Trench effects on lateral p-y relations for pipelines embedded in stiff soils and rocks |
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| Institution: | 1. School of Civil Engineering of Chongqing University, Chongqing 400045, PR China;2. Key Laboratory of New Technology for Construction of Cities in Mountain Area(Chongqing University), Ministry of Education, Chongqing 400045, PR China;3. College of Electro-optic Engineering of Chongqing University, Chongqing 400044, PR China;4. School of Civil Engineering and Architecture, Chongqing University of Science & Technology, Chongqing 401331, China |
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| Abstract: | Existing relationships for lateral backfill pressures on pipelines assume that the trench is adequately wide to contain the failure surface. This condition is commonly violated in design and construction practice, putting at risk the pipeline safety. In this context, size and shape effects for trenches excavated in stiff soils and rocks, are numerically investigated, through experimentally-calibrated parametric analyses. It is shown that, for narrow trenches, ultimate pressures and yield displacements may increase up to an order of magnitude compared to “infinite-trench” values, while excavation of inclined walls reduces the above detrimental effects. Simplified relations are developed to aid pipeline design. |
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| Keywords: | Buried pipelines Trench Dry sand Lateral movement Numerical analyses Design |
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