Note that the estimation of allowable bearing capacity is neither pur. This paper discusses the use of mechanically stabilized earth mse walls in ever increasing. With the aid of this text, the engineer should be able to properly select, design, specify, monitor and contract for the construction of mse walls and rss embankments. Width of excavation should allow for width of wall base. Mechanically stabilized earth wall is a generic term that describes several soil retaining systems that consist of multiple layers of inclusions that act as reinforcements in soils. Associate professor durham school of architectural engineering and construction university of nebraskalincoln a report research sponsored by nebraska department of roads nebraska transportation center june, 2009. Retaining walls such as mse walls with precast concrete panel facing that are susceptible to damage from vehicular impact shall be protected by a roadway barrier. Mechanically stabilized earth mse wall inspectors handbook. Added the rw mse dd standard as an additional required sheet. As specifications, practices, procedures, and policies change, the division of construction will issue updated construction manual sections. File b504c3, truncated base block facing mse wall for backslope or roadway with 12. B504c1, block facing mse wall with roadway rail and 1. Mseplus walls are built with only one panel type, simplifying the construction process. Mechanically stabilized earth retaining wall design data rw mse dd standard.
Other applications include bridge abutments, wing wall systems, and the creation of storage areas. Stabilized earth walls and reinforced soil slopes design and construction guidelines. Inspectors manual for mechanically stabilized earth walls. The scope of this manual includes discussions on wall components, design theories, design methodology, special design considerations, and design examples. Mse retaining walls can be employed in a variety of applications. Bridge director, indot manager, indot office of geotechnical services. Spreadsheet design of mechanically stabilized earth walls. Guidelines for the use of steel piling for bridge foundations. The mse wall design within this manual is based upon load and resistance factor design lrfd procedures. Inspectors manual for mechanically stabilized earth walls wayne jensen, ph. Chapter 5 economics and costs wisconsin department of. The rw mse dd design data is a 20 standard sheet in the proprietary retaining walls section.
Mse wall design spreadsheet in addition, the foundation should be improved by various improvement techniques such as overexcavation and replacement with compacted backfill using select material dm4 c11. Design manual, details specifications bid documents supplier design. To that end, this inspection manual has been developed in an effort to make the job of construction inspection easier. Requirements for slope stability design and analysis. In 2004, responsibility for mse wall construction was assigned to state construction geotechnical engineer. Wall type mse associated feature bridge abutment incenteroid facing directionwest wall facing type precast concrete panel panel height 5 ft. Follow wall unit and unit drainage fill installation closely with backfill.
Khan manager, office of geotechnical services, indot 101st purdue road school march 1012, 2015 march, 2015. Updated in 2020, it concisely describes the retaining wall design components and related design. Retaining wall publicaitons on the geotechnical information. Fhwa rd97142, 143, 144, and 00157 durability of geosynthetics for highway applications. Construction quality assurance for mse walls author. Bridge, culvert, and retaining wall construction manual 5 preface this manual is presented in english units of measure only. Bridge construction standards mechanically stabilized. Design methodology presented in this manual generally meets the requirements of the american. Note that the estimation of allowable bearing capacity is neither pure. For geogrid reinforced walls, continue with step 8 and step 9. Mse wall suppliers are only responsible for the internal and external stability of their walls. Wall usage by txdot august 2010 through september 2011 retaining wall by type 72% 1% 12% 3% 5% 2% 4% 1% mse conc.
Mse retaining wall design considerations by marcus galvan, p. Design manual 730 retaining walls and steep reinforced slopes. Overall, the wall development process requires an iterative collaboration between wisdot. Using one universal panel, rather than several dedicated types eliminates the logistical headaches and delays that inevitably rise from having to locate and deliver a specific panel type among hundreds while the project is on a critical path. The reinforcements are those inclusions where the soilreinforcement stress transfer occurs continuously. Some challenging sites do not allow for the installation of soil reinforcement for mse walls. Mse wall cbt contractor or consultant employees are strongly encouraged to learn the information contained in the selfstudy courses, but only fdot employees will be given the written examinations. Includes references to other publications, fhwa research and cost data. Only wall systems participating in the design consultation as described in the procedures manual shall be. The advantages of mse walls include their low cost, low design effort, speed of construction, and attractive appearance. This handbook is designed for the cei personnel and inspectors that will be involved and responsible for inspecting the construction of mechanically stabilized earth mse walls. They are also used in dam, dike and levee construction. Chapter 1 manual overview section 1 about this manual 6. A wall consisting of a volume of select backfill with tensile.
Design manual mechanically stabilized earth mse chapter. The anchored walls are typically used in the cut situation, in which the construction proceeds from the top to the base of the wall. Reinforced soil structures volume i, design and construction guidelines volume ii. This manual is intended as an aid to project engineers and inspectors in inspecting bridge, culvert, and retaining wall construction. Construction materials are the rawprocessed components incorporated into the final structure. Shored mechanically stabilized earth smse wall systems design. Modular block mechanically stabilized earth mse walls that are safe as well as costeffective. Our construction and installation manuals are available to help clients manage and prepare for construction projects.
As specifications, practices, procedures, and policies change, the division of construction will issue updated construction manual. Mse walls have been the most common retaining wall type on txdot projects for the past two decades. Be alert for new or revised specifications that may affect the current manual guidance for contract administration. They can be used as temporary structures, such as in highway projects or for containment structures. It is not intended that this manual or any provisions. Best management practices manual pc17 retaining walls 0811 chapter 5 post construction anchors. Soils which do not comply with the national guidance documents are often chosen for use in wall construction. Only wall systems participating in the design consultation as described in the procedures manual shall be included in the contract. The mse wall system must be designed to provide proper performance of adjacent roadways and structures. Once the excavation has been shored, the construction of the mse wall can be completed.
Common wall construction details keystone hardscapes. The stability of the wall system is derived from the interaction between the backfill and soil reinforcements, involving friction and tension. Since its inception in 1986, keystone has been the segmental retaining wall design leader. Payment for mse wall construction will not be made until the mse wall. All of these items have an affect on the performance of the mse wall and are taken into account in the stability analysis. Mechanically stabilized earth walls and reinforced coripa. Contains basic concepts, history and construction of soil nail walls. The following manuals apply to operations within the central. The aashto manual on subsurface investigations 1 provides further. Chapter 200geotechnical design section 200f3mechanically stabilized earth mse walls page 2 of 4 backfill materials sources.
This document outlines scdots design methodology for mechanically stabilized earth mse walls. Mse retaining wall design considerations by marcus galvan. Feedback direct any questions or comments on the content of this manual to the director of the bridge. Recommended layout of instrumentation to monitor potential. Hilfikers welded wire wall is an inextensible, allsteel mechanically stabilized earth mse retaining wall system made up of readytoinstall lshaped welded wire mesh mats placed. Maximum stacked vertical height of wall units prior to unit drainage fill and backfill placement and compaction shall not exceed 2 courses, unless special construction techniques are employed to insure complete filling of all units with unit drainage fill. Mse wall construction the wall system consists of the original ground, concrete leveling pad, wall facing panels, coping, soil reinforcement, select backfill and any loads and surcharges. Do not allow the tie strip guide or other galvanized devices to be in contact with or be. Mse walls will continue to be used in large quantities on txdot projects in the coming years. Fhwa if99026 design and construction monitoring of soil nail walls. Designers shall select wall systems to be included in this contract from the list of systems in section 432. Gec 11 design and construction of mechanically stabilized earth. Check to make sure that all required manuals and directives for the construction of the wall s have been supplied.
Filtrexx design manual, filtrexx sustainable technologies. The overall global stability of an mse wall system is the responsibility of the engineer who selects this type of wall for inclusion into the plans. The design of mse walls follows the design steps provided in chapter 18. Mse segmental wall mse wall with segmental retaining wall srw units and abutment wall mse wall with bridge foundations in any portion of the reinforced zone or an mse wall connected to an abutment wall even if bridge foundations only penetrate a small part of the reinforced zone, the entire mse wall is considered an abutment wall. The fhwashored mechanically stabilized earth smse guidelines morrison. Site examination permitting select the location and length for the retaining wall. Bridge construction standards mechanically stabilized earth. Mechanically stabilized earth mse retaining walls reco. For gravity walls continue this construction sequence to complete the wall, and proceed to step 10. For guidance, refer to structure construction s bridge construction records and procedures manual, vol.
Pc17 retaining walls idaho transportation department. Standard specification, section 554, mechanically stabilized earth system, mses construction manual, supplied by the mses designersupplier, the current nysdot geotechnical control procedure gcp issued for. Shored construction of an mse wall has been termed a shored mechanically. Through 2004 and 2005, problems with mse wall construction were investigated by oca and ose. Wisdot bridge manual chapter 5 economics and costs july 2020 51. Mechanically stabilized earth mse wall design example. Earth retaining systems include mechanically stabilized embankments, reinforced concrete crib walls, type 6 retaining walls, and alternative earth retaining systems.
Requirements for retaining wall selection, layouts, design, and excavation support. Permanent or temporary shoring is often used to stabilize the backslope in mountainous, rugged, or steep terrains. Include drainage details with a wall unless otherwise recommended to be deleted by the region materials engineer or hq geotechnical office. Bridge, culvert, and retaining wall construction manual. Mechanically stabilized earth mse a mechanically stabilized earth mse retaining wall is a composite structure consisting of alternating layers of compacted backfill and soil reinforcement elements, fixed to a wall facing. A typical drainage detail for a gravity wall in particular, an mse wall is shown in exhibit 73011. Policy documents and specifications that govern mse wall design and construction. A comprehensive field guide for reconfiguration of mse.
Key words fullheight facing, mse walls, soil reinforcement, field monitoring, instrumentation 18. Linear movements of expansion and contraction translati ons are caused by temperature changes. Reco construction manuals the reinforced earth company. Figure 2 examples of mechanically stabi lized earth walls. The construction manual contains policies and procedures related to the duties of caltrans division of construction personnel, is for information only, and is intended as a resource for personnel engaged in contract administration.
Retaining walls, fence and guardrail walls, and columns, in a convenient. Soils specified for use as infill in mse structures by current national mse wall design documents are often not available or not economically feasible for use. Project manager resources the reinforced earth company. Kansas department of transportation bridge construction manual version 808 kdot bridge section 4. The mse wall design within this manual is based upon load and. Mechanically stabilized earth mse walls in accordance with this sts and the wall manufacturers recommendations, and in conformance with the lines, grades, designs, and dimensions shown in the plans or established by the resident construction engineer rce. These guidelines outline the appropriate standard of. New fhwa mechanically stabilized earth retaining wall mse. Texas secondary evaluation and analysis for scour tseas. C geosynthetic design and construction guidelines, by r.
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