- Design The Filter Fabric Geosynthetic System So As To Prevent Soil From Migrating Into The System Retention Criterion 1 (39.37 KiB) Viewed 49 times
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Design the Filter Fabric (Geosynthetic system) so as to prevent soil from migrating into the system (retention criterion) as well as allowing water to pass through (permeability criterion). The geosynthetic system must survive the installation process (survivability criterion) as well as the life of the structure (clogging resistance criterion). The riprap on the slope is required to permit groundwater seepage out of the slope face, without erosion of the slope. The site is close to a recreation area with buildings. The riprap is to allow unimpeded seepage out of slope. Riprap consist of large stone (300mm to 900mm) that are placed by dropping from a backhoe. Seeps have been observed in the existing slope. The gradations of the three sand samples beneath the riprap is shown in Table 1. Native trees and shrube ECM Ruprap stones ***** Filter fabric Crushed stond Figure 1: Rip Rap System Table 1: Gradations of the Three Representative Samples Beneath the Riprap System Sieve Sixe Percent Possing, By Weight 25 13 4.76 1.68 O X4 0.42 0.15 0.074 Sample A Sample Sample C 95 98 96 93 97 95 90 95 88 92 90 77 83 So 73 72 X 35 3 20 BWSXS $8998
Table 1: Gradations of the Three Representative Samples Beneath the Riprap System Sieve Size Percent Passing, By Weight (mm) Sample A Sample B Sample C 25 13 4.76 1.68 0.84 0.42 0.15 0.074 95 93 90 88 77 50 8 3 98 97 95 92 83 73 35 20 96 95 93 90 80 72 13 2 B Following are the design parameters of the retaining wall that you are required to design Height the wall will retain = 40 ft Soil density = 120 lb/ft Bearing Capacity of Soil = 5000 lb/ft Co-efficient of friction between concrete and soil = 0.53 The angle of repose = 35 Backfill - Horizontal Use appropriate concrete and steel for your design Show your calculations and details of the reinforced concrete and the reinforcement schedule
Native trees and shrubs ECM Riprap stones Row of large anchor rocks in toe trench 1 (v) Filter fabric Crushed stone 2 (h) Source: Maine DEP Figure 1: Rip Rap System