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    Tytuł:
    Study on strength characteristics and permeability of chlorite schist during triaxial compression permeability
    Autorzy:
    Wang, Fuqi
    Xue, Weipei
    Qiao, Zhongdong
    Wu, Jun
    Jing, Laiwang
    Powiązania:
    https://bibliotekanauki.pl/articles/27312096.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    łupek chlorynowy
    charakterystyka wytrzymałościowa
    przepuszczalność
    kompresja trzyosiowa
    opaska kompresyjna
    chlorite schist
    strength characteristic
    permeability
    triaxial compression
    compression band
    Opis:
    In order to grasp the strength characteristics and permeability of chlorite schist, the triaxial compression permeability test of chlorite schist was carried out by using a rock triaxial servo testing machine equipped with seepage device. Based on the test results, the failure strength, initial permeability and permeability development of rock samples under different confining pressure and different pore water pressure are compared, and the failure types of rock samples under triaxial compression permeability and their influence on permeability are analyzed. The results show that the increase of confining pressure is conducive to the improvement of failure strength of chlorite schist, and the increase of pore water pressure reduces the failure strength, which is related to the inhibition of crack development in rock samples by confining pressure and the promotion of crack expansion by pore water pressure. The mechanical deformation of chlorite schist in triaxial compression permeability process has experienced initial compaction stage, linear elastic stage and crack stable propagation to failure stage. As a consequence, permeability shows three trends of decline, stable development and rise, which is closely related to the development of the internal structure of rock samples at each stage. During the failure of triaxial compression permeability, there is a local compression zone in chlorite schist, and the rising rate slows down due to the influence of the compression zone.
    Źródło:
    Archives of Civil Engineering; 2023, 69, 2; 353--365
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The ductile behavior of high performance concrete in compression
    Autorzy:
    Fantilli, A. P.
    Mihashi, H.
    Vallini, P.
    Chiaia, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/231475.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ciągliwość
    ściskanie
    beton wysokowartościowy
    beton samozagęszczalny
    beton normalnie zagęszczony
    ściskanie trójosiowe
    odporność na kruche pękanie
    ductility
    compression
    high performance concrete
    self-compacting concrete
    normal vibrated concrete
    confining pressure
    triaxial test
    fracture toughness
    Opis:
    The ductility of High Performance Concrete (HPC) can develop both in tension and compression. This aspect is evidenced in the present paper by measuring the mechanical response of normal vibrated concrete (NC), self-compacting concrete (SC) and some HPCs cylindrical specimens under uniaxial and triaxial compression. The post-peak behaviour of these specimens is defined by a non-dimensional function that relates the inelastic displacement and the relative stress during softening. As a result, in normal and self-consolidating concrete, fracture toughness in compression increases in the presence of active confinement. Moreover, HPC specimens, which can also show strain hardening in tension, provide a very ductile behaviour even in absence of confinement. In particular, during the post-peak stage, the ductility of HPC is comparable with that of NC or SC at 1 MPa of confining pressure. Moreover, the performance of fiber-reinforced composites can be quantified by the distributed confining pressure generated by the fibers. The presence of HPC in compressed columns is therefore sufficient to create a sort of active distributed confinement, and improve both the mechanical behaviour of concrete and its durability.
    Źródło:
    Archives of Civil Engineering; 2010, 56, 1; 3-18
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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