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    Wyświetlanie 1-2 z 2
    Tytuł:
    The influence of the circular distribution of radial and tangential seismic velocity on the structural safety of residential buildings
    Autorzy:
    Chrzan, Tadeusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2172402.pdf
    Data publikacji:
    2022
    Wydawca:
    Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
    Tematy:
    ground vibrations
    seismic vibrations
    circular distribution of vibrations
    wibracje podłoża
    wibracje sejsmiczne
    rozkład drgań kołowy
    Opis:
    The article presents the results of conditions of circular distribution of seismic vibrations generated during rock blasting. The Scales of Dynamic Influences [SWD] of the harmfulness of the vibration velocity on a two-storey building [SWDI] and a five-storey building[SWDII] are given. The value of seismic velocity safe for the construction of the buildings has been determined. They are in Zone II of the Dynamic Influence Scale [SWD] SWD I and SWD II. The magnitude of the components of the vibration velocity at the same distance from the source of vibration depends on the directional angle between the line of blast holes and the line connecting the centre of the surface of the mined rock block and the place of measurement. For the circular distribution of the vibration velocity, a theoretical analysis of the change in the radial value Vx and the tangential Vy of the vibration velocity depending on the change in the directional angle was conducted. Graphs of vibration velocity for circular distribution, measured during mining of rocks and complying with theoretical predictions were presented. For residential buildings, with SWDI and SWDII, the limit value of the safe vibration velocity for the building structures is given.
    Źródło:
    Inżynieria Bezpieczeństwa Obiektów Antropogenicznych; 2022, 3; 48--54
    2450-1859
    2450-8721
    Pojawia się w:
    Inżynieria Bezpieczeństwa Obiektów Antropogenicznych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Technical safety of buildings around polish quarries against harmful seismic vibrations caused by rock blasting
    Autorzy:
    Chrzan, Tadeusz
    Sobotka, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/2201996.pdf
    Data publikacji:
    2023
    Wydawca:
    Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
    Tematy:
    seismic elliptical distribution of vibrations
    building damage
    rock blasting
    rozkład wstrząsów sejsmicznych
    uszkodzenie budynku
    wysadzanie skał
    Opis:
    This paper presents the results of measurements of the elliptical distribution of seismic vibrations generated during rock blasting. The technical safety of a building in the area of seismic vibrations is determined by the vibration velocity that does not exceed the line B included in zone II of the scale of dynamic influences [SWD]. The hypothesis proved in the paper is that for both elliptical and circular distributions of the vibration velocity in rock mining with blasting material [BM] there is a directionality of the horizontal radial component Vx and the tangential component Vy of the vibration velocity. The magnitude of the components Vx and Vy of the vibration velocity at the same distance from the vibration source depends on the directional angle "α" between the line of the blast holes and the line connecting the centre of the surface of the rock block being mined with [BM] and the place of measurement. The elliptical shapes of the graphs Vx and Vy obtained during the mining of the BM of the basalt deposit, which depend on the value of the directional angle, were compared with the shape of the circular velocity graphs Vx and Vy. New correlations are given that take into account the directional angle when calculating the maximum vibration velocity values needed to determine the damage caused to a bulding by the SWD.A dynamic impact scale [SWD] for the assessment of building damage as the vibration velocity acting on the building increases is given and discussed. Vibration velocity diagrams measured during the excavation of BM rock are presented for circular distributions in accordance with theoretical predictions. A vibration velocity diagram for an elliptical distribution, inconsistent with a circular distribution, measured during the excavation of BM rock is presented. It is shown that the directionality of the horizontal radial and tangential components of vibration velocity exists for both circular and elliptical distribution of vibration velocity in rock excavation with BM. In the conclusions, for the elliptical velocity field of the vibrations, the conditions to be observed in order to be able to direct the smallest vibrations towards the built up area are given.
    Źródło:
    Inżynieria Bezpieczeństwa Obiektów Antropogenicznych; 2023, 1; 53--60
    2450-1859
    2450-8721
    Pojawia się w:
    Inżynieria Bezpieczeństwa Obiektów Antropogenicznych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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