... of a TBM tunnel are both illustrated in flowchart. Also, a simple example of a double shield TBM tunnel excavation is implemented based on BLKLAB and the corresponding removable blocks are analyzed. Moreover, a representative excavation step is picked out to illustrate the removable blocks around the TBM...

... methodology to identify removable blocks, determine potential failure modes, and assess block stability. An actively eroding unlined spillway at a dam site in Northern California is used to demonstrate the use of this approach for the evaluation of the scour potential at the site. stagnation pressure...

... (2003) [9]. The stereo-analytical method is a combination approach of the stereographic method and vector method. It can analyze both the convex and concave blocks, and possesses advantages of high-efficiency, algorithm simplicity and being easily programmable. removable block plane finiteness...

... Reservoir Characterization Fraser groundwater stability metals & mining ii block rock slope Block Theory removable block type II block slope angle granite discontinuity key block block theory analysis rock block ARMA 10-137 STABILITY ANALYSIS OF ROCK SLOPES USING BLOCK THEORY Haswanto...

... for the cut rock slope stability analysis. Upstream Oil & Gas stereographic projection stability analysis Rock Slope Stability analysis keyblock major discontinuity removable block rock slope discontinuity highway ssl Block Theory application highway semenyih-sg potential keyblock...

... Upstream Oil & Gas displacement removable block underground chamber dynamic ratio time step mesh dimensional DDA Computation physical data parallel tunnel rock block discontinuous deformation analysis manifold method dynamic computation DDA initial stress horizontal initial stress...

... from the coupled method and limit equilibrium analyses are again compared. block shape orientation design method coupling block theory removable jp slope surface removable block Case History discontinuity Block Theory block 3 equilibrium analysis rock mass block 2 largest...

...: Block Theory?s removability analysis is used to identify all removable block types,and the 3D DDA single block analysis is used to determine the mode and stability of each removable block type. In this paper, acomputer program that implements the coupled method is introduced. Selecting a block size...

... 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...

... siltstone/shale and sandstone, block theory was used to identify removable blocks around the tunnel opening and to analyze the stability of these blocks. The stabilization system was designed to resist movement of any key blocks. Furthermore, block theory was used to generate configurations of joint traces...

.... Therefore, a large number of curved joint traces can be computed. unrolled joint trace map maximum key block tunnel surface removable block joint trace intersection point polygon joint plane vector maximum removable area key block forward direction joint trace map removable area...

... removable blocks, are free to move into the excavation. The study of conditions necessary for the existence of removable blocks, their sliding directions, and their stability is a major topic of Block Theory (Shi and Goodman, 1981; Goodman and Shi, 1982, 1983). According to the Key-block Principle (Goodman...