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2019-07-16_REVISION - M1988108
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2019-07-16_REVISION - M1988108
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Entry Properties
Last modified
12/27/2024 11:10:02 AM
Creation date
7/16/2019 2:01:37 PM
Metadata
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Template:
DRMS Permit Index
Permit No
M1988108
IBM Index Class Name
REVISION
Doc Date
7/16/2019
Doc Name
Incompleteness Response
From
Arcosa LWB
To
DRMS
Type & Sequence
SO3
Email Name
ECS
Media Type
D
Archive
No
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Geosyntec " <br /> consultants Page 5 of 12 <br /> Client: Arcosa LWB Project: Permit Amendment Project No.: DE0374 Task: Exhibit S—Structures Evaluation <br /> Written by: Jonathan Gillen Date: 7/8/2019 Reviewed by: Youngmin Cho Date: 7/9/2019 <br /> Approved by: Poppy Staub Date: 7/15/2019 <br /> 2. Observe the change in FS with the change in friction angle with the cohesion equal to <br /> 1,253. <br /> a. Find the friction angle corresponding to a FS of 1.5 and compare that friction angle <br /> to the friction angle selected for the static and seismic analysis. <br /> 3. Observe the change in FS with the change in cohesion for this case with the friction angle <br /> equal to 32 degrees. <br /> a. Find the cohesion value corresponding to a FS of 1.5 and compare that cohesion <br /> value to the cohesion value selected for the static and seismic analysis. <br /> RESULTS <br /> Static Stability <br /> The results of analyses for global static stability including rotational circular and non-circular <br /> failure modes are summarized in Table 3. SLIDE output is presented in Attachment B. <br /> The calculated static FS for existing conditions (i.e., during mining activities and operation) is 1.3 <br /> for the circular analysis and Bishop Simplified method. This failure surface is entirely within the <br /> alluvium layer and entirely within the Highway 93 ROW. This failure surface does not extend <br /> outside of the Highway 93 ROW. The output for the circular analysis provided in Attachment B <br /> shows the three potential failure surfaces with the lowest FS values. All fall within the Highway <br /> 93 ROW and all are entirely within the alluvium layer. The two lowest FS values are below 1.5, <br /> the third is above 1.5. <br /> The calculated FS for existing conditions is 2.9 for the non-circular analysis and Spencer method. <br /> This potential failure surface extends from Highway 93 to the existing slope of the mine. <br /> Seismic Stability <br /> The results for the seismic non-circular failure mode is also provided in Table 3. SLIDE output is <br /> presented in Attachment C. <br /> The calculated FS for existing conditions is 2.3 for the seismic non-circular analysis and Spencer <br /> method. As previously described this analysis uses a peak horizontal ground acceleration of 0.14. <br /> Statistical Anal <br /> The results for each step of the statistical analysis are provided below. SLIDE output is presented <br /> in Attachment D. <br /> 1. As stated above, the calculated FS for existing conditions is 2.9 for the static non-circular <br /> analysis and greater than 1.5 for circular analysis for critical surfaces outside of the <br /> Structures Evaluation <br /> Arcosa LWB Plan—Permit Amendment 2019-07-16 <br />
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