2002 W Alton Ave - Soils Report - Laserfiche WebLink

Home Browse Search

Project No. D-3885-06 Christ Our Savior Catholic Parish CPT-5 0.289 0.01I 0.300 0.33 0.02 0.3 5 B-1 2.406 0.006 2.4t 3.t36 0.006 3. 140 B-5 2.054 0.013 2.074 0.064 According to the analyses, earthquake-induced total seismic settlement for five CPT's varied from 0.3 inch to 1.212 inches when considering historical high groundwater depth of 5 feet and varied from 0.35 inch to l.4l inch for the existing groundwater level of 14 feet. Similarly, Seismic-induced settlement varied from 2.41 inches to 2.07 inches on borings B-l and B-5 for groundwater depths considered at 5 feet and 3.14 inches to 2.14 inches considering the existing ground water depth at l4 feet. Differential settlement is less than % " within the span of 30 feet. These possible seismic settlements besides static settlements should be considered while designing loundations for New Sanctuary, Parish Center, and New Meeting Rooms Building structures. Lateral Spreading Lateral spreading of the ground surface during an earthquake usually takes place along weak shear zones that have formed within a liquefiable soil layer. Lateral spread has generally been observed to take place in the direction of a free-face (i.e., retaining wall, slope, channel) but has also been observed to a lesser extent on sites with very gentle slopes. Other factors such as earthquake magnitude, distance from the eadhquake epicenter, thickness of the liquefiable layers, and the fines content and particle sizes of the liquefrable layers also affect the amount of lateral ground displacement. Based on the results ofour field observation and testing, laboratory evaluation of samples retrieved from the exploratory borings, and our liquefaction analyses, we are of the opinion that the subject site cannot be characterized as having a laterally continuous, weak layer at any specific depth along which lateral spreading may occur. Moreover, n I I I I I I I I T I I I I I I I 2.138 n E I 2.067 I t9