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Engineering Geology
Wedge failure on a road cut
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Engineering geology deals with the interaction of man with the earth and the effects on geologic processes that result from that interaction. ATS International provides solutions to geologic problems related to planning and implementation of engineering projects. Specifically, our firm utilizes expertise in the areas of soil and rock mechanics for slope stability problems. Slope stability is of concern in open pit mining, quarrying, highway construction, and building construction.
The stability of a rock mass depends on the orientations and characteristics of discontinuities within the rock, and usually is unrelated to the strength of the rock itself. By understanding the local geology of a slope problem, mapping the discontinuities, and performing stereonet analyses, the hazards of mass movement can be characterized and mitigated.
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MARKLAND TEST PLOT: c:\rkpk2-04\data\cbluff1.DAT
Friction Angle = 28 degrees
Slope dip direction = 75 degrees, Dip = 85 degrees
Number of Stations = 100
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By utilizing stereonet analyses, the discontinuities in a rock mass can be modeled in three dimensions and evaluated for the likelihood of course. In addition, the type of slope failure (circular, plane, wedge, or topple) can be predicted.
After characterizing the discontinuities and the potential for slope failure, steps can be taken to mitigate the hazard. Often the simplest solution is to decrease the slope angle to a safe angle determined from the analyses.
After a safe slope angle has been achieved that is unlikely to undergo catastrophic failure, the smaller scale problem of rock spalling often remains. This occurs when small rocks from the cut face fall and roll down into the area of habitation, presenting a danger to motorists or pedestrians. Sophisticated computer modeling of this phenomenon can help identify remedial steps to reduce the risk associated with rock falls.
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The model allows the user to define the mass of the rock that will fall and its origin on the slope. The model will predict how far the rock will roll and at what velocity. Simulations such as these have lead to the engineering of small troughs near the base of many road cuts that catch these rock falls or greatly reduce their energy to prevent travel into traffic areas.
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