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Rock bolt holding chain link fabric. Rock bolts work by 'knitting' the rock mass together sufficiently before it can move enough to loosen and fail by unraveling (piece by piece). As shown in the photo, rock bolts may be used to support wire mesh, but this is usually a small part of their function. Unlike common anchor bolts, rock bolts can ...
Slope stability refers to the condition of inclined soil or rock slopes to withstand or undergo movement; the opposite condition is called slope instability or slope failure. The stability condition of slopes is a subject of study and research in soil mechanics , geotechnical engineering , and engineering geology .
By many regarded as obsolete as ideas about rock and rock mass mechanical behavior have since further developed and the methodology is not suitable for modern tunneling methods using shotcrete and rock bolts. Reference: Terzaghi, K. (1946). "Rock defects and loads on tunnel supports". In Proctor, R.V.; White, T. (eds.).
Slope stability analysis is a static or dynamic, analytical or empirical method to evaluate the stability of slopes of soil- and rock-fill dams, embankments, excavated slopes, and natural slopes in soil and rock.
A rock mass with a high RMR before the adjustment factors are applied has a high reinforcement potential, and can be reinforced by, for example, rock bolts, whatever the MRMR value might be after excavation. Contrariwise, rock bolts are not a suitable reinforcement for a rock mass with a low RMR (i.e. has a low reinforcement potential).
The Q-slope method for rock slope engineering and rock mass classification is developed by Barton and Bar. [1] [2] [3] It expresses the quality of the rock mass for slope stability using the Q-slope value, from which long-term stable, reinforcement-free slope angles can be derived. The Q-slope value can be determined with:
The operation of re-profiling a slope with the aim of improving its stability, can be achieved by either: Lowering the angle of the slope, or; Positioning infill at the foot of the slope; Slope angles can be reduced by digging out the brow of the slope, usually in a step-wise fashion.
Rock Structure Rating (RSR) is a quantitative method for describing quality of a rock mass and appropriate ground support, in particular, for steel-rib support, developed by Wickham, Tiedemann and Skinner. [1] [2] [3] The RSR concept introduced a rating system for rock masses. It was the sum of weighted values in this classification system.
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