounding rock, which results in an increase of deformation of the tunnel's surrounding rock [32,33].…”

Section: Introductionmentioning

confidence: 99%

Assessment of a Concealed Karst Cave’s Influence on Karst Tunnel Stability: A Case Study of the Huaguoshan Tunnel, China

Huang

et al. 2018

Sustainability

View full text Add to dashboard Cite

Abstract:In order to assess a concealed karst cave's influence on karst tunnel stability, an assessment model is proposed based on the analytic hierarchy process and a statistical analysis of relevant engineering projects. Major factors are studied and selected as impact factors of the assessment model based on a statistical analysis on a karst cave' s development conditions (karst hydrogeological and engineering geological conditions), construction conditions, and controlling measures. A weight analysis of factors shows that the surrounding rock grade, supporting measurement, formation lithology, unfavorable geology, construction methods, blasting techniques, advanced geological forecast, and groundwater level are the main controlling factors of the tunnel stability when there is a concealed karst cave in the tunnel. Topography and geomorphology, attitude of rocks, monitoring measurement, strata combination, and interlayer fissures are the minor influence factors. Tunnel section shapes, in situ stress, and geological logging are the least important factors. The proposed method is successfully applied to the assessment of a concealed karst cave's influence on the stability of the Huaguoshan Tunnel on the Enshi-Laifeng and Enshi-Qianjiang Expressways. The evaluation result agrees well with the construction site situation. In addition, the result provides good guidance with respect to the implementation of the treatment scheme and effectively avoids accidents in real-time.

show abstract

Subsurface exploration and transient pressure testing from a deep tunnel in fractured and karstified limestones (Lötschberg Base Tunnel, Switzerland)

Cited by 28 publications

References 20 publications

Multidisciplinary database of permeability of fault zones and surrounding protolith rocks at world-wide sites

Multidisciplinary database of permeability of fault zones and surrounding protolith rocks at world-wide sites

Experimental Study on the Failure Mechanism of Tunnel Surrounding Rock under Different Groundwater Seepage Paths

Assessment of a Concealed Karst Cave’s Influence on Karst Tunnel Stability: A Case Study of the Huaguoshan Tunnel, China

Contact Info

Product

Resources

About