Browsing by Subject "evaluation of liners"

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Access status: Open Access ,
Nośność obudowy tunelu hydrotechnicznego ciągu odwadniającego C zbiornika odpadów poflotacyjnych »Żelazny Most«
(Wydawnictwa AGH, 2009) Kaczmarek, Janusz
In the paper a problem of estimation of bearing capacity of industrial hydrotechnical tunnel is discussed. The results of tunnel state exploration after twenty years of its use are published. The strength results for concrete samples taken from examination well bored in tailings dam are presented. Method of measuring of pipe wall thickness with ultrasound technique, together with basic ways of controlling the results obtained with the method, is also described. The problem of designing of massive underground structure linings for different strength criteria is discussed. Stress state solutions for elastic-perfectly plastic model with Coulomb-Mohr yield function and non-associated flow rule are considered. Problems of non-uniqueness of solution, singularities on plasticity surface and some other model contradictions are clearly pointed out. The results of numerical solutions of tunnel support bearing capacity for assumed different models of concrete behavior, i.e. elastic, elastic-perfectly plastic and elastic-brittle, are presented. The value of critical ordinate of dam's top at which the tunnel support reaches bearing capacity is estimated.