饱和兰州黄土液化特性的试验研究  

Study on Liquefaction Behaviors of Saturated Original Loess in Lanzhou

作　　者：冯立[1] 葛瑞华[1] 郭康[1] 刘亚明[1] 

机构地区：[1]西北大学地质系,陕西西安710069

出　　处：《地下水》2013年第4期5-7,共3页Ground water

基　　金：高等学校博士学科点专项科研基金(20106101120008)

摘　　要：以甘肃省兰州的Q3黄土为研究对象,通过室内饱和原状黄土的液化试验,研究动荷载作用下饱和原状黄土的应力、应变的发展规律,考察了饱和原状黄土的液化特性,探讨饱和黄土在液化过程中的孔压的发展规律。研究表明:均压固结条件下,兰州饱和原状黄土,在动荷载作用下,孔压可以达到有效固结围压,产生黄土液化;同时黄土振动液化过程中应力-应变的滞回特性随着振动次数的增加发生变化以及黄土的轴向应变与孔隙水压力存在一定的关系,小轴向应变增长对应着大幅增加的孔隙水压,而在曲线发展的后期,应变大幅增加,但是孔隙水压却基本保持不变。By taking a liquefaction test on Q3 original loess in Lanzhou, this paper makes a study on changes of strains and stresses on saturated original loess under dynamic load, liquefaction characteristics of saturated original loess and changes of pore pressure in liquefaction. The result shows that under isotropic consolidation the pore pressure will reach the effective consolidation confining pressure and the saturated original loess will liquefy when effected by dynamic load. Second, variation of stress - strain hysteresis is in accordance with the increase of vibration frequency. Third, little increase in axial strain will make pore pressure increase sharply at the beginning while in the end of the curve, big increase in axial strain has no effect on pore pressure.

关 键 词：饱和黄土 振动液化 应变控制 

分 类 号：P55[天文地球—构造地质学]