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Laboratory investigation and constitutive modeling of the mechanical behavior of sand–GRP interfaces
https://orcid.org/http://orcid.org/0000-0003-0392-4703
The frictional behavior of soil–pipe interfaces plays a paramount role in the design and construction of underground pipes, particularly applying trenchless technologies and pipe-jacking method. In the recent decades, there has been a growth in the application of glass-reinforced polymer (GRP) pipes for water/sewage transmission. This experimental study incorporates direct shear testing to assess the shear strength and volume change behavior of sand–GRP interfaces, by comparing them with interfaces of the same soil in contact with rough steel and concrete. The findings confirm the notion that shear strength mobilization and dilation at the sand–GRP interface are amenable to normalized roughness of the interface and overall morphological characteristics of sand particles. Test observations indicate that increase in sand angularity, relative density and also roughness of GRP contact surface result in higher shear strength mobilization at the sand–GRP interface and more pronounced dilative behavior. Furthermore, the increase in the vertical stress leads to relatively higher peak shear strength, while leading to lower peak friction and dilation angles at sand–GRP interfaces. Test results manifest that for sand–GRP interfaces the friction angle may range from 0.65 to 0.86 of the sand’s friction angle, depending on the overall morphology of particles. It is shown that a simple critical state sand–structure interface constitutive model can capture the salient features of the mechanical behavior of different sand–GRP interfaces studied here.
Laboratory investigation and constitutive modeling of the mechanical behavior of sand–GRP interfaces
https://orcid.org/http://orcid.org/0000-0003-0392-4703
The frictional behavior of soil–pipe interfaces plays a paramount role in the design and construction of underground pipes, particularly applying trenchless technologies and pipe-jacking method. In the recent decades, there has been a growth in the application of glass-reinforced polymer (GRP) pipes for water/sewage transmission. This experimental study incorporates direct shear testing to assess the shear strength and volume change behavior of sand–GRP interfaces, by comparing them with interfaces of the same soil in contact with rough steel and concrete. The findings confirm the notion that shear strength mobilization and dilation at the sand–GRP interface are amenable to normalized roughness of the interface and overall morphological characteristics of sand particles. Test observations indicate that increase in sand angularity, relative density and also roughness of GRP contact surface result in higher shear strength mobilization at the sand–GRP interface and more pronounced dilative behavior. Furthermore, the increase in the vertical stress leads to relatively higher peak shear strength, while leading to lower peak friction and dilation angles at sand–GRP interfaces. Test results manifest that for sand–GRP interfaces the friction angle may range from 0.65 to 0.86 of the sand’s friction angle, depending on the overall morphology of particles. It is shown that a simple critical state sand–structure interface constitutive model can capture the salient features of the mechanical behavior of different sand–GRP interfaces studied here.
Laboratory investigation and constitutive modeling of the mechanical behavior of sand–GRP interfaces
https://orcid.org/http://orcid.org/0000-0003-0392-4703
The frictional behavior of soil–pipe interfaces plays a paramount role in the design and construction of underground pipes, particularly applying trenchless technologies and pipe-jacking method. In the recent decades, there has been a growth in the application of glass-reinforced polymer (GRP) pipes for water/sewage transmission. This experimental study incorporates direct shear testing to assess the shear strength and volume change behavior of sand–GRP interfaces, by comparing them with interfaces of the same soil in contact with rough steel and concrete. The findings confirm the notion that shear strength mobilization and dilation at the sand–GRP interface are amenable to normalized roughness of the interface and overall morphological characteristics of sand particles. Test observations indicate that increase in sand angularity, relative density and also roughness of GRP contact surface result in higher shear strength mobilization at the sand–GRP interface and more pronounced dilative behavior. Furthermore, the increase in the vertical stress leads to relatively higher peak shear strength, while leading to lower peak friction and dilation angles at sand–GRP interfaces. Test results manifest that for sand–GRP interfaces the friction angle may range from 0.65 to 0.86 of the sand’s friction angle, depending on the overall morphology of particles. It is shown that a simple critical state sand–structure interface constitutive model can capture the salient features of the mechanical behavior of different sand–GRP interfaces studied here.
Laboratory investigation and constitutive modeling of the mechanical behavior of sand–GRP interfaces
Acta Geotech.
Qannadizadeh, Ali (author) / Shourijeh, Piltan Tabatabaie (author) / Lashkari, Ali (author)
Acta Geotechnica ; 17 ; 4253-4275
2022-10-01
23 pages
Article (Journal)
Electronic Resource
English
Critical state friction angle , Direct shear test , Friction , Glass-reinforced polymer (GRP) , Peak friction angle , Pipe , Sand , Sand–GRP interface Engineering , Geoengineering, Foundations, Hydraulics , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics
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