土体震陷变形试验研究

EXPERIMENTAL STUDY OF SUBSIDENCE DEFORMATION OF AEOLIAN SOIL AROUND FUXIN CITY UNDER SEISMIC LOADS

地震作用诱发的场地土震陷问题引起了人们广泛关注.以阜新地区风积土为研究对象,进行了50年超越概率2%和10%的地震载荷及等幅正弦载荷作用下风积土的震陷试验,探讨了振动次数、动应力幅值和含水量对风积土震陷系数的影响规律,建立了风积土震陷系数经验公式.依据分层总和法估算了2条地震载荷和等幅正弦载荷作用下风积土场地震陷量,并对场地风积土的震陷性进行了评价.以上研究成果将为阜新地区风积土地基的抗震防震设计提供参考依据,具有重要的工程应用价值.

Seismic settlement of ground soil due to seismic loads is an issue of geotechnology. Seismic settlement tests of Aeolian soil in west of Liaoning province were conducted under the earthquake loads exceeding that would happen with 2 and 10 percent of propability in the future 50 years and in constant amplitude loads. The effects of vibration cycles, dynamic stress amplitude and moisture contents on the seismic subsidence coefficient of Aeolian soil are evaluated. An empirical formula of Aeolian soil＇s seismic subsidence ratio is obtained. The subsidence values of Aeolian soil field under the seismic loads and constant amplitude loads are predicted according to the layerwise summation method and its seismic subsidence is assessed. The research results provide a reference for the seismic design of Aeolian soil region in west of Liaoning Province.