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Bluff repair in seismically active zone
August 1st, 2021
Q: I am doing a bluff repair on the West Coast in a seismically active zone. Can you direct me to where I can get some design guidance? A: The following references are excellent in regard to your question. National Concrete Masonry Association. (2009). “Guidelines for the design and analysis of mechanically stabilized earth (MSE) […]
A geotextile filter for an edge drain
August 1st, 2021
Q: I am doing a geotextile filter design for a highway edge drain. All I have from the site is a grain size analysis of the sandy subgrade soil. Can you point me in the right direction? A: First you are going to need to calculate an estimate of hydraulic conductivity for the sandy soil […]
Design of a CCR composite liner system
August 1st, 2021
Q: We are designing a composite liner system for a coal ash landfill. From the bottom-up, the cross section is subgrade soil, geosynthetic clay liner (GCL), geomembrane, composite drainage layer with nonwoven geotextiles on both sides and then ash from coal combustion residuals (CCR). Do you have an opinion on the design, particularly on 3:1 […]
Useful service life of nonwoven geosynthetics
June 1st, 2021
Q: Where can I find literature on the useful service life of nonwoven geosynthetic fabrics installed in soils? Thank you. A: Nice to hear from you and thanks for your question in regard to the service life of nonwoven geotextiles. Below is a reference that I think is very good. In addition, I have exhumed […]
An open solicitation to join in a round-robin effort to find a substitute for Igepal CO-630
June 1st, 2021
Improved stress-cracking resistance in high-density polyethylene (HDPE) geomembranes has been a quest of our industry and a hot research topic for years. The Geosynthetic Institute (GSI) has been working in this area since the mid-1980s. The GRI GM13 standard specification for HDPE geomembranes has moved the ASTM D5397 (appendix) single point notch constant tension load […]
GCLs in cold temperatures
June 1st, 2021
Q: I am working on supporting a guide (independent) on what to consider when geosynthetic clay liners (GCLs) are installed in minus temperature regions (e.g., –4˚F [–20˚C]). There is not much published on this, especially independently. This is the only thing I found: Designation: D6102-20Standard Guide for Installation of Geosynthetic Clay Liners5.3.8 The GCL should […]
Industry standard for wall drainage systems?
June 1st, 2021
Q: I just watched your recorded video of mechanically stabilized earth (MSE) wall inspection. Thank you for the presentation; it was very informative. I do have a follow-up question for you. I was recently the site engineer for a precast panel MSE wall and now have the opportunity to inspect construction of the wall that […]
Geotextile under articulated systems in slope armoring
June 1st, 2021
Q: I have a question about the geotextile placed under articulated systems in slope armoring. Based on my understanding, a drainage layer is recommended between the geotextile and the armoring structure, but, since the armoring structure has some spaces in between the armoring blocks, won’t the particles of the drainage layer be washed out through […]
OIT for UV and oven aging
June 1st, 2021
Q: I am contacting you in regard to the requirements for oxidative induction time (OIT) (standard [STD] and high pressure [HP]) in the GRI-GM13 specification for both ultraviolet light and oven aging. Do you need to conduct both OIT tests or just one or the other? A: I would strongly recommend reading the EuroGeo 4 […]
Geomembranes for reinforcement?
April 1st, 2021
Q: We are using Robert Koerner’s Designing with Geosynthetics to calculate the required thickness of a geomembrane. See Figure 1 and Equation 1 from the book for details. Figure 1 Equation 1 Can you point us in the right direction with the mobilization distance, x? A: Yes, please see Figure 2 for high-density polyethylene (HDPE). […]