A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Response of UPVC pipes buried in sand under lateral ground movement
https://orcid.org/0000-0002-9968-9041
Highlights A novel large-scale testing chamber on laterally loaded flexible pipes is assembled. Surrounding soil changes from the general to the local shear failure mode with a higher burial depth. Soil arching effect occurs in both the active and passive loading areas. Current design cannot estimate both the ultimate soil resistance and the yield displacement adequately. Simplified method is proposed to predict the maximum strain from the pipe yield displacement.
Abstract As a key part of global lifeline infrastructure, buried pipelines play a vital role in transporting products for the daily life of human beings. However, the ultimate soil resistance and yield displacement are only derived for rigid pipes in current design guidelines, which are difficult to guide the analysis of flexible pipes. This investigation presents large-scale laboratory tests on flexible UPVC pipes subjected to lateral ground movements. The soil failure mechanism and pipe deformation were tracked. The reaction developing on UPVC pipe was measured as a function of pipe lateral displacement, embedment depth, sand bed density and pipe wall thickness. Analysis results reveal that the failure mode of soil changed from the general shear failure to the local shear failure, in which the soil arching effect occurred in both the active and passive loading areas, as the embedment ratio increased. Current design approaches could overestimate or underestimate the ultimate soil resistance of UPVC pipe heavily under various conditions, while the measured yield displacement was 2 to 3 times the prediction from the design guidelines. Finally, a simplified design method was proposed based on the pipe yield displacement for predicting the maximum longitudinal strain of UPVC pipes under lateral loading.
Response of UPVC pipes buried in sand under lateral ground movement
https://orcid.org/0000-0002-9968-9041
Highlights A novel large-scale testing chamber on laterally loaded flexible pipes is assembled. Surrounding soil changes from the general to the local shear failure mode with a higher burial depth. Soil arching effect occurs in both the active and passive loading areas. Current design cannot estimate both the ultimate soil resistance and the yield displacement adequately. Simplified method is proposed to predict the maximum strain from the pipe yield displacement.
Abstract As a key part of global lifeline infrastructure, buried pipelines play a vital role in transporting products for the daily life of human beings. However, the ultimate soil resistance and yield displacement are only derived for rigid pipes in current design guidelines, which are difficult to guide the analysis of flexible pipes. This investigation presents large-scale laboratory tests on flexible UPVC pipes subjected to lateral ground movements. The soil failure mechanism and pipe deformation were tracked. The reaction developing on UPVC pipe was measured as a function of pipe lateral displacement, embedment depth, sand bed density and pipe wall thickness. Analysis results reveal that the failure mode of soil changed from the general shear failure to the local shear failure, in which the soil arching effect occurred in both the active and passive loading areas, as the embedment ratio increased. Current design approaches could overestimate or underestimate the ultimate soil resistance of UPVC pipe heavily under various conditions, while the measured yield displacement was 2 to 3 times the prediction from the design guidelines. Finally, a simplified design method was proposed based on the pipe yield displacement for predicting the maximum longitudinal strain of UPVC pipes under lateral loading.
Response of UPVC pipes buried in sand under lateral ground movement
https://orcid.org/0000-0002-9968-9041
Highlights A novel large-scale testing chamber on laterally loaded flexible pipes is assembled. Surrounding soil changes from the general to the local shear failure mode with a higher burial depth. Soil arching effect occurs in both the active and passive loading areas. Current design cannot estimate both the ultimate soil resistance and the yield displacement adequately. Simplified method is proposed to predict the maximum strain from the pipe yield displacement.
Abstract As a key part of global lifeline infrastructure, buried pipelines play a vital role in transporting products for the daily life of human beings. However, the ultimate soil resistance and yield displacement are only derived for rigid pipes in current design guidelines, which are difficult to guide the analysis of flexible pipes. This investigation presents large-scale laboratory tests on flexible UPVC pipes subjected to lateral ground movements. The soil failure mechanism and pipe deformation were tracked. The reaction developing on UPVC pipe was measured as a function of pipe lateral displacement, embedment depth, sand bed density and pipe wall thickness. Analysis results reveal that the failure mode of soil changed from the general shear failure to the local shear failure, in which the soil arching effect occurred in both the active and passive loading areas, as the embedment ratio increased. Current design approaches could overestimate or underestimate the ultimate soil resistance of UPVC pipe heavily under various conditions, while the measured yield displacement was 2 to 3 times the prediction from the design guidelines. Finally, a simplified design method was proposed based on the pipe yield displacement for predicting the maximum longitudinal strain of UPVC pipes under lateral loading.
Response of UPVC pipes buried in sand under lateral ground movement
Liu, Jianqiang (author) / Xie, Qiwu (author) / Ye, Mingge (author) / Ni, Pengpeng (author) / Qin, Xiaogang (author)
2023-04-19
Article (Journal)
Electronic Resource
English
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