BLOCK
Category Rock mechanics
Publisher  NISEE - University of California, Berkeley 
Platform DOS
Status Public domain
Description BASIC Programs for BLOCK Theory. A series of Block Theory programs that help to find the critical key blocks and the possibility of failure in all types of rock excavations. These were developed along with the theories outlined in the book, Block Theory and Its Application to Rock Engineering, by Richard E. Goodman and Gen-hua Shi, Prentice-Hall, 1985. The suite of Basic Programs for Block Theory include: General Key Blocks: Programs B02, B03, B10, B12, and B16 comprise General Key Blocks. B02 will compute all removable Joint Pyramids and give the corresponding modes of sliding for (a) a slope consisting of one free plane; (b) a convex slope; (c) a concave slope; and (d) all walls, edges and corners of an underground chamber. B03, based on the orientation of joints and free planes, will draw the general shapes of possibly removable blocks (potential key blocks) before excavation starts. The output block volume, the area of each face, and maximum distance are useful for computing the sliding force of key blocks, and the spacing and length of rock bolts. B10 will compute, for horizontal tunnels, inclined tunnels and vertical shafts, the angular intervals of Joint Pyramids. B10 gives the direction of the sliding force for each Joint Pyramid. The sliding force can be projected to the tunnel section plane and projected again to directions normal and tangential to the tunnel lining. Thus the sliding force can be transferred to the loading force on the tunnel lining. B12 can produce the tunnel shape for preliminary estimation of the size of key or removable blocks for the determination of tunnel support and tunnel lining requirements. The program computes the Joint Pyramids that are both removable and have a mode of sliding. Different tunnel directions can be compared using this program. When a possible block face is exposed at the excavation or natural rock surface, B16 can be used to judge if this block is finite and draw the 3D view behind the rock surface. When a possible block face is exposed at the excavation or natural rock surface, program B16 can be used to judge if this block is finite and draw the 3D view behind the rock surface. The output block volume, the area of each face, and maximum distance are useful for computing the sliding forces of key blocks, and the spacing and length of rock bolts. Stereographic Projections: The programs B05, B06, B07, B08, B13, B17, and B18 produce stereographic projection drawings to show the geometry of joints and other planes and to do the angle - related computation. Stability Analysis: Stability analysis is performed with programs B04, B09, B11, and B20. Programs for stability analysis with one, two or more joint sets. These programs display graphically all of the removable blocks of the input Joint Pyramid to reach the limit equilibrium condition, give the sliding modes for a definite resultant force. As the sliding mode changes, the sliding planes are changed. Different sliding planes have different friction angles, therefore the sliding forces have to be computed by different formulas. The positions of the resultant area relating to the friction loop will offer a global view of the stability for the changing resultants. Tunnels and Shafts: Programs B25, B29, B30, and B01 are used to produce the tunnel shape, compare different tunnel directions, estimate the size of the maximum removable blocks for the determination of tunnel support and tunnel lining requirements, to compute the maximum sliding forces of all joint pyramids for a tunnel, and to choose a safe tunnel direction in the design stage before excavation.
Cost Free on WWW
Data formats supported None stated
Supplier in United States of America  NISEE - University of California, Berkeley 

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