Roof stability in flat-ceiling deep rock cavities and tunnels

Steel-lined Pressure Tunnels and Shafts in Anisotropic Rock

For the design of steel-lined pressure tunnels and shafts in anisotropic rock, it is common practice to assume for the computation that the system stands in isotropic medium with the lowest stiffness measured in situ. In this paper, stresses and displacements in the steel liner of a particular steel-lined pressure tunnel are numerically assessed taking into account the anisotropic behavior of t...

assessing political stability and instability in central asia and caucasus; case study, azerbaijan and kyrgyzstan

منطقه ی آسیای مرکزی وقفقاز به عنوان منطقه ای تاریخی و به دلیل دارا بودن ذخایر عظیم هیدرو کربنی از اهمیت ویژه ای برخوردار است. کشورهای این منطقه از عوامل عمده ی بی ثباتی نظیر عوامل جغرافیایی، اقتصادی، امنیتی، اجتماعی و سیاسی رنج می برند. پس از فروپاشی اتحاد جماهیر شوروی کشورهای منطقه از نعمت استقلال ناخواسته ای برخوردار شدند که مشکلات فوق را برای آن ها چندین برابر می کرد. در این روند برخی از این...

Critical stability number in rock lined channels

Numerical analysis of tunnels and deep excavations

This report covers 33 papers submitted to the session Numerical Analysis of Tunnels and Deep Excavations. The majority of papers (26) addresses aspects related to tunnelling, both NATM and bored tunnels. As compared to previous conferences analysis of interaction between tunnel construction and surrounding structures such as buildings and pile foundations seems to have become more important. On...

Roof Tunnel Stability by Wedge Analysis

A jointed rock mass presents a more complex design problem than the other rock masses. The complexity arises from the number (greater than two) of joint sets which define the degree of discontinuity of medium.  The condition that arises in these types of rock masses is the generation of discrete rock blocks, of various geometries. They defined by the natural fracture surfaces and the excavation...