Discrete Numerical Model for Analysis of Earth Pressure Balance Tunnel Excavation

Maynar, Manuel J. Melis; Rodríguez, Luís E.

doi:10.1061/(asce)1090-0241(2005)131:10(1234)

Cited by 132 publications

(28 citation statements)

References 3 publications

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“…For example, more than 410 km subway is in operation beneath London, UK [3], and 293 km beneath Madrid, Spain [4]. Developed regions such as Hong Kong are making good use of their underground space for not only subway tunnels but also other underground caverns [5], which makes it common to have different tunnels or underground spaces overlapping each other at different elevations.…”

Section: Introductionmentioning

confidence: 99%

Numerical Evaluation on Dynamic Response of Existing Underlying Tunnel Induced by Blasting Excavation of a Subway Tunnel

Zhou¹,

Luo²,

Li³

et al. 2017

Shock and Vibration

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In Southwest China, most regions are mountainous, where traditional drill-and-blast method is adopted to excavate relatively harder rocks. However, blasting would cause vibration to adjacent structures and might result in damage or even failure. This paper considers a case where subway tunnel is overlying an existing railway tunnel, while the excavation requires blasting method. Vibration and stress distribution are calculated via Dynamic Finite Element Method (DFEM) for both full-face excavation and CD method. Result shows that vibration induced by CD method is only 28% of that caused by full-face blasting with same distance. Peak vibration is located on the lining facing the blasting source, while peak tensile stress is on the other side of the contour due to the reflection of stress wave on strata boundary. And peak value of tensile stress induced by full-face blasting is capable of causing lining failure; thus full-face blasting is not suggested within 40 m beyond the underlying tunnel axis. However, CD method has shown much advantage, since blasting within 25 m is also considered safe to the underlying tunnel. But when the blasting source is as near as 12 m within the underlying tunnel, the CD method is no longer safe.

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Section: Introductionmentioning

confidence: 99%

Numerical Evaluation on Dynamic Response of Existing Underlying Tunnel Induced by Blasting Excavation of a Subway Tunnel

Zhou¹,

Luo²,

Li³

et al. 2017

Shock and Vibration

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show abstract

“…The discrete element method is more suitable for studying the influence of shield tunnel construction in discrete medium. Maynar and Rodríguez [13] applied the particle flow code (PFC) method to investigate the thrust and torque of the EPB machine. Chen et al [14] used the PFC method to study the face stability of a shallow shield tunnel in dry sandy ground.…”

Section: Introductionmentioning

confidence: 99%

Impact of shield tunneling on adjacent spread foundation on sandy cobble strata

Fang

Wang

et al. 2014

J. Mod. Transport.

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The section of shield tunnel of the Chengdu Metro line passes primarily through sandy cobble strata. There are many buildings with spread foundations along the lines. Shield tunnel construction will disturb the ground, causing displacement or stress to adjacent spread foundations. Based on the similarity theory, a laboratory model test of shield tunnel driving was carried out to study the influence of shield tunnel excavation on the displacement of adjacent spread foundation. The results show that foundation closer to the tunnel has greater displacement or settlement than that further away. The horizontal displacement is small and is influenced greatly by the cutting face. The displacement along the machine driving direction is bigger and is significantly affected by the thrust force. Settlement occurs primarily when shield machine passes close to the foundation and is the greatest at that time. Uneven settlement at the bottom of the spread foundation reaches a maximum after the excavation ends. In a numerical simulation, a particle flow model was constructed to study the impact of shield tunnel excavation on the stresses in the ground. The model showed stress concentration at the bottom of the spread foundation. With the increasing ground loss ratio, a loose area appears in the tunnel dome where the contact force dropped. Above the loose area, the contact force increases, forming an archshaped soil area which prevents the loose area from expanding to the ground surface. The excavation also changed the pressure distribution around spread foundation.

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“…The first one is related to a possible instability of the pressurized face, and the second one is related to ground movements around the excavation. The first problem is solved by the application of a retaining fluid pressure on the tunnel face, and the value of this pressure may be computed with analytical or numerical models [3,14,15,18,20,22,23,33]. The second problem has also been studied by several authors [2, 4-6, 11, 12, 19, 21, 26, 27, 30] and it will be investigated in depth in the present paper.…”

Section: Introductionmentioning

confidence: 99%

Probabilistic analyses of tunneling-induced ground movements

2012

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Tunneling-induced ground movements are investigated in this paper using both deterministic and probabilistic analyses. The deterministic model is based on three-dimensional (3D) numerical simulations using the commercial code FLAC 3D . This model attempts to reproduce some major phenomena during a typical slurryshield tunnel excavation (ground movements due to the applied face pressure, the overcutting, the shield conicity, the annular void behind the shield, and the grout injection in this void). Moreover, the model provides useful information about the nature and magnitude of the soil movements at the ground surface. A probabilistic study is then undertaken in order to evaluate the impact of the variability of several input variables on the ground movements. An efficient probabilistic method called CSRSM is used to assess this uncertainty propagation. In a last section, the output variables of the model are linked to failure criteria. This allows one to determine probabilities of failure, depending on the probabilistic properties of the input variables and on the admissible threshold of each criterion.

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Discrete Numerical Model for Analysis of Earth Pressure Balance Tunnel Excavation

Cited by 132 publications

References 3 publications

Numerical Evaluation on Dynamic Response of Existing Underlying Tunnel Induced by Blasting Excavation of a Subway Tunnel

Numerical Evaluation on Dynamic Response of Existing Underlying Tunnel Induced by Blasting Excavation of a Subway Tunnel

Impact of shield tunneling on adjacent spread foundation on sandy cobble strata

Probabilistic analyses of tunneling-induced ground movements

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