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REP02129
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REP02129
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Entry Properties
Last modified
8/24/2016 11:32:59 PM
Creation date
11/26/2007 10:10:01 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
Report
Doc Date
11/1/1980
Doc Name
Landslide Study
From
Geo-Hydro Consultants
Permit Index Doc Type
STABILITY REPORT
Media Type
D
Archive
No
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1 <br />1 <br />i <br />t <br />~~ <br />II <br />I <br />I <br />~'I <br />~. <br />it <br />i <br />i <br />'~ <br />i <br />I <br />- 14 - <br />safety higher than 2.0 were obtained for a cut slope 2 (H) <br />1 (V); the cut slope has to be dewatered to the depth of <br />10 feet. The crest of__the cut should be at a safe distance Z <br />of at least 15 feet from the toe of the steep natural slope <br />above the proposed entries. The underground drainage system <br />installed to prevent the saturation of the entire cut height <br />should be capable of dewatering a layer at least 10 feet <br />thick; the cut slope should be dewatered for its entire <br />height, i. e. between the cut toe and the crest. <br />5. The same solution as recommended for entry 3 (elim- <br />inating the retaining wall and replacing it by a cut slope) <br />can be applied for entries 2 and 4; the same criteria as <br />recommended above should be applied for these gortals. <br />6. The analyses were performed and recommendations made <br />for cut configurations as indicated on Plates 2 - 6; if the <br />final design of these cuts is considerably different, the <br />recommendations should be revised. <br />The dewatering recommended in this report can be achieved <br />by various methods; two of them appear to be feasible for this <br />purpose: horizontal (or slightly inclined) drains and/or <br />vertical trenches filled with pervious material. <br />Horizontal drains comprise an effective means of dewatering. <br />They are horizontal or inclined holes drilled into the slope <br />to be dewatered; slotted PVC casing is installed in the holes. <br />A method of drain installation is shown on Plate 13; the <br />system uses a specialized drilling rig named an Aardwark. A <br />scheme of possible drain installation for the proposed mine <br />entries is shown on Plate 14. The drains are drilled in fans <br />from several locations; their length is such that they reach <br />some 120 feet behind the retaining wall. The drains should be <br />ao«.o.o cw~bww. r.c <br />
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