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Keywords: Block Theory
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Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2238
... the excavation due to the reduction of volume and self-weight induced by the continuous cutterhead-block interaction. It is shown that this experimentally-measured stability variation of the studied block coincides with that predicted by the extended block theory. displacement boring machine rock mass...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-822
... with convex blocks, the proposed method is equivalent to the traditional block theory (TBT). For a concave block, it has at least one concave region, which can be formed by either geological joint planes or excavation surfaces, or by both of them. This method deals with the joint concave regions and the free...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0711
... ABSTRACT: The classical key block theory is mainly used for the convex blocks on the roof, floor or the walls, and is not applicable for the non-convex blocks. From the view of combinatorial theory, recent advances in block theory are discussed in this paper. Especially the intersecting ways...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0650
... ABSTRACT: Block Theory has been invented for more than 30 years, and has become a basic theory in Rock Engineering. But there is still no mature software based on Block Theory, which will greatly restrict its development and application. Considering this, the paper presents software...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0673
... ABSTRACT: Block Theory is one of the most important methods of stability analysis in computational rock mechanics. It uses whole-space stereographic projection as its principal means to reduce the dimensions of the problems from three to two, thus analyzing and solving them with graph tools...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-162
... Abstract With the application of TBM in the construction of tunnels, increasing simulations are taken on TBM tunnels. This paper first proposes the concept of utilizing Block Theory to simulate TBM tunnels in discontinuous rock masses and analyze the stability of surrounding rock blocks...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7307
... Oil & Gas stability analysis physical model Reservoir Characterization rock block Block Theory friction angle edge rotation rotational failure mode plane physical model testing rotational mode tilt table block assembly Plaster 1. INTRODUCTION A rational analysis of the stability...
Proceedings Papers

Paper presented at the 47th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2013
Paper Number: ARMA-2013-600
... for block analysis, where the 3D orientation of discontinuities within the rock mass largely influence block removability. To better represent the 3D structure of the rock mass, block theory is used to evaluate stability of removable rock blocks subject to hydraulic forces. Block theory provides a rigorous...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-337
... ABSTRACT: Block theory has been well applied to solve practical problems in rock engineering associated with the stability of discontinuous rock masses. Traditional methods of block theory are difficult to determine the actual locations of blocks, and they are always limited to the analysis...
Proceedings Papers

Paper presented at the 44th U.S. Rock Mechanics Symposium and 5th U.S.-Canada Rock Mechanics Symposium, June 27–30, 2010
Paper Number: ARMA-10-137
... ABSTRACT: The system of discontinuities that transverses a rock mass delimits rock blocks of many sizes, shapes and positions in a surficial excavation. By using the block theory, it is a possible to determine the most critical block within these isolated masses, which are denoted as key...
Proceedings Papers

Paper presented at the The 42nd U.S. Rock Mechanics Symposium (USRMS), June 29–July 2, 2008
Paper Number: ARMA-08-164
... is presented. Specifically, a continuum-discrete combined analysis combined with the key block theory formed the basis of the approach. The first step of the approach is to numerically generate various realizations of a jointed system from the local joint and bedding plane characteristics. The second step...
Proceedings Papers

Paper presented at the The 42nd U.S. Rock Mechanics Symposium (USRMS), June 29–July 2, 2008
Paper Number: ARMA-08-339
... ABSTRACT: A rock mass stability analysis method coupling block theory and three-dimensional discontinuous deformation analysis (3D DDA) has been developed. In this paper, two case histories are presented in which the coupled method developed was used to analyze the stability of underground...
Proceedings Papers

Paper presented at the The 42nd U.S. Rock Mechanics Symposium (USRMS), June 29–July 2, 2008
Paper Number: ARMA-08-042
... slopes are not in a stable condition. When the rock-mass is excavated, for example for a highway, some blocks will develop sliding according to structural planes, and then a chain reaction may occur, which may lead the collapse of whole slope. The block theory is a method to analyze rock mass stability...
Proceedings Papers

Paper presented at the The 42nd U.S. Rock Mechanics Symposium (USRMS), June 29–July 2, 2008
Paper Number: ARMA-08-050
... with regard to one of the most common failure modes, i.e. wedge failures, sixty four physical models were analyzed using BS3D and also Block Theory based on limiting equilibrium. For each of the four observed different failure modes, one case was chosen and 3D DDA analysis was conducted. The safety factors...
Proceedings Papers

Paper presented at the Golden Rocks 2006, The 41st U.S. Symposium on Rock Mechanics (USRMS), June 17–21, 2006
Paper Number: ARMA-06-1087
... ABSTRACT: A design method coupling block theory and three-dimensional discontinuous deformation analysis (3D DDA) has been developed. In this paper, two field case histories involving rock slopes are used to test the method. The stability analysis of and stabilization design for rock slopes...
Proceedings Papers

Paper presented at the Alaska Rocks 2005, The 40th U.S. Symposium on Rock Mechanics (USRMS), June 25–29, 2005
Paper Number: ARMA-05-752
... ABSTRACT: To overcome some limitations of the mode and stability analyses of Block Theory, Block Theory?s removabilityanalysis is coupled with three-dimensional Discontinuous Deformation Analysis (3D DDA) single block analysis. This results in adesign method for discontinuous rock masses...
Proceedings Papers

Paper presented at the Alaska Rocks 2005, The 40th U.S. Symposium on Rock Mechanics (USRMS), June 25–29, 2005
Paper Number: ARMA-05-739
... derived on the stability conditions of the rock slopes is rather pessimistic, that is: of the 18 road sectors, 12 are described as unstable with 5 sectors ranked as fully unstable. The block theory and toppling analyses confirm a high potential for rock slope instabilities. For the stabilization measures...
Proceedings Papers

Paper presented at the Vail Rocks 1999, The 37th U.S. Symposium on Rock Mechanics (USRMS), June 7–9, 1999
Paper Number: ARMA-99-0551
... INTRODUCTION ABSTRACT: This paper proposes a procedure, involving block theory analysis, to minimize the support necessary to stabilize removable blocks around underground excavations. The limit equilibrium procedure involves contouring excess sliding forces on a stereo net for different...
Proceedings Papers

Paper presented at the Vail Rocks 1999, The 37th U.S. Symposium on Rock Mechanics (USRMS), June 7–9, 1999
Paper Number: ARMA-99-1099
... INTRODUCTION ABSTRACT: The paper applies a new method based on block theory, stress analysis and linear programming to study the stability of a statically indeterminate 2-d block under arbitrary loads. The stability of keyblocks subjected to a range of directions of a fictitious loading...
Proceedings Papers

Paper presented at the Vail Rocks 1999, The 37th U.S. Symposium on Rock Mechanics (USRMS), June 7–9, 1999
Paper Number: ARMA-99-0037
... Subsequently, the finite element analysis was improved to handle joint elements and these were informed with opening/closing and shear non-linear constraints. Finally, we developed block theory which more naturally accommodates the three dimensional aspects of structural geological data. The original...

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