Stress and strain analysis during the Sleme tunnel excavation

Hrestak, Tomislav; Jaguljnjak-Lazarević, Antonia; Frgić, Lidija

doi:10.17559/tv-20140530103847

Cited by 4 publications

(3 citation statements)

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“…Hrestak et al analysed the distribution of stresses and strains during the portal section excavation for the right tube of the Sleme Tunnel by the Finite Element Method (FEM). The results verified that for this particular case a sufficiently safe and costefficient construction technology was applied [15]. Li et al researched the effects of thin coal seam on the roof of roadways with different thicknesses and positions.…”

Section: Introductionsupporting

confidence: 69%

Distribution characteristics analysis of pressure-arch in horizontal stratified rocks under coal mining conditions

Wang

et al. 2015

Teh. vjesn.

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Original scientific paper The criteria of separation and dislocation of the layered roof in mining are put forward through the simplified mechanical model with weak inter-layers. Considering five different variables, namely the number of layers, the distance from the weak inter-layers to the mine opening, the thickness of the weak inter-layers, the lateral pressure coefficient and the spacing of the bedding planes, the distribution characteristics of the pressure-arch in the horizontal stratified rocks are analyzed during coal mining using FLAC3D. The results show that the newly appeared pressure-arch is composed of the original pressure-arch in each layer and the pressure-arch shape being affected by the weak layer in the surrounding rock of the mine opening. As the distance between the inter-layers and the coal seam increases, the effect on the pressure-arch is reduced gradually. The thinner inter-layers produce greater impact on the pressure-arch. The lateral pressure coefficient has a great influence on the pressure-arch and a stable pressure-arch could only be formed when the lateral pressure coefficient is in a suitable range. Keywords: numerical analysis; pressure-arch; stratified rock; weak inter-layers Analiza karakteristika raspodjele tlaka stropa u horizontalno slojevitim stijenama u uvjetima iskapanja ugljenaIzvorni znanstveni članak Predlažu se kriteriji za odvajanje i premještanje slojevitog nadsvođa u rudarstvu primjenom pojednostavljenog mehaničkog modela sa slabim međuslojevima. Uz razmatranje pet različitih varijabli, naime broja slojeva, razmaka od slabih među-slojeva do otvora rudnika, debljine slabih međuslojeva, lateralnog koeficijenta tlaka i međusobnog razmaka površina laminacije, analiziraju se karakteristike raspodjele tlaka stropa u horizontalno slojevitim stijenama tijekom iskapanja ugljena, primjenom FLAC3D. Rezultati pokazuju da se novonastali tlak stropa sastoji od originalnog tlaka stropa u svakom sloju te tlaka konture stropa prouzročenog slabim slojem u okruženju stijene okna rudnika. Kako se povećava razmak između međuslojeva i sloja (žile) ugljena, postepeno se smanjuje utjecaj na tlak stropa. Tanji međuslojevi imaju veći utjecaj na tlak stropa. Lateralni koeficijent tlaka ima veliki utjecaj na tlak stropa te se stabilni tlak stropa može stvoriti jedino kad je lateralni koeficijent tlaka odgovarajućeg raspona.

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Section: Introductionsupporting

confidence: 69%

Distribution characteristics analysis of pressure-arch in horizontal stratified rocks under coal mining conditions

Wang

et al. 2015

Teh. vjesn.

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“…This mostly uses double-line horizontal parallel shield tunneling, which causes a greater amount of settlement and produces a wider settlement trough than single-line shield tunneling. The effects of double-line parallel shield tunneling on underground pipelines (hereinafter referred to simply as pipelines) differ considerably from those of single-line shield tunneling [1], [2], [3]. Therefore, an investigation of the effects of double-line parallel shield tunneling on adjacent pipelines is of great importance.…”

Section: Introductionmentioning

confidence: 99%

Effect of Double - line Parallel Shield Excavation on A djacent Underground Pipelines

Gao¹,

Hu²,

Xing³

et al. 2016

JESTR

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Using a formula for the total settlement of deep soil and the Winkler foundation model, the force model for underground pipelines is simplified to obtain the ultimate bending moments and to calculate the stress and strain due to double parallel shield tunneling construction. The effects of soil conditions, tunnel horizontal spacing L, pipeline material, pipeline depth h and soil loss ratioηl/ηf on the force on an underground pipeline are investigated. The results show that changing the soil conditions and value of L can have a significant effect on the shape and magnitude of the pipeline's ultimate moment curve, although changing the value of h has less of an effect. It is found that the larger the bending stiffness of the pipeline, the larger the distribution range of the ultimate bending moment and its peak value, but there is less of an effect on the shape of the curve. Changes in the ratioηl/ηf have some influence on both the shape of the curve and the values of the bending stiffness of the pipeline.

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“…Urban ground traffic congestion is becoming increasingly serious in China. Tunnels are therefore widely used in order to ease congestion [1], [2], [3]. The construction of shield tunnels will inevitably remold the soil mass and cause settlement of building foundations.…”

Section: Introductionmentioning

confidence: 99%

Calculation of Building Foundation Settlement Caused by Shield Tunnel Construction

Chen¹,

Yu²,

Wei³

et al. 2015

JESTR

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The formation of settlement troughs for the case when there are buildings above a tunnel is different from the case without buildings present on the ground surface during construction of shield tunnels below the ground. By considering the influence of building stiffness, previous studies have calculated the surface of building subsidence during shield construction, but it was assumed that the soil around the tunnel would shrink evenly toward the center and that the focus should be fixed and the foundation stiffness of the building was not considered. The method used in this paper modifies the forward method, by considering a uniform ground movement model for shield tunnels and the foundation stiffness and depth. The calculated values are compared to the measured values, the values of the other method and also values obtained using finite-element simulation. The effects of the equivalent elastic modulus of buildings E 1 , the depth of the tunnel axis from the ground h and the distance between the tunnel axis L to the settlement of foundations are also analyzed. The results show that the values obtained by the present calculation method are more similar to the measured and finite-element simulation values than the values obtained using the other method. The settlement of foundations is found to decrease with increasing E 1 , h and L.

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Stress and strain analysis during the Sleme tunnel excavation

Cited by 4 publications

References 0 publications

Distribution characteristics analysis of pressure-arch in horizontal stratified rocks under coal mining conditions

Distribution characteristics analysis of pressure-arch in horizontal stratified rocks under coal mining conditions

Effect of Double - line Parallel Shield Excavation on A djacent Underground Pipelines

Calculation of Building Foundation Settlement Caused by Shield Tunnel Construction

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