Research on waterproofing and drainage optimization scheme for karst tunnel lining in water-rich areas

Zhao, Dongping; Fan, Haobo; Jia, Lingli; Song, Yingjie

doi:10.1007/s12665-021-09466-0

Cited by 20 publications

(12 citation statements)

References 23 publications

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“…Through numerical simulation and model testing, three optimised waterproofing and drainage schemes were studied, the results showed that, when conventional waterproofing and drainage schemes are adopted for water-rich karst tunnels, the drainage system cannot effectively reduce the water pressure at the inverted arch of the tunnel. When a longitudinal blind drainage pipe was added at the bottom of the inverted arch, the reduction rate reached 84% and when the central drainage ditch was set at the bottom of the inverted arch, it increased to 96% 27 . Proposed a new concept for a drainage and pressure reduction system at the bottom of a railway tunnel, which can efficiently discharge the accumulated water at the bottom of the tunnel and achieve the goal of reducing water pressure 28 .…”

Section: Introductionmentioning

confidence: 99%

Study on drainage mode and anti-clogging performance of new waterproofing and drainage system in a tunnel

Zhang

Liu

Chen

et al. 2023

Sci Rep

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With an increase in tunnel construction and retention, traditional waterproofing and drainage systems have been unable to meet the needs of tunnels in heavy rainfall areas, and disasters such as tunnel lining cracking, leakage, and even collapse, occur frequently. In order to ensure the safe operation and maintenance of tunnels, this paper analyses the characteristics of the traditional waterproofing and drainage system, and puts forward a new drainage structure through numerical simulation and indoor testing. This structure removes the circular drainage blind pipe and adds a convex shell drainage plate between the waterproof board and the secondary lining. The research shows that the new drainage system greatly decreases the water pressure in the easily blocked area of the drainage structure. With the special surface discharge model, the external water pressure of the lining far away from the blocked area can quickly fall back to the normal level. In addition, the drainage capacity of different waterproof and drainage boards is different. With an increase in support pressure, the drainage capacity decreases; the geotextile decreases the most, followed by the capillary drainage board and then the convex shell drainage board. At the same time, after the muddy water drainage test of the three materials, it is found that the convex shell type drainage plate has the best anti-sludge performance. The research in this paper provides a beneficial attempt for the design of waterproofing and drainage structure of a water-rich karst tunnel, and provides a guarantee for the safe operation and maintenance of the tunnel.

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Section: Introductionmentioning

confidence: 99%

Study on drainage mode and anti-clogging performance of new waterproofing and drainage system in a tunnel

Zhang

Liu

Chen

et al. 2023

Sci Rep

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“…Therefore, it is crucial to eliminate how to economically and effectively solve diseases such as high-water pressure causing damage to the above tunnel lining structure. At present, there are many ways to reduce the lining disease, among which an effective and e cient anti-drainage system is currently the mainstream way to reduce the pressure of the tunnel [9].…”

Section: Introductionmentioning

confidence: 99%

FEM analysis of a new three-way drainage and pressure reduction system for road tunnels

Teng

Liu

Mei

et al. 2023

Preprint

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For the water-rich area tunnel elevation arch in the high-water pressure often causes elevation arch cracking and leakage, bulging and other disasters. When the drainage system is not designed properly, such disasters occur more frequently, and conventional road tunnel drainage cannot effectively reduce the water pressure at the elevation arch. Therefore, this paper proposes a new concept of "three-way drainage". The three-way drainage system is based on the conventional drainage system with a new drainage inlet at the elevation arch. On this basis, a series of numerical simulation studies are conducted to verify the pressure-reducing performance of the three-way drainage system on the lining. After demonstration and analysis, the three-way drainage concept can not only effectively reduce the water pressure at the elevation arch of the tunnel, but also have a significant effect on the overall drainage effect of the tunnel. The factors affecting the performance of the three-way drainage system are discussed by varying the model parameters. It was found that the hydraulic conduction coefficient of the surrounding rock and initial support, the number of reverse diversion holes in the elevation arch, the change in head height and the change in secondary lining parameters all had a significant effect on the water pressure outside the tunnel.

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“…Xu et al [10] used an iterative algorithm to determine the free surface, the author simplified the drainage hole as a straight line to simulate the function of the drainage hole and analyze the influence of drainage system on the seepage field. Zhao et al [11] used numerical simulation and model test to study three waterproof and drainage optimization schemes, and analyzed the influence of different locations of drainage ditch on the external water pressure of the lining structure. In summary, field scholars mostly use numerical calculation and model test methods to study the drainage process of drainage holes and the variation laws of the seepage field, but few of them have concerned about the influence of the drainage capacity of drainage system on the external water pressure of the lining structure.…”

Section: Introductionmentioning

confidence: 99%

Application of Drainage Technique to Water Diversion Tunnels in Water-Rich Karst Area

Ye¹,

Wang²,

Feng³

2022

IJHT

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In water-rich karst area, the lining structure of diversion tunnels is prone to cracking and gushing water problems under high water pressure, so water drainage design is often adopted for these diversion tunnels, that is, to drill holes on the lining structure and install drainage equipment to lower the external water pressure of the lining, therefore, accurately calculating the external water pressure of the lining is a very important work for the safety of the lining structure of tunnels. Based on the method of equivalent permeability coefficient, this paper regarded the drainage capacity of drainage equipment installed on the lining and the permeability of lining itself as a whole, and used the virtual equivalent permeability coefficient of the lining to describe it; then, this paper proposed a method for determining the equivalent permeability coefficient of lining and used it to analyze the drainage effect. Main conclusions of this paper are: 1) By designing tests for the drainage model of the tunnel drainage equipment and theoretically analyzing the seepage field of hydraulic tunnel, the equivalent permeability coefficient of the lining was determined and its accuracy was verified via numerical calculation; 2) Analytical calculation results and numerical simulation results of the tunnel were analyzed, and their conclusions about the effect of drainage capacity on the external water pressure of the lining were consistent; 3) The tunnel drainage design is an effective measure to reduce the external water pressure of the lining, the pressure reduction effect is obvious when k<1×10 -6 , and the groundwater level around the tunnel could be reduced at the same time. This paper provides a useful evidence for the design of high-pressure water diversion tunnels.

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Research on waterproofing and drainage optimization scheme for karst tunnel lining in water-rich areas

Cited by 20 publications

References 23 publications

Study on drainage mode and anti-clogging performance of new waterproofing and drainage system in a tunnel

Study on drainage mode and anti-clogging performance of new waterproofing and drainage system in a tunnel

FEM analysis of a new three-way drainage and pressure reduction system for road tunnels

Application of Drainage Technique to Water Diversion Tunnels in Water-Rich Karst Area

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