The squeezing potential of rock around tunnels: Theory and prediction with examples taken from Japan

Aydan, Ömer; Akagi, T.; Kawamoto, T.

doi:10.1007/bf01032650

Cited by 108 publications

(32 citation statements)

References 5 publications

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“…Then, such applicable range of the factor was discussed by Barla (Barla, 1995). After investigating a considerable quantity of tunnels in soft rock in Japan (Aydan et al, 1996), it was found that the values of bearing factors of the wall rock in tunnels where rock creep was evident are all smaller than 2, which was derived from the typical weak rocks such as marlite, tuff, shale, and pink gritstone, in the depth range of being not more than 400m underground. It is still not known whether this conclusion is available to hard rock in deep mining.…”

Section: Deformation Mechanism Of Rock Mass At Deep Depthmentioning

confidence: 98%

Rock Mechanics and Hazard Control in Deep Mining Engineering in China

2006

Rock Mechanics in Underground Construction

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Recent advances in test and design and computational frameworks of the rock mechanics in mining engineering at great depth are reviewed. It is shown that the main differences for the characteristics of rock mass for deep mining compared with shallow mining are as follows: (1) mining environments, High ground stress, High earth temperature, High karst water pressure, and mining Disturbance (HHHD), (2) five transform features of mechanical characters, (3) four changes of coal mine types and, (4) six typical engineering hazards. With the detailed researches on the nonlinear mechanical characteristics of rock mass in deep mining engineering under complicated geological and mechanical environments, it is shown that the mechanical system is nonlinear for rock mass at depth, but is linear for that at shallow. The classical theory, methods and technology may be partly or most entirely invalid. Accordingly, it is very important to study the basic theory of rock mechanics in deep mining engineering.

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Section: Deformation Mechanism Of Rock Mass At Deep Depthmentioning

confidence: 98%

Rock Mechanics and Hazard Control in Deep Mining Engineering in China

2006

Rock Mechanics in Underground Construction

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“…Also given in Figures 6 are two curves indicating the onset of squeezing conditions according to Aydan et al (1996) and Singh et al (1992), respectively. Points lying above one of these curves should signify the presence of potential squeezing conditions, according to the relevant authors.…”

Section: Results Of the Parametric Studymentioning

confidence: 99%

Pretunnel technology: applications and design methods

et al. 2005

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The Pretunnel technology allows the final or preliminary lining to be built ahead of a tunnel face. The paper shows how this technology has been used for mechanizing the full-face excavation of large tunnels in difficult ground conditions with minimum settlements. Analytical methods are presented for the analysis of the lining both in deep and shallow applications. Fields of applicability are established using results of parametric studies based on the methods proposed.

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“…It is established that all three theories present a similar solution [11,12]. And these findings are very important when designing a shaft.…”

Section: Computational Assessment Of the Faulted Ground Condition Ratmentioning

confidence: 93%

Compatibility of the Support System Consisting of Yielding Elements and Shotcrete Lining in Highly Faulted Grounds

Čebašek¹,

Likar²

2014

JCEA

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The design procedure is made for a mine shaft where permanent underground facilities are interconnected. The highly faulted grounds were identified using empirical and semi-empirical theories. Furthermore, the behavior types are presented. This paper presents excavation and support methods in such ground conditions and the calculations results show that the installation of the yielding elements have an effect on support elements and prevent shotcrete damage during the curing stage. Different numerical analyses carried out showed that, with the yielding elements installed, the total displacements increase but the final axial force reduces, and therefore, the characteristic compressive strength of shotcrete is not exceeded. The calculation results of ground loads and displacements on the designed support system are presented with a 3D numerical geo-mechanical model adopted for highly faulted ground surrounding deeper complex underground structures.

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The squeezing potential of rock around tunnels: Theory and prediction with examples taken from Japan

Cited by 108 publications

References 5 publications

Rock Mechanics and Hazard Control in Deep Mining Engineering in China

Rock Mechanics and Hazard Control in Deep Mining Engineering in China

Pretunnel technology: applications and design methods

Compatibility of the Support System Consisting of Yielding Elements and Shotcrete Lining in Highly Faulted Grounds

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