Laserfiche WebLink
III IIIIIIIIIIIII III <br />3.5.2.1 Road Profiles and Cross Sections <br />Road width varies in accordance wi[h it's purpose. Haulroads typically <br />have a minimum 60-foot width, except for a portion of the North haulroad shown <br />in profile R-R' on Exhibit 3.5-23. This section of haulroad is narrower due <br />to topographic constraints. Access roads are approximately 20 feet wide. <br />Exhibits 3.5-3 and 3.5-9 are typical cross sections of haulroad and access <br />roads, respectively. Road profiles for existing roads are shown on Exhibits <br />3.5-12 through 3.5-16, Exhibits 3.5-18 through 3.5-20, and Exhibits 3.5-23 <br />through 3.5-31. Cross sections for existing sections of roadways whose cut or <br />fill slopes exceed the maximum regulatory slope limits have also been <br />prepared. These cross sections are shown on Exhibits 3.5-32 through 3.5-36. <br />A slope stability analysis for these roads is shown in Section 3.5.2.2. For <br />proposed roadways and roadways which require improvement, cross sections have <br />been prepared to represent the construction design of these roads. Typical <br />cross sections for proposed roads axe shown on Exhibits 3.5-37 through 3.5-39. <br />Road profiles for proposed roadways are shown on Exhibits 3.5-10, 3.5-11 and <br />3.5-42. Since the upper haulroad will serve as a permanent access road upon <br />completion of mining, a profile of this road is provided on Exhibit 3.5-8 and <br />Exhibit 3.5-23. A cross section has also been prepared to depict the <br />character of the proposed road fill embankments for a segment haulroad G-G'. <br />This cross section is on 100-foot center line intervals and is shown on <br />Exhibit 3.5-43. <br />3.5.2.2 Stability Analysis of Roadway Cut and Fill Slopes <br />A common index used to compare the stability of slopes is the factor of <br />safety. The factor of safety is defined as the ratio of the total force <br />available to resist sliding to the total force tending to induce sliding. In <br />slope stability involving materials such as overburden soils and crushed rock, <br />there are no structural patterns in which a failure path can be defined. The <br />failure surface is free to find the line of least resistance through the <br />slope. In this case, the failure surface generally takes the form of a <br />circular failure. The factor of safety calculations in this slope analysis is <br />based on that theory. To calculate the factor of safety for roadway cut and <br />3.5-2 play 14,1993 <br />