Browsing by Subject "limit equilibrium method"

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Access status: Open Access ,
Uproszczona analiza stateczności pionowej szczeliny w gruncie
(2008) Brząkała, Włodzimierz; Gorska, Karolina
The paper presents an engineering method of the trench stability analysis basing on the three-dimensional limit equilibrium and comparing results with an elasto-plastic model. A short review of stability analyses is presented focusing on a conclusion that the third dimension (the length of the trench section) can not be neglected. The shape of the wedge for the stability calculations is composed of pyramids and prisms such that minimize the value of a factor of safety. Five cases are investigated depending on positions of the sliding zone and ground water level. The factor of safety FS for the trench of the depth H, is the ratio between sustaining hydrostatic slurry pressure Ps and effective horizontal ground pressure Ph acting with a hydrostatic water pressure Pw. Effective lateral ground pressure (Ph) is found making use of the limit force equilibrium for the sliding wedge. One example deals with a searching of the extreme value of angle 0 (versus depth H) which is the inclination of slip surface that minimizes the value of FS. Such critical values of 0 are found to be slightly greater than pi/4 + phi/2. Furthermore, the values of factors of safety FS for the simplified calculations and the ones yielding from the numerical analysis (elasto-plastic) are compared.
Access status: Open Access ,
Zastosowanie kotew gruntowych do zabezpieczenia wykopu w rejonie osuwiska
(2008) Derłacz, Marcin; Sternik, Krzysztof
The ground anchors are generally applied as an element of the stabilization structures for embankments and slopes. Following description (based on an executed project) covers the design process and carry out of anchors which have been used to protect an excavation of an existing collapse area. The analyze of the collapse reasons (supported by parallel, various calculation set) gives a proper selection of required anchors (in case of their mechanical properties, lengths etc.). The prestressing of anchors has been provided there. The scheme of anchors have been designed as typical - the separated free length section and the fixed length of grouted section - which gives (in our case) a suitable solution to keep the collapsed block against any of further removes. Efficiency of provided solutions has been confirmed by relevant surveying measures.