Influence of temperature on strut loads in braced excavations
Influence of temperature on strut loads in braced excavations
For deep excavations a significant portion of the total load on steel struts originates from temperature variations. Ignoring the temperature induced load can lead to failure of the support system as the temperature induced load has been recorded as high as 65 % of the total load. The paper presents measurements of strut temperature load variations from 4 different deep strutted excavations in central Norway. The site conditions vary between the projects, from soft, normally consolidated quick clays to stiff, overconsolidated clays, and glacial moraine deposits. A total of 29 instrumented struts have been evaluated. The measured strut load and air temperature variations are analysed and used to define the degree of end restraint for each of the instrumented struts. Measured temperature loading is compared with estimates based on empirical relations proposed in the literature and with finite element analysis. The difference in soil conditions, excavation depth and number of strut levels are further used to evaluate the differences in the measured and estimated results.
Per-Anders Mortensen; T. Sandane
18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)
D - Current and new construction methods
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