Effects of Karst Cave Shape on the Stability and Minimum
Sep 09, 2021 · This paper focused on the effects of karst cave shape on the stability and minimum safety thickness of tunnel surrounding rock. First, the 3D water-filled karst cave and tunnel models were established, and the tunnel excavation simulation under the different height–span ratios of the karst cave was carried out.
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Evaluation of hydrogeological impact of tunnel …
Evaluation of the Influence Caused by Tunnel Construction
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Study on the Evaluation System of Negative Effects on
Abstract： More and more tunnels will be constructed in karst area to raise road grade and improve the regional traffic environment, along with the rapid development of transportion and technology. However, negative effects on groundwater environment resulted by tunnel construction is not uncommon, and it not only jeopardizes the safety while tunnel constructing, …
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IOP Conference Series: Earth and Environmental Science
The construction and operation of mountain tunnel is closely related to the local water environment. Most of the surface water and groundwater flow into the tunnel through the karst caves, and the external water environment also affects the water inflow in the tunnel. If the investigation of the water
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Evaluation of the Environmental Impact Produced by
In order to evaluate the environmental impact of tunnel construction in karst areas, this document establishes an indicator system consisting of physical geography, geology and hydrogeology as well as tunnel engineers and 19 specific indicators, along with grades and standards for assessment. The weight of each factor is determined using analytic hierarchy process, and …
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Investigation of the impacts of tunnel excavation on karst
The results suggested that negative impacts such as loss of surface and underground water, ground collapse, and house deformation would be posed directly and indirectly to the karst groundwater system and its dependent geo-environment as the result of groundwater level drawdown by tunnel excavation.
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Stormwater Design Guidelines for Karst Terrain
Developers need to undertake a preliminary site investigation prior to any design work for projects or building in areas known to be prone to karst. The level of investigation depends on the probability of karst being present and the local regulatory requirements. The scope of the preliminary site investigation involves analysis of
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IOP Conference Series: Earth and Environmental Science
Jul 01, 2020 · A review of the effects of tunnel excavation on the hydrology, ecology, and environment in karst areas: Current status, challenges, and perspectives. Due to a lack of awareness of environmental protection at the beginning of tunnel excavation and the unique ecological vulnerability of karst areas, tunnel excavation is beginning to have increasingly …
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Influence of deep excavation on adjacent bridge piles
Jun 07, 2021 · This study investigates the disturbance of bridge piles caused by the adjacent deep excavation of a metro station in Guangzhou while considering the existence of underlying karst caverns. Ground treatment was adopted to reduce the effects of the deep excavation on the surrounding environment, including metro jet system (MJS) technology and karst treatment. …
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Investigation of the impacts of tunnel excavation on karst
· May 01, 2021 · However, karst groundwater systems would be greatly affected by the huge water drainage during the tunnel construction (Li et al. 2021), and this kind of negative effects has increased greatly in scale, especially in the karst widespread region like southwestern China (Li et al. 2016), while karst groundwater is significantly crucial to the water …
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However, this is on the assumption that the tunnels are
6.3.2 only deals with the impact of tunnel construction and does not address permanent changes. 6.3.3 to 6.3.5 deal with cross passage construction. As such as these are between the two tunnels, the risks of changing flows are lower. 6.3.6 to 6.3.12 consider the impacts of constructing the tunnels.
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A review of the effects of tunnel excavation on the
Abstract. Due to a lack of awareness of environmental protection at the beginning of tunnel excavation and the unique ecological vulnerability of karst areas, tunnel excavation is beginning to have increasingly serious negative effects on the ecological environments in karst areas, leading to challenges related to regional water resources and ecological security.
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Underground Construction and Ground Movement | Proceedings
The section on engineering issues in karst and ground subsidence addresses investigation, construction and design issues in karst terrain and ground subsidence due to withdrawal of fluids. The tunneling and underground construction section covers topics such as box culverts, shield tunnels and interactions between tunnels and other underground
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Karst Geological Resources and INDOT Construction
Karst Geological Resources and INDOT Construction Page 3 I. Introduction Karst is a landscape feature that is formed by the dissolution of a layer or layers of soluble rock by acidic water. The two types of soluble rock found in the karst regions of Indiana are limestone and dolomite.
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Numerical investigation on the mechanical behaviour of
underground opening such as a natural karst cavity or man-made tunnel and/or culvert (Soliman et al., 2018a; Tien, 1996). It is postulated that the deformations around caverns are similar to those in tunnel problems. Schmidt (1969) suggested that a settlement trough takes place at the ground surface after tunnel construction
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[PDF] A review of the effects of tunnel excavation on the
Abstract Due to a lack of awareness of environmental protection at the beginning of tunnel excavation and the unique ecological vulnerability of karst areas, tunnel excavation is beginning to have increasingly serious negative effects on the ecological environments in karst areas, leading to challenges related to regional water resources and ecological security.
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Site Characterization for Geotechnical Projects in Karst
May 03, 2021 · Karst impacts geotechnical engineering projects in several ways: an increased risk for ground and structure settlement, and sinkhole development, both during and after construction; and there are often complicated structure foundation design and installation requirements due to variable rock depth and conditions.
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Tunnel Prenj | PDF | Tunnel | Hydrogeology
Tunnel Prenj. Challenges of designing and construction of long tunnel Workshop. Sarajevo 25.10.2019 Agenda • General introduction, specifics of planned tunnel structure • Safety concept + ventilation • Geology + hydrogeology + geological risk management • Coffee break • General tunnelling aspects and approaches NATM/TBM • Procurement • Coffee • Panel discussion • …
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The Dynamic Response of Tunnel through the Karst Cave
More and more construction of tunnel engineering in karst region. Karst influence on tunnel engineering in deformation and instability, it often leading to Partial collapse, impellers, rock fall in the tunnel excavation or after work. For through large Karst cave tunnel, it will give great harm to tunnel, adjacent structures and injuries and consequence is very serious when faced with karst
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Analysis of Hydrogeochemical Characteristics of Tunnel
Following tunnel excavation, which is influenced by hydraulic fracturing and geological structure, a series of hydrochemical reactions occur in the karst aquifer, which has a significant impact on groundwater hydrology and the earth process. Based on five sets of 38 samples collected in the Tongzi Tunnel in 2020 and 2021, the main geochemical processes and water quality …
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