交通荷载作用下高温冻土动弹性模量影响因素研究  

Study on influence factors of dynamic elastic modulus of high temperature frozen soil under traffic load

作　　者：王瑛 刘俊芳[1,2,3] WANG Ying;LIU Junfang(School of Civil Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;Inner Mongolia Engineering Research Center of Geological Technology and Geotechnical Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;Key Laboratory of Geological Hazards and Geotechnical Engineering Defense in Sandy and Drought Regions at Universities of Inner Mongolia Autonomous Region,Inner Mongolia University of Technology,Hohhot 010051,China)

机构地区：[1]内蒙古工业大学土木工程学院,呼和浩特010051 [2]内蒙古工业大学地质技术与岩土工程内蒙古自治区工程研究中心,呼和浩特010051 [3]内蒙古工业大学沙旱区地质灾害与岩土工程防御自治区高等学校重点实验室,呼和浩特010051

出　　处：《内蒙古工业大学学报（自然科学版）》2023年第2期174-177,共4页Journal of Inner Mongolia University of Technology：Natural Science Edition

摘　　要：高温冻土的动弹性模量是对土层进行动力反应分析的相关参数之一,对高温冻土的动弹性模量影响因素进行研究,可以为深入研究高温多年冻土场地的动力特性提供基础的理论参考。应用室内动三轴试验,研究了频率(4、5、6 Hz)、动应力幅值(30、40、50 kPa)对高温冻结粉质黏土动弹性模量的影响规律:相同累积动应变下,频率越大,动弹性模量越大,且动弹性模量随着累积动应变的增加,逐渐增大;同一累积动应变下,幅值越低,动弹性模量越大;动应力幅值为50 kPa(-1.5℃)、频率较高时,高温冻土的动弹性模量随着累积动应变的发展先增大后减小;动应力幅值为30、40 kPa时,高温冻土的动弹性模量随着累积动应变的发展而增大。The dynamic elastic modulus of high-temperature frozen soil is one of the relevant parameters for dynamic response analysis of soil layer.The study on the influence factors of dynamic elastic modulus of high-temperature frozen soil can provide a theoretical reference for further study on the dynamic characteristics of high-temperature permafrost site.The effects of frequency(4,5,6 Hz)and amplitude of dynamtic stress(30,40,50 kPa)on the dynamic elastic modulus of high temperature frozen silty clay were studied by indoor dynamic triaxial test.Under the same cumulative dynamic strain,the greater the frequency,the greater the dynamic elastic modulus,and the dynamic elastic modulus increases with the increase of cumulative dynamic strain.Under the same cumulative dynamic strain,the lower the amplitude,the greater the dynamic elastic modulus;when the dynamic stress amplitude is 50 kPa(-1.5℃)and the frequency is high,the dynamic elastic modulus of high temperature frozen soil increases first and then decreases with the development of cumulative dynamic strain.When the dynamic stress amplitude is 30 kPa and 40 kPa,the dynamic elastic modulus of high temperature frozen soil increases with the development of accumulative dynamic strain.

关 键 词：高温冻土 动弹性模量 交通荷载 动力学特性 

分 类 号：TU43[建筑科学—岩土工程]