地理科学

地理科学 ›› 1999, Vol. 19 ›› Issue (3): 271-276.doi: 10.13249/j.cnki.sgs.1999.03.271

• 研究报道 • 上一篇    下一篇

黄土自重湿陷变形的脉动液化机理

王家鼎1, 张倬元2, 李保雄3   

  1. 1. 西北大学城市与资源学系, 西安710069;
    2. 成都理工学院工程地质研究所, 成都610059;
    3. 甘肃省科学院地质灾害防治研究所, 兰州730000
  • 收稿日期:1998-04-09 修回日期:1998-08-15 出版日期:1999-05-20 发布日期:1999-05-20
  • 基金资助:
    国家自然科学基金;陕西省教委专项基金

A MECHANISM IN LOESS SELF LOAD COLLAPSE——The Saturated Loess Liquefaction Caused by Earth Microtremors

Wang Jiading1, Zhang Zhuoyuan2, Li Baoxiong3   

  1. 1. Department of Urban and Resources, Northwest University, Xian 710069;
    2. Institute of Engineering Geology, Chengdu College of Technology, Chengdu 610059;
    3. Geological Hazards Institute, Gansu Academy of Sciences, Lanzhou 730000
  • Received:1998-04-09 Revised:1998-08-15 Online:1999-05-20 Published:1999-05-20

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被引次数

87

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。

Abstract: 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.

中图分类号: 

  • P642.13