Geosynthetica has some interesting photos of so called ‘whales’ in geomembranes. These giant bubbles are caused by a variety of things, but are essentially gas trapped underneath the geomembrane that can have significant buoyant force, and as the title of the post implies, even concrete ballast may not be strong enough to weight them down. [Source: geosynthetica.net. Image: FLI via geosynthetica.net]
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ASTM Updates August 2009
Another busy month for ASTM with 66 new, revised or otherwise updated standards related to geotechnical and geological engineering (although not as busy as last month). A couple that caught my eye include brand new standards for geospatial data requirements related to abandoned mines, a new standard for sampling of EPS or geofoam, updated standards for mortar and cement, flexural strength of concrete, LA Abrasion test for aggregates, acceptance testing of geosynthetic clay liners, electrical methods for leak detection of geomembranes with earth cover and classification of soils and soil-aggregate mixtures for highway construction purpose (AASHTO classification).
Those involved in the materials testing side of the business should take a close look at the full list as there are also a number of updated standards relating to various asphalt and and aggregate tests, capping of concrete cyllinders and other related testing standards.
For my practice, perhaps the most significant standard that was updated was D 2488 – Standard Practice for Description and Identification of Soils (Visual-Manual Procedure) which we rely on for our field USCS classifications. I’ll be curious to see what those changes entail. Click through for the full list.
TenCate receives patent for Geoport geotextile tube filling system
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i have seen this kind of problem in my place and i am doing my project on this. the reason was mainly due to the raising water table and lack of gas drainage . kindly suggest me some strong literatures on this .
thank you