PSI - Issue 6

L.N. Kondratieva et al. / Procedia Structural Integrity 6 (2017) 101–108 L.N. Kondratieva, V.M. Popov,P.Ye. Medvedsky/ Structural Integrity Procedia 00 (2017) 000 – 000

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b)

Fig. 6 . Plastic points in soil body: а – without corset; b – with corset.

Analyzing the investigation results we may conclude that corset depth of 5 and 10 meters is not sufficient to localize plastic points inside the soil, however, plasticity zone is decreasing in area in relation to non-fortified soil thus causing the potential heave zone to reduce. Settlement was observed to decrease. Such occurrence may be substantiated by the fact that in soil, at critical loads, there are a lot of plastic points "gathered" by the corset around itself. In soils with small soil-to-sheet piling interaction coefficient, for each load (when p > R ) there is a critical sheet piling depth ℎ ℎ . . at which negative impact of interaction coefficient is still not exceeding the positive impact caused by plastic zone spreading widthwise. According to calculation results, foundation settlement obtained with the use of corset was found to be more than settlement obtained without thereof. Comparison of actual building settlements (in reference to deformation control benchmark) with settlements obtained using finite elements method gained satisfactory results. It is important to point out that building erected on corset-enclosed soil footing will not display differential settlement, i.e. it will be free from dangerous tilt. Gradual vertical settlement will not produce newly found unaccounted stresses in building structures. Conclusions: The newly developed methodology is suitable for engineering calculations because calculation results duly agree with (i) laboratory investigations results obtained by other researchers and (ii) results of geotechnical monitoring of construction object erected with the use of sheet pile corset. Alexeyev, S.I., Khisamov, R.R., 2014. Effect of pile sheet employment for building foundations performance enhancement. Bulletin of ST. PETERSBURG STATE TRANSPORT UNIVERSITY. 2(39), 67-73. Alexeyev, S.I., Khisamov R.R., 2013. Soil-to-vertical wall friction. Impact on footing performance inside pile sheet. Bulletin of ST. PETERSBURG STATE TRANSPORT UNIVERSITY, Saint Petersburg, 4, 79-87. Brinkgreve, R. B. J., Engin, W., Swolfs E., 2013. Plaxis 3D. Material Models Manual. Delft University of Technology & Plaxis bv, The Netherlands. Chizh I.N., 2013. Concerning effect of separating pile sheeting on stress-strain behavior of building footings in the zone of new construction. Industrial and civil construction, 25-28. References