Most glaciotectonically deformed deposits, including varved clays and glacial tills, are characterised by cracks and fissures. This paper presents a method for describing the yield criteria for glacitectonically deformed cohesive deposits using a model of cracked geomaterial with isotropic or anisotropic matrix. The general representation of the limit conditions for anisotropic materials in plane-strain is used to determine the yield criterion. The yield criterion represents a convex, piece-wise surface in the three-dimensional stress space revealing explicitly global, plastic properties of the materials considered. An example of using proposed yield criteria to solve a bearing capacity problem of a strip foundation constructed on a glaciotectonically cracked layer is presented. The lower and upper-bound estimates of limit loads on the strip footing are given. The limit state analysis presented in this paper can be used to solve many other geotechnical engineering problems, for example, the stability of slopes and reinforced walls or the bearing capacity of pile foundations.
The aim of this pa per is to es tab lish a cor re la tion be tween the liq uid limit value ob tained in the Casagrande ap pa ra tus (w L/cup) and in the cone pen etrom eter (w L/cone) for typ i cal gla cial sed i ments from west-cen tral Po land and com pare them with the corre la tion equa tions pub lished in the lit er a ture. The fol low ing cor re la tion was for mu lated: w L/cone = 0.91w L/cup + 1.98. The anal ysis pre sented in this pa per proves that de riv ing a gen er al ized and uni ver sal re la tion ship w L/cup /w L/cone for all co he sive soils, re gard less of their or i gin, is very chal leng ing and may not be re li able for use in the en gi neer ing prac tice. It is ver i fied that, in the range of low val ues of liq uid limit, the cone pen etrom eter gives higher val ues of w L than those ob tained from the Casagrande ap pa ra tus. How ever, for the Pol ish postglacial soils ana lysed in this pa per, the cone pen etrom eter un der es timates the re sults in re la tion to the Casagrande ap pa ra tus above w L = 22%. For the pur pose of this study, w L = 22% was defined as "the point of equiv a lent re sults" (w L/cone = w L/cup).
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