Collapse Pressure of Thermoplastic Water Well Casings
| Autor: | Carl E. Kurt |
|---|---|
| Rok vydání: | 1979 |
| Předmět: |
chemistry.chemical_classification
Materials science Thermoplastic Thermoplastic materials Collapse (topology) Stiffness Mechanics chemistry medicine Geotechnical engineering Computers in Earth Sciences Current (fluid) medicine.symptom Galerkin method Pressure resistance Casing Water Science and Technology |
| Zdroj: | Ground Water. 17:550-555 |
| ISSN: | 1745-6584 0017-467X |
| DOI: | 10.1111/j.1745-6584.1979.tb03355.x |
| Popis: | Because of the relatively low stiffness properties of thermoplastic materials, casings made from these materials may be more susceptible to collapse. For many applications, when a surrounding material tends to support the casing, the casing resistance to collapse should be significantly increased. The Morley equations of equilibrium for two radial collapse pressure loading conditions were modified to include the support of the surrounding medium and were solved using the Galerkin method. Parametric studies were conducted for typical water well casings and restraint values. Simple collapse prediction formulas are proposed for predicting collapse for the two loading conditions considered. Collapse pressures predicted by the proposed formulas for uniform collapse pressure are approximately 25% lower than those values predicted by the current ASTM formula. Collapse pressures for linearly varying pressure were found to be 12% higher than the corresponding values for uniform pressure. When the radial stiffness of the surrounding medium is included in the analysis, the collapse pressure resistance of the casing was found to be significantly increased over the collapse resistance of an unsupported casing. |
| Databáze: | OpenAIRE |
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