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PERMFILE121779
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Last modified
8/24/2016 10:20:02 PM
Creation date
11/25/2007 9:42:44 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1996084
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Section_Exhibit Name
EXHIBIT 13A SLOPE STABILITY ISSUES FOR LORENCITO COAL UNDERGROUND DEVELOPMENT WASTE PILE
Media Type
D
Archive
No
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<br /> <br />Slope Stability Issues for Lorencito Coal Undereround Development VI'aste Pile <br />Plane and cylindrical failure aze the two most common forms of slope failure. <br />A plane failure nonually occurs as shown below when a slope consists of layers which may form <br />weak planes parallel to the slope. This type of failure is not applicable to a rock pile built in <br />small lifts and compacted at an angle to the slope. <br />,~ <br />•~ <br />•~ <br />•~ <br />~~ Weak Plane <br />i~ <br />i~ <br />i~ <br />i~ <br />i <br />.r <br />Example of Plane Failure <br />Cylindrical failure occurs when the cohesive and angular frictional forces of the material are not <br />strong enough to withstand the gravity component. The most common failure of this type is <br />circular or cylindrical in nature as shown on the following sketch. This type of failure is possible <br />in many types of materials, especially those that have steep slopes and poor strength <br />chazacteristics, which are compounded by wet conditions. <br />• <br />
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