土遗址土动力特性  

Dynamic Characteristics of Undisturbed and Remolded Earthen-site Soil in Hexi Area

作　　者：王平[1,2,3] 王会娟[2] 王丽丽[1,2,3] 柴少峰 WANG Ping;WANG Huijuan;WANG Lili;CHAI Shaofeng(Institute of Geotechnical Engineering, Xi’an University of Technology, Xi’an 710048, Shaanxi, China;Lanzhou Institute of Seismology, CEA, Lanzhou 730000, Gansu, China;Key Laboratory of Loess Earthquake Engineering, Gansu Province & CEA, Lanzhou 730000, Gansu, China)

机构地区：[1]西安理工大学岩土工程研究所,陕西西安710048 [2]中国地震局兰州地震研究所,甘肃兰州730000 [3]中国地震局黄土地震工程重点实验室,甘肃兰州730000

出　　处：《地震工程学报》2020年第6期1598-1603,共6页China Earthquake Engineering Journal

基　　金：甘肃省重点研发计划项目(18YF1FA101);国家自然科学基金资助项目(51678545,11572245);地震联合基金(U1939209)。

摘　　要：通过动三轴试验和数值计算,分析甘肃河西地区原状、重塑土遗址土的动模量、阻尼比、抗剪强度和土遗址在破坏地震作用下的动力响应。结果表明:弹性范围内,原状和重塑土遗址土动应力σd和动应变εd呈非线性关系且符合双曲线模型,动弹性模量E随εd的增大而减小,二者初始动弹性模量E0和剪模比G/G0差别很小,剪模比曲线基本重合;剪应变γ取值范围相同时,重塑土阻尼比λ随着γ的增大趋势高于原状土;相同实验条件下,原状土遗址土内聚力略高于重塑土。夯实加固法一定程度上恢复了土遗址强度,但当破坏地震来临时,其整体的抗震性能还有待加强.Based on dynamic triaxial tests,in this paper,we present the results of research on the dynamic modulus,damping ratio,and shear strength of undisturbed and remolded earthen-site soils in the Hexi area,Gansu Province.We then use numerical simulation to analyze the dynamic responses of earthen-site soil under the action of destructive earthquakes.The results indicate that the dynamic stress and dynamic strain of both undisturbed and remolded earthen-site soils show a nonlinear relation in the elastic range,fitting the hyperbolic model.With increases in the dynamic strain,the dynamic elastic modulus is decreased.In the same strain range,the increasing trend of the damping ratio of the remolded soil is obviously higher than that of the undisturbed soil.Under the same conditions,the cohesive force of the undisturbed soil is slightly higher than that of the remolded soil.To a certain extent,the strength of an earthen-site is restored by consolidation,but the seismic performance of the soil should be strengthened when earthquake strikes.

关 键 词：土遗址土 动力特性 动模量 阻尼比 抗剪强度 

分 类 号：TU4[建筑科学—土工工程]