2016
DOI: 10.1016/j.tust.2016.04.004
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An investigation into efficient drainage layouts for the stabilization of tunnel faces in homogeneous ground

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Cited by 32 publications
(7 citation statements)
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“…Advance drainage decreases both the pore pressures and their gradients ahead of the tunnel face, thus improving its stability [9]. The stabilizing effect of drainage is significant, even under the practical limita tions that are imposed by the TBM equipment with re spect to the spacing and number of boreholes [10]; in the present case, boreholes could only be drilled relatively easily in the upper part of the tunnel face ( Figure 2c). In the case of particularly poor ground, advance drainageeither alone ( Figure 5, BC) or in combination with grout ing ( Figure 5, ABC) -allows reductions of operating pres sure, thus widening the feasibility range of open mode operation and reducing the technical risks associated with TBM operation at very high support pressures over long parts of the tunnel.…”
Section: Assessment Of Face Stabilitymentioning
confidence: 78%
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“…Advance drainage decreases both the pore pressures and their gradients ahead of the tunnel face, thus improving its stability [9]. The stabilizing effect of drainage is significant, even under the practical limita tions that are imposed by the TBM equipment with re spect to the spacing and number of boreholes [10]; in the present case, boreholes could only be drilled relatively easily in the upper part of the tunnel face ( Figure 2c). In the case of particularly poor ground, advance drainageeither alone ( Figure 5, BC) or in combination with grout ing ( Figure 5, ABC) -allows reductions of operating pres sure, thus widening the feasibility range of open mode operation and reducing the technical risks associated with TBM operation at very high support pressures over long parts of the tunnel.…”
Section: Assessment Of Face Stabilitymentioning
confidence: 78%
“…5. Slurry or compressed air pressure required for longterm stability as a function of the cohesion with or without advance drainage, calculated according to [10] the latter (at a distance of about 2 m from the working face) and, later, also in the middle and in the rear part of the shield. When the ground establishes contact with the shield by closing the gap, pressure develops upon the shield (Figure 8, upper diagram), which increases shield skin friction and necessitates a higher thrust force.…”
Section: Maximum Slurry Pressures and Maximum Air Pressures For Intmentioning
confidence: 99%
“…Sara Zingg. et al [7,8] studied the effectiveness of various advanced drainage schemes (including drainage through an external parallel adit) on the stabilization of tunnel faces. Several other scholars have also focused on advanced drainage's effect on tunnel face stability [9,10].…”
Section: Introductionmentioning
confidence: 99%
“…This interaction is particularly complex and largely affects the contribution of the pipe roof to the reduction of the soil settlement as well as to the improvement of the excavation stability. Studies using limit equilibrium or limit analysis methods were used for the analysis of the tunnel face stability [2][3][4]. Experimental studies were also conducted to explore excavation stabilities [5].…”
Section: Introductionmentioning
confidence: 99%