冲击荷载作用下饱和砂土孔压特性的简化力学模型与分析  

SIMPLIFIED MECHANICAL MODEL AND ANALYSIS ON THE CHARACTER OF SATURATED SAND UNDER IMPACT LOAD

作　　者：李世海[1] 徐以鸿[1] 张均锋[1] 孟祥跃[1] 

机构地区：[1]中国科学院力学研究所,北京100080

出　　处：《岩石力学与工程学报》2000年第3期321-325,共5页Chinese Journal of Rock Mechanics and Engineering

摘　　要：利用离散模型数值模拟了饱和砂土落地冲击实验引起砂样内动孔隙水压力的周期变化 ,指出了出现负压截断的原因 ,给出了孔隙水压力的周期与装砂结构固有频率的关系以及冲击载荷 (对应于实验中的砂土下落高度 )By distinct model, it is presented to simulate the change of dynamic pore pressure induced by the test sample of saturated sand falling down to the floor. From the investigation, the reason is explained why minus pressure is cut off. The relation between dynamic pore pressure period and the natural frequency of the experiment set for sand sample is obtained and the effect of impact load on pore pressure is given, too.

关 键 词：落地冲击 离散模型 饱和砂土 负压截断 孔压特性 

分 类 号：TU413.5[建筑科学—岩土工程] TU441[建筑科学—土工工程]