Аннотация
In Norway, the requirement for structure borne noise from tunnels
is LpAFmax = 32 dB inside dwellings. According to the Norwegian Standard
8175 it is expected that up to 20% of the exposed population are
disturbed by the noise at this level. However, the scientific basis
for this noise limit is poor. The aim of this study was to determine
the degree of annoyance and self-reported sleep disturbances as a
function of LpAFmax. In the present study, 521 dwellings exposed
to structural sound from railway rock-tunnels were identified. A
questionnaire was sent to one randomly selected person above 18 years
of age from each dwelling. The results showed that both noise induced
annoyance and reported sleep disturbances were significantly related
to LpAFmax. Other factors that increased the annoyance were high
pass-by frequency of freight trains per day, and degree of sound
insulation of the windows. At LpAFmax = 32 dB, 20% were slightly
or more than slightly annoyed, and 4% were moderately or more than
moderately annoyed. According to the pre-existing assumption that
up to 20% of the exposed population are disturbed by the noise at
this level, the present results give support to the Norwegian noise
limit LpAFmax = 32 dB inside dwellings of structure borne noise from
railway tunnels.
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