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Locating critical circular and unconstrained failure surface in slope stability analysis with tailored genetic algorithm

100%

Pasik T. , van der Meij R.

tom Vol. 39, nr 4

87--98

This article presents an efficient search method for representative circular and unconstrained slip surfaces with the use of the tailored genetic algorithm. Searches for unconstrained slip planes with rigid equilibrium methods are yet uncommon in engineering practice, and little publications regarding truly free slip planes exist. The proposed method presents an effective procedure being the result of the right combination of initial population type, selection, crossover and mutation method. The procedure needs little computational effort to find the optimum, unconstrained slip plane. The methodology described in this paper is implemented using Mathematica. The implementation, along with further explanations, is fully presented so the results can be reproduced. Sample slope stability calculations are performed for four cases, along with a detailed result interpretation. Two cases are compared with analyses described in earlier publications. The remaining two are practical cases of slope stability analyses of dikes in Netherlands. These four cases show the benefits of analyzing slope stability with a rigid equilibrium method combined with a genetic algorithm. The paper concludes by describing possibilities and limitations of using the genetic algorithm in the context of the slope stability problem.

Analiza sił wewnętrznych i przemieszczeń rozpieranej ściany szczelinowej

100%

Pasik T. , Koda E.

nr 4

W pracy przeanalizowano zabezpieczenie głębokiego wykopu w postaci rozpieranej ściany szczelinowej na przykładzie planowanej inwestycji przy ulicy Tamka w Warszawie. Przeprowadzono obliczenia sił wewnętrznych i przemieszczeń z wykorzystaniem metod Bluma i modułu reakcji podłoża. Sprawdzono możliwe do wystąpienia stany graniczne nośności i użytkowalności. Przeanalizowano także osiadanie powierzchni naziomu i jego wpływ na pobliski obiekt budowlany na podstawie wzorów empirycznych.

The paper analyses solutions of deep excavation by diaphragm wall with struts on the example of planned investment on the Tamka street in Warsaw. Conducted calculation of the internal forces and displacements using the Blum and beam on elastic foundation methods. Possible ultimate limit states were verified. Analyze of ground surface settlement and its impact on adjacent building based on empirical formulas was also done.

Analysis of embedded retaining wall using the subgrade reaction method

80%

Pasik T. , Chalecki M. , Koda E.

tom Vol. 37, nr 1

59--73

This paper analyzes the distribution of internal forces and displacements of embedded retaining wall in Quaternary deposits and Tertiary clays. Calculations have been based on the Subgrade Reaction Method (SRM) for two different types of earth pressure behind the wall (active, at-rest) in order to show the differences resulting from adopting the limit values. An algorithm for calculation of “cantilever wall” using the Mathematica program was proposed.