Category:720 Mechanically Stabilized Earth Wall Systems
From Engineering Policy Guide
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720.1 Materials Guidance for Sec 720
This guidance establishes procedures for inspection and reporting of small and large block mechanically stabilized earth (MSE) wall systems. Inspection of these items covers aggregate, geotextiles, blocks, face panels, reinforcing grids, and other miscellaneous hardware necessary as show on the wall system drawings.
Sec 720 requires the contractor to deliver six copies of the MSE wall design plans. At least one of these copies should be forwarded to District Materials personnel.
The design of MSE wall systems must be approved by Bridge Division prior to construction. A listing of approved designs is maintained. If the design has not already been approved by Bridge Division, it must be submitted to Bridge and gain approval before construction can begin.
7188.8.131.52 Contract Sampling and Testing Requirements
Once District Materials has received a copy of the MSE wall plans, they should edit the Contract Sampling and Testing Requirements accordingly. Since MSE wall designs vary greatly, care should be given as to what components and quantities are required. At a minimum, there should exist a requirement for reporting the entire approved wall system. Also, since the granular backfill plays a crucial role in supporting the structure, there should be a requirement for the acceptance of this material.
Certifications should be received and checked for conformance to the various portions of Secs 720, 1052, 1011 and others necessary. The project office shall keep these certifications as part of the project files.
Due to the variance of designs, several SiteManager records may be required to correctly report acceptance of a MSE wall system and its components.
7184.108.40.206 Completed Wall System
The acceptance of constructed wall system sections built to the approved design should be reported by Construction personnel using the 0720MSEW material code.
7220.127.116.11 Granular Backfill
The certification for this material should be reviewed and a sample record made for acceptance. Any testing done to verify the certification will be reported using SiteManager.
718.104.22.168 Miscellaneous Components
Various material codes exist for reporting the components used in MSE walls. Most of these components are accepted by certification as outlined in Sec 1052. Consult the Sampling Checklist regarding reporting requirements for your specific project.