Clogging Study of Geotextile with Weathered Mudstone

by Dave Ta Teh Chang, Chung Yuan Univ, Chung Li, Taiwan,
Fu Sheng Zhuang, Chung Yuan Univ, Chung Li, Taiwan,
Chen En Chiang, Chung Yuan Univ, Chung Li, Taiwan,



Document Type: Proceeding Paper

Part of: Geosynthetics for Soil Improvement

Abstract:

This paper focuses on the combined use of fly ash and geotextiles as a solution for the typical engineering problem of weathered mudstone slopes encountered in Taiwan. In situ collapsed mudstone caused by weathering may be reused as fill materials for the geotextile-reinforced earth retaining structure for the slope problem. In this study, modified type F fly ash (lime added) was used for improving the soil particle size, and eight nonwoven specimens were used to evaluate the permeability and filtration properties with fly ash stabilized soils by the gradient ratio test. Since the modified fly ash significantly increases the particle size as known from previous studies, only 2:1 and 6:1 of fly ash to lime ratio by weight and the proper modified fly ash contents were controlled, and the mixture was cured at 38 degree C for 7 days for the gradient ratio test. The results showed that all geotextile specimens were clogged with natural soil, and the gradient ratio reached a value much greater than the maximum value of 3 suggested by the Corps of Engineers. For stabilized soil, most of them met the requirement of GR less than 3.

Subject Headings: Fly ash | Weathering | Geosynthetics | Soil stabilization | Stones | Soil properties | Recycling | Taiwan | Asia

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