Laserfiche WebLink
Rifle Gravel Pit#1 Project No.21-010R-C2 <br /> Garfield County,Colorado <br /> The LE method uses the slope profile to divide the model into vertical sections with each section <br /> contributing to the driving and resisting forces. The forces are summed, and a factor of safety is <br /> calculated as the ratio of the sum of resisting forces to the sum of driving forces. A factor of <br /> safety (FS) of 1.0 can be interpreted as the resisting forces equal the driving forces and the <br /> overall slope is at equilibrium. A less than 1.0 indicates the resisting forces are less than driving <br /> forces, or a slope below the limit of equilibrium (the slope is failing). A FS greater than 1.0, for <br /> example a FS of 1.30, indicates the total resisting forces are 30% higher than total driving <br /> forces. A FS of at least 1.50 is typically a target design value for critical structures. <br /> 3.1 STABILITY MODEL <br /> Figure 1 depicts the slope stability model for the west section (Section A). The section profile <br /> was estimated from the plans prepared by SGM. The model suggests a FS of 2.0 which is well <br /> above the minimum typical standard of 1.5 for critical structures. In addition, the theoretical <br /> failure surface is at least 85 feet from the nearest permanent facility. <br /> Ir/w w M W <br /> — U0 ,m <br /> nw.,erw us a ,m m <br /> rwr 3a ,w a ee <br /> 'Factor of&My 2.021 ....a ® os two v <br /> Figure 1 — Slope stability for west section (Section A) <br /> Figure 2 depicts the slope stability model for the east section (Section B). The model suggests <br /> a FS of 1.9 which is well above the minimum typical standard of 1.5. In addition, the theoretical <br /> failure surface is at least 77 feet from the nearest existing permanent facility. <br /> 3 �� <br />