Modeling of delayed failure of embankments due to water infiltration

• Autorzy: Pietruszczak A. , Haghighat E.
• Języki publikacji: EN

Abstrakty

EN

The primary focus here is on modeling of fracture propagation in soils with apparent cohesion subjected to a period of intense rainfall. In this case, a micromechanically-based description represents an overwhelming task due to a very complex system of mineralogical and chemical factors. This is particularly evident at the range of irreducible saturation. Recognizing this limitation, the approach followed here is based on the framework of chemo-plasticity. The formulation incorporates an assumption that the injection of water triggers a volume change (swelling/collapse) that is coupled with a reduction in suction pressures which, in turn, results in degradation of the strength and deformation properties. The modeling of localized failure mode is based on a constitutive law formulated through volume averaging in the neighborhood of the embedded discontinuity. The latter is enhanced by employing the level set method. The governing equations are applied to examine the stability of a slope in cohesive soils, subjected to a period of intense rainfall.

PL

Artykuł skupia się na modelowaniu propagacji warstwy poślizgu w gruntach charakteryzujących się pozorną spójnością poddanych okresowym intensywnym opadom. W tym przypadku opis mikromechaniczny jest niezywkle trudnym zadaniem ze względu złożoną interakcję zbioru czynników mineralogicznych i chemicznych. Jest to szczególnie widoczne w obszarze nieredukowalnego nasycenia. Ze względu na to ograniczenie, podejście prezentowane w tym artykule bazuje na teorii chemoplastyczności. Sformułowanie wykorzystuje założenie, że infiltracja powoduje zmiany objętościowe (pęcznienie lub zapadanie się), połączone z redukcją ciśnienia ssania, które z kolei prowadzi do degradacji właściwości wytrzymałościowych i odkształcalnościowych. Modelowanie zniszczenia opiera się na związku konstytutywnym sformułowanym przez uśrednianie objętości w sąsiedztiwe nieciągłości. To ostatnie podejście jest wzbogacone poprzez zastosowanie metody poziomic (LSM). Tak sformułowane równania wykorzystuje się to badania stateczności zboczy zbudowanych z gruntów spoistych poddanych długotrwałym opadom.

Słowa kluczowe

EN

chemo-plasticity; slope stability; shear band modeling

PL

chemoplastyczność; stateczność zbocza; modelowanie pasm ścinania

• Wydawca: Silesian University of Technology
• Czasopismo: Architecture Civil Engineering Environment
• Rocznik: 2014
• Tom: Vol. 7, no. 4
• Strony: 67--75
• Opis fizyczny: Bibliogr. 24 poz.

Twórcy

autor

Pietruszczak A.

• Department of Civil Engineering, McMaster University, Hamilton, Ont. L8P3H3, Canada

autor

Haghighat E.

• Department of Civil Engineering, McMaster University, Hamilton, Ont. L8P3H3, Canada

Bibliografia

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