2009
DOI: 10.1016/j.tust.2008.05.006
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Effects of rock pillar width on the excavation behavior of parallel tunnels

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Cited by 43 publications
(11 citation statements)
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“…Similar research with 3D-FE analyses targeted to twin mechanized tunneling interaction in soft ground is presented by Do et al Chang et al (1996), based on a case study of twin tunnels in Taiwan, propose a simpli ed method to estimate the safety factor for the pillar and qualitatively analyze measures capable of mitigating the interaction and preventing potential failures. Chen et al (2009) investigate the effects of the rockmass pillar width on the behavior of three and four parallel-branch circular and non-circular tunnels for a case study in Taiwan, via 2D-FE analyses, de ning W/D=2-4, as the critical pillar width to tunnel diameter ratio. Liu et al (2008) examine via 3D-FE analyses the interaction between non-circular, shallow, conventionally constructed tunnels in soft ground for a case study in Sydney, pointing out that the advance of the new tunnel signi cantly affects the existing, with the extent of the in uence depending on the relative distance between the tunnels.…”
Section: Literature Reviewmentioning
confidence: 99%
“…Similar research with 3D-FE analyses targeted to twin mechanized tunneling interaction in soft ground is presented by Do et al Chang et al (1996), based on a case study of twin tunnels in Taiwan, propose a simpli ed method to estimate the safety factor for the pillar and qualitatively analyze measures capable of mitigating the interaction and preventing potential failures. Chen et al (2009) investigate the effects of the rockmass pillar width on the behavior of three and four parallel-branch circular and non-circular tunnels for a case study in Taiwan, via 2D-FE analyses, de ning W/D=2-4, as the critical pillar width to tunnel diameter ratio. Liu et al (2008) examine via 3D-FE analyses the interaction between non-circular, shallow, conventionally constructed tunnels in soft ground for a case study in Sydney, pointing out that the advance of the new tunnel signi cantly affects the existing, with the extent of the in uence depending on the relative distance between the tunnels.…”
Section: Literature Reviewmentioning
confidence: 99%
“…Mortazavi et al discussed the failure mechanism and studied the influence of geometry and strength parameters on the performance of rock pillar [4]. Chen et al analyzed the width effects of rock pillars in multi-line parallel tunnels and found that the interactions became increasingly obvious with the rock pillar width decrease [5]. Zhang and Goh studied the peak vertical stress in the rock pillar and identified the overlap plastic zones 6.…”
Section: State Of the Artmentioning
confidence: 99%
“…Taking the P-type cross-section tunnel with surrounding rock grade V as an example, the ultimate load on the middle rock pillar can be obtained by using Equation (5). L=4.0 m, a and H are known in the practical engineering.…”
Section: Vertical Stress Calculation Verification Analysismentioning
confidence: 99%
“…Such projects are generally deep-buried tunnels [15,19,20]. e tunnel engineering cross section uses a variety of cross types [21,22]: for example, the Russian cross tunnel uses a doublehole double-layer tunnel type; the Italian-Swiss highway in Milan's two-lane cross tunnel-type runs from horizontal to parallel and cross to vertical parallel; the newly constructed east-west Tozai subway tunnel in Japan uses a line pattern similar to the four-hole twist to intersect the existing Keishin line; the first phase of the Shenzhen subway project, from the Guomao Station to the Old Street Station [23] uses left and right overlapping structure of the line; Shanghai Metro Line 2 adopts the way of crossing up and down when crossing with Line 1 [24]. e vertical clear distance between the top and bottom is about 1 m. e above projects cover the main types of cross structures for proximity projects and more difficult studies such as shallow-buried three-dimensional cross tunnels with very large cross sections.…”
Section: Introductionmentioning
confidence: 99%