Calibration of the three-zone model of jet-grouting pile-soil system

• Autorzy: Bzówka J.

Warianty tytułu

PL

Kalibrowanie trójstrefowego modelu układu pal strumieniowo-iniekcyjny-grunt

• Języki publikacji: EN

Abstrakty

EN

The article deals with calibration of three-zone model, that is with evaluation of the parameters of Coulomb-Mohr model for the material of jet-grouting pile that co-operates with the soil pile, i.e. with medium sand and silty clay and contact zone. Experimental procedures as well as testing equipment and criteria of calibration were adjusted to the specificity of the materials (Bzówka [10]). Cement-soil material the pile consists of was tested at the Laboratory of Rock Mechanics in a high-pressure triaxial compression apparatus according to standard programmes of loading (at constant chamber pressure). Modulus of elasticity and Poisson's ratio were estimated on the basis of adjusting linear characteristics q- e1 and q - e3. Internal friction angle and cohesion are estimated on the basis of adjusting the Coulomb-Mohr straight lines to the results of strength tests. Soil surroundings due to their sensitiveness to loading paths were tested in two ways: either by triaxial tests or deep trial loadings. Triaxial tests on excavated soil samples were similar to those on cement-soil samples, but they were carried out after having completed the process of anisotropic consolidation of the type Ko. Deep trial loading was conducted under conditions similar to the conditions of trial loading of pile. The parameters were estimated on the basis of back analysis of the problems which simulate testing. Because of the similarity the parameters obtained by using the other way were described as representative. Estimation of parameters of the contact zone was based on the assumption that they are, in fact, reduced (by 33%) parameters for the soil mass.

PL

Opisano kalibrowanie trójstrefowego modelu, czyli oszacowano parametry modelu Coulomba-Mohra dla materiału pala strumieniowo-iniekcyjnego współdziałającego z palem gruntów (piasek średni i ił pylasty oraz warstwa kontaktowa). Procedury badawcze, aparaturę i kryteria kalibrowania dostosowano do specyfiki materiałów (BzówKA [10]). Cemento-grunty, będące tworzywem pala, były badane w Laboratorium Mechaniki Skał w wysokociśnieniowym aparacie trójosiowego ściskania według standardowych programów obciążenia (przy stałym ciśnieniu komorowym). Moduły sprężystości i współczynniki Poissona oszacowano na podstawie dopasowania liniowych charakterystyk q — e1 i q — e3, natomiast kąty tarcia wewnętrznego i spójności - na podstawie dopasowania prostych Coulomba-Mohra do rezultatów badań wytrzymałościowych. Otoczenie gruntowe, ze względu na swą wrażliwość na ścieżki obciążenia, było badane na dwa sposoby: trójosiowo oraz stosując wgłębne próbne obciążenia. Trójosiowe próbki gruntu pobrane z odkopu badano podobnie jak próbki cemento-gruntu, lecz po zakończeniu procesu konsolidacji anizotropowej typu Ko. Wgłębne próbne obciążenia prowadzono w warunkach podobnych do warunków próbnych obciążeń pala. Parametry szacowano na podstawie analizy wstecznych zagadnień symulujących badanie. Ze względu na podobieństwo jako reprezentatywne określono parametry uzyskane drugim sposobem. Estymacja parametrów warstwy kontaktowej była oparta na założeniu, że są one zredukowanymi (o 33%) parametrami masywu gruntowego.

Słowa kluczowe

EN

three-zone model; Coulomb-Mohr model; laboratory testing

PL

model trójsferowy; model Coulomba-Mohra; układ pal strumieniowo-iniekcyjny-grunt; parametry; badania laboratoryjne

• Wydawca: De Gruyter
• Czasopismo: Studia Geotechnica et Mechanica
• Rocznik: 2003
• Tom: Vol. 25, nr 3-4
• Strony: 3--51
• Opis fizyczny: Bibliogr. 54 poz., tab., wykr., rys.

Twórcy

autor

Bzówka J.

• Silesian University of Technology, Faculty of Civil Engineering, Department of Geotechnics, ul. Akademicka 5/214, 44-100 Gliwice, Poland

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