摘要
通过对重塑冻结兰州黄土的动三轴试验,较系统研究了地震荷载作用下冻土的动强度特性,并且定量研究了其在不同温度(-2℃、-5℃、-7℃)和围压(1MPa、3MPa、5MPa)条件下的变化规律.结果发现:冻结黄土的动抗剪强度随围压的增大、温度的降低、振次的减少而增大;动粘聚力Cd随振次的减小和温度的降低而增大;动内摩擦角φd随振次的增大和温度的降低而增大.
On the low-temperature triaxial test apparatus of MTS-810 at State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, systematic dynamic characteristics of frozen soil under seismic dynamic loading were studied by means of dynamic triaxial tests. Dynamic shear strength tests of frozen soil under different temperatures ( -2, -5 and -7 ℃) and different confining pressures (1, 3 and 5 MPa ) have been carried out, and the variations of parameters (dynamic cohesion (%C%-d) and dynamic friction angle (%φ%-d ) ) of these mechanical properties under different temperatures have also been studied systematically. It is found that the dynamic shear strength of frozen loess increases with increasing confining pressure, decreasing temperature and vibration number (%N%); %C%-d rises with falling %N% and temperature; %φ%-d ascends with rising %N% and descending temperature. Models for the influence of temperature and confining pressure on the dynamic strength were established.
出处
《冰川冻土》
CSCD
北大核心
2003年第6期648-652,共5页
Journal of Glaciology and Geocryology
基金
地震科学联合基金会资助课题(100134)
中国科学院知识创新工程重大项目(KZCX1 SW 04)
国家重点基础研究发展规划项目(2002CB412704)
中国地震局昆仑山口西8.1级地震科学考察项目资助
关键词
重塑冻结黄土
地震动荷载
动强度
温度
frozen soil
seismic dynamic loading
dynamic strength
temperature
