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摘要:
According to a subway station structure of three stories and three spans in soft silty clay site, a series of shaking table tests on the dynamic interaction between soil and underground structures under both near and far field ground motion are conducted. In this test, parameters such as acceleration, horizontal displacement, strain response of the station, and the pore water pressure, acceleration, seismic subsidence of soil and dynamic soil pressure on the sidewall are measured. This paper mainly analyzes the acceleration of soil under both near and far field ground motion, also studies the characteristics of the seismic subsidence. The results show that the frequency spectrum of soils present a amplification phenomenon with low frequency under near and far field motions, however, the degree of amplification effect and frequency range appear to be a great difference. Moreover, the soil softening occurs under strong earthquake and then the spectrum reflects a significant concentration effect. Besides, when it comes to the far-field motions, the values of soil's baseband are approximately equal to the basic frequency of the strong motion, so the amplification effect of the soil seems more significant. In addition, the surface subsidence becomes more serious with the increasing input peak acceleration, while the vertical relative movement between the station structure and soils seems not so obvious.
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来源 :
China Civil Engineering Journal
ISSN: 1000-131X
年份: 2010
期: SUPPL. 2
卷: 43
页码: 299-305
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