摘要
提出了一种黄土自重湿陷的机理———地球脉动引起饱和黄土液化，简要地介绍了地球脉动的原理，并从土动力学的角度分析了地球脉动引起饱和黄土液化的过程。通过现场浸水试验、地球脉动的定时测量及室内土工试验等，揭示了脉动的幅值、卓越周期与液化程度的关系。最后还分析了影响脉动液化的因素，结果表明，这些因素都有利于液化的产生，从而导致黄土自重湿陷。
The principle of earth microtremors is briefly introduced and the processes of saturated loess liguefaction induced by earth microtremors are analyzed from a dynamic view. A field test of loess in water immersion was done over a 420 hour period on the Gaolan Mountain in Lanzhou, China. After stopping water flooding, earth microtremors at the bottom of test impounding pits were continuously measured by seismic equipment. We conclude that there is a relationship between loess collapse values and the amplitude and predominant period of the earth microtremors. The results show that the higher the amplitude and the longer the predominant period of earth microtremors, the more intensive the liquefaction grade will be. Finally, the most probable series of affecting factors to liquefaction, such as C, φ values of loess, amplitude, frequency, duration and wave type of microtremors are all favorable to loess liquefaction.
出处
《地理科学》
CSCD
北大核心
1999年第3期271-276,共6页
Scientia Geographica Sinica
基金
国家自然科学基金
陕西省教委专项基金
关键词
黄土
自重湿陷
脉动液化机理
黄土地基
Loess self load collapse
Microtremor liquefaction
Mechanism
