Section 261 — Reinforced Soil Slopes

Description

261.01This work consists of constructing reinforced soil slopes.

Material

261.02Conform to the following Subsections: Crushed aggregate 703.06 Reinforcement geotextile and geogrid 714.04 Soil and soil- aggregate materials 704.01 Wall facing fill 705.09 Wire facin g and backing mat 720.01(b)

Construction Requirements

261.03Submittals. At least 30 days before starting reinforced soil slope work, submit the following according to Subsection 104.06:

(a)Manufac turer’s certification. Certification and test results indicating the proposed reinforcement material and facing material meets requirements; and

(b)Facing details. Provide installation methods and connection details for facing system.

261.04General. Conform to Section 257 for Contractor -designed reinforced soil slope systems. Survey according to Section 152 and verify the limits of the reinforced soil slope installation. Excavate and pr epare foundation soils for the reinforced soil slope according to Section 204. Conserve topsoil according to Subsection 204.05. Grade the foundation soils supporting the reinforced soil slope for a width equal to the length of the lowest soil reinforcement level. Step the reinforced soil slope into existing slopes according to Subsection 204.09(d) . Construct a leveling pad from crushed aggregate or the specified material if shown in the plans. Install underdrain system according to Section 605 if shown in the plans.

261.05Soil Reinforcement and Facing. Lay each layer of soil reinforcement flat, pull tight, and hold in place wit h pins, soil piles, or other approved methods. Construct the reinforced soil slope to achieve the slopes specified and roadbed tolerances according to Subsection 204.13(c) . Grade and compact RSS backfill according to Subsections 204.09 and 204.11 before placing the next soil reinforcement layer. Maintain a minimum cover of 6 inches over the reinforcement during spreading and compacting of fill material. Avoid sudden stops, starts, and turns of the equipment. Do not use sheepsfoot rollers. Use lightweight mechanical tampers, rollers, vibratory systems, or other methods for compaction within 36 inches of the slope face. Tension the reinforcement during RSS backfill placement. Work from the slope face to the back of reinforcement. Do not leave reinforcement exposed at end of shift. At the end of each shift, shape to drain and compact the work area to a uniform cross -section. At the end of the day’ s operation, slope the last lift of backfill away from the slope face to direct surface runoff away from the slope.

261.06Acceptance. Material for reinforced soil slopes will be evaluated under Subsections 106.02, 106.03, and 106.04. Construction of reinforced soil slopes will be evaluated under Subsections 106.02 and 106.04. Excavation will b e evaluated under Section 204. Survey will be evaluated under Section 152. Underdrains will be evaluated under Section 605.

Measurement

261.07Measure the Section 261 pay items listed in the bid schedule according to Subsection 109.02 and the following as applicable: When measuring RSS backfill within the stabilized volume by the c ubic yard, measure in place.

Payment

261.08The accepted quantities will be paid at the contract price per unit of measurement for the Section 261 pay items listed in the bid schedule. Payment will be full compensation for the work prescribed in this Section. See Subsection 109.05 .