GEOE 413 Lecture Notes - Lecture 8: Shotcrete, Compressive Strength

• School: Queen's University
• Department: Geological Engineering Courses
• Course: GEOE 413
• Professor: Mark S Diederichs

Document Summary

Toppling: joint strike close to slope, joint dip steeply away from slope, pole plunge must be less than a vector of angle dip (on sterionet) black lines = joint, orange line=slope, green line=friction, blue shading=limit. Structure: 57%, gravity fall of wedge or slab. Structure and stress: 12%, includes shear slip. Discontinuity position along a scan line: follow a line and take measurements of everything along it so you don"t miss minor details. For shotcrete: linear shear capacity must be sufficient to withstand punchthrough of wedge. For arch: compressive strength and moment capacity must be enough to sustain load. For bolts: distributed capacity must be sufficient to hold weight of wedges, reinforcement must keep joints tight to use natural frictional strength of rough joints, length should penetrate through maximum realistic wedge. Structure and low stress can cause rocks to fall off. Use mesh to keep rocks from falling. Use mesh and other to keep rocks from splitting apart.