4 results
Search Results
2. The Interaction Between Shield, Ground and Tunnel Support in TBM Tunnelling Through Squeezing Ground.
- Author
-
Ramoni, M. and Anagnostou, G.
- Subjects
TUNNEL design & construction ,ROCK mechanics ,GROUND control (Mining) ,MATHEMATICAL analysis ,BOUNDARY value problems - Abstract
When planning a TBM drive in squeezing ground, the tunnelling engineer faces a complex problem involving a number of conflicting factors. In this respect, numerical analyses represent a helpful decision aid as they provide a quantitative assessment of the effects of key parameters. The present paper investigates the interaction between the shield, ground and tunnel support by means of computational analysis. Emphasis is placed on the boundary condition, which is applied to model the interface between the ground and the shield or tunnel support. The paper also discusses two cases, which illustrate different methodical approaches applied to the assessment of a TBM drive in squeezing ground. The first case history-the Uluabat Tunnel (Turkey)-mainly involves the investigation of TBM design measures aimed at reducing the risk of shield jamming. The second case history-the Faido Section of the Gotthard Base Tunnel (Switzerland)-deals with different types of tunnel support installed behind a gripper TBM. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
3. Inclinodeformeter pressure measurements in creeping landslides: analytical solutions and field applications.
- Author
-
SCHWAGER, M.V. and PUZRIN, A.M.
- Subjects
LANDSLIDES ,NUMERICAL analysis ,EARTH pressure ,BOUNDARY value problems ,INCLINOMETER - Abstract
The paper derives analytical solutions for deformation of viscoelastic pipe in elastic soil under far-field principal stress increments. These solutions are validated in laboratory tests and numerical analysis and provide the basis for back-calculation of earth pressure increments from measured changes in shape of an inclinometer pipe cross-section using inclinodeformeter (IDM) technology. The procedure has been applied to back-calculating earth pressure changes and soil stiffness in three creeping landslides in Switzerland, which are similar in size but have a range of different boundary conditions and displacement rate fields. In these applications, pressure increments of less than 1 kPa could be reliably back-calculated allowing for identification of compression and extension zones, as well as yielding and failure of soil in the landslides under study, confirming the previously developed models of the landslide mechanisms and suggesting that IDM pressure measurements could serve as a reliable tool for analysis and monitoring of creeping landslides. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
4. Yukawa unification predictions for the LHC.
- Author
-
Anandakrishnan, Archana, Raby, Stuart, and Wingerter, Akin
- Subjects
- *
YUKAWA interactions , *LARGE Hadron Collider , *GAUGE field theory , *BOUNDARY value problems , *GLUINO , *SUPERSYMMETRY , *STANDARD model (Nuclear physics) - Abstract
This paper is divided into two parts. In the first part we analyze the consequences, for the LHC, of gauge and third-family Yukawa coupling unification with a particular set of boundary conditions defined at the grand unification scale. We perform a global Χ² analysis including the observables Mw, Mz, GF, ɑem-1, ɑs(Mz), M1 mb(mb), MT, BR(B --> Xs-γ), BR(Sγ → μ+μ-), and Mh. The fit is performed in the minimal supersymmetric Standard Model in terms of nine grand unification-scale parameters, while tanβ and μ are fixed at the weak scale. Good fits suggest an upper bound on the gluino mass, Mg ≤ 2 TeV. This constraint comes predominantly from fitting the bottom-quark and Higgs masses (assuming a 125 GeV Higgs). Gluinos should be visible at the LHC in the 14 TeV run but they cannot be described by the typical simplified models. This is because the branching ratios for g-- ttx1.20 bbx1.20 tbx1.2- btX1.2+ gX1,2 3,40 are comparable. Top squarks and sbottoms may also be visible. Charginos and neutralinos can be light, with the lightest supersymmetric particle predominantly bino-like. In the second part of the paper we analyze a complete three-family model and discuss the quality of the global x² fits and the differences between the third-family analysis and the full three-family analysis for overlapping observ-ables. We note that the light Higgs in our model couples to matter like the Standard Model Higgs. Any deviation from this would rule out this model. [ABSTRACT FROM AUTHOR]
- Published
- 2013
- Full Text
- View/download PDF
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.