October 18, 2018

Best Practices for Zero Retaining Wall Failures - Variable Rock Thickness at Face


Site conditions and height can dictate the size and depth of wall rock material that should be used on your retaining wall project.  If select/structural fill is not utilized in the entire reinforced mass, then

For wall applications between up to 10 - 15 ft (3 – 4.6 m) as discussed in section 8.1, 12 in (30 cm) typical depth top to bottom.

For walls from 10 - 20 ft (3 - 6.1 m) tall, the bottom half is suggested to be increased to 24 in (60 cm) deep and the top half to be the typical depth of 12 in (30 cm) deep.

For walls over 20 ft (6.1 m) tall, the bottom half is suggested to be increased to 36 in (90 cm) deep and the top half is divided in two with a 24 in (60 cm) deep column and a 12 in (30 cm) deep column at the top.  (ref. BP, Chapter 8.2)

Allan Block is working to achieve our industry initiative of Zero Wall Failures. With our Best Practices Manual and experience in the industry we are trying to expand the knowledge base for the design of segmental retaining walls (SRW's) by communicating and educating the professionals in the industry.  To see the full Best Practices Manual, visit allanblock.com to download today and keep an eye out for more industry Best Practice recommendations here.

October 16, 2018

Best Practices for Zero Retaining Wall Failures - Tall Wall Definition


After a retaining wall reaches between 10 – 15 ft (3 – 4.6 m) it is then considered a tall wall.  The variation is based on the application and the discretion of the wall design engineer.

A 10 ft (3 m) high wall structure with a slope or structure above would be considered as a tall wall, while the same wall height constructed with a level condition above the wall without any additional surcharge may not require consideration as a tall wall.

Several factors may change a typical design when structures reach these defined higher levels such as the depth of wall rock, increased design parameters, enhanced structural fill and global stability analysis requirements.

If your wall approaches this 10 – 15 ft (3 – 4.6 m) height range, be sure to review Chapter 8 of Best Practices to learn more about these considerations.  (ref. BP, Chapter 8.1)

Allan Block is working to achieve our industry initiative of Zero Wall Failures. With our Best Practices Manual and experience in the industry we are trying to expand the knowledge base for the design of segmental retaining walls (SRW's) by communicating and educating the professionals in the industry.  To see the full Best Practices Manual, visit allanblock.com to download today and keep an eye out for more industry Best Practice recommendations here.

October 11, 2018

Best Practices for Zero Retaining Wall Failures - Wall Rock for Reinforced Corners and Curved Walls


Wall Rock placement must change when you have curves or corners in your retaining wall to aid in compaction and wall stability

For inside curved and inside cornered walls, the minimum wall rock specified should follow Best Practices Section 6.4 (paragraph a) and Section 8.2 for Tall Wall applications.

For outside curved and outside cornered walls, additional depth of wall rock should be specified to promote greater stability in these areas. Additional depth of wall rock is dependent on the total height of the wall and should be a minimum of half the wall height. (ref. BP, Chapter 7.3)

Allan Block is working to achieve our industry initiative of Zero Wall Failures. With our Best Practices Manual and experience in the industry we are trying to expand the knowledge base for the design of segmental retaining walls (SRW's) by communicating and educating the professionals in the industry.  To see the full Best Practices Manual, visit allanblock.com to download today and keep an eye out for more industry Best Practice recommendations here.