scholarly journals Bottom Reinforcement in Braced Excavations: Coupled Analysis and New Method for Basal-Heave Stability Study

2020 ◽  
Vol 43 (2) ◽  
pp. 199-217
Author(s):  
José Leitão Borges ◽  
Rita Marialva Santos
Keyword(s):  
Stability Study ◽  
New Method ◽  
Coupled Analysis ◽  
Braced Excavations ◽  
Basal Heave

scholarly journals Estimating the Basal Heave Stability of Narrow Braced Excavations

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Taoli Xiao ◽  
Yanlu Yang ◽  
Hua Cai ◽  
Shaoxin Yan ◽  
Fang Cao
Keyword(s):  
Circle Method ◽  
Strength Reduction ◽  
Reduction Technique ◽  
Design Codes ◽  
Computation Model ◽  
Strength Reduction Technique ◽  
Braced Excavations ◽  
Engineering Practices ◽  
Basal Heave ◽  
Shear Strength Reduction

Engineering practices indicate that narrow braced excavation exhibits a clear size effect. However, the slip circle method in the design codes fails to consider the effect of excavation width on basal heave stability, causing waste for narrow excavation. In this paper, numerical simulation for basal heave failure of excavation with different widths was performed by FEM with SSRT (shear strength reduction technique). The results revealed that the failure mechanism of narrow excavation is different from the complete slip circle mode. In addition, the safety factor decreases increasingly slowly as the excavation widens and stabilizes when approaching the critical width. Subsequently, the corresponding computation model was presented, and an improved SCM (slip circle method) was further developed. Finally, the engineering case illustrated that it can effectively optimize the design, which exhibits clear superiority.

scholarly journals Modelling of interaction between a snow mantle and a flexible structure using a discrete element method

2002 ◽  
Vol 2 (3/4) ◽  
pp. 163-167
Author(s):  
F. Nicot ◽  
M. Gay
Keyword(s):  
Discrete Element Method ◽  
Flexible Structures ◽  
Discrete Element ◽  
New Method ◽  
Coupled Analysis ◽  
Flexible Structure ◽  
Natural Phenomena ◽  
Snow Avalanches ◽  
Element Method

Abstract. The search of improvement of protective techniques against natural phenomena such as snow avalanches continues to use classic methods for calculating flexible structures. This paper deals with a new method to design avalanche protection nets. This method is based on a coupled analysis of both net structure and snow mantle by using a Discrete Element Method. This has led to the development of computational software so that avalanche nets can be easily designed. This tool gives the evolution of the forces acting in several parts of the work as a function of the snow situation.

Basal-heave analysis of pit-in-pit braced excavations in soft clays

2017 ◽  
Vol 81 ◽  
pp. 294-306 ◽  
Author(s):  
Yuyong Sun ◽  
Shunhua Zhou ◽  
Zhe Luo
Keyword(s):  
Soft Clays ◽  
Braced Excavations ◽  
Basal Heave

Selective Sampling and Orientation of Non-Homogeneous Tissues

1968 ◽  
Vol 26 ◽  
pp. 98-99
Author(s):  
C. C. Clawson ◽  
L. W. Anderson ◽  
R. A. Good
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Light Microscopy ◽  
Random Sampling ◽  
New Method ◽  
Microscope Examination ◽  
Small Areas ◽  
Selective Sampling ◽  
Large Numbers ◽  
Specific Orientation

Investigations which require electron microscope examination of a few specific areas of non-homogeneous tissues make random sampling of small blocks an inefficient and unrewarding procedure. Therefore, several investigators have devised methods which allow obtaining sample blocks for electron microscopy from region of tissue previously identified by light microscopy of present here techniques which make possible: 1) sampling tissue for electron microscopy from selected areas previously identified by light microscopy of relatively large pieces of tissue; 2) dehydration and embedding large numbers of individually identified blocks while keeping each one separate; 3) a new method of maintaining specific orientation of blocks during embedding; 4) special light microscopic staining or fluorescent procedures and electron microscopy on immediately adjacent small areas of tissue.

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