基于共振柱试验的堆积层滑坡滑带土动力特性研究  

Dynamic Characteristics of Sliding-Zone Soil of Accumulation Landslide Based on Resonant Column Test

作　　者：黄爱广 蔡晓光 黄鑫[1,3,4] 王磊 李思汉[1,3,4] 袁超 HUANG Aiguang;CAI Xiaoguang;HUANG Xin;WANG Lei;LI Sihan;YUAN Chao(Institute of Disaster Prevention,Sanhe 065201,China;China Earthquake Disaster Prevention Center,Beijing 100029,China;Langfang City Key Laboratory of Research and Application of Geosynthetic Reinforced Soil Structure,Sanhe 065201,China;Hebei Provincial Key Laboratory of Earthquake Disaster Defense and Risk Assessment,Sanhe 065201,China)

机构地区：[1]防灾科技学院,河北三河065201 [2]中国地震灾害防御中心,北京100029 [3]廊坊市加筋土结构研发与应用重点实验室,河北三河065201 [4]河北省地震灾害防御与风险评价重点实验室,河北三河065201

出　　处：《防灾科技学院学报》2024年第3期22-29,共8页Journal of Institute of Disaster Prevention

基　　金：中央高校基本科研业务费(ZY20215107);地震科技星火计划青年项目(XH23067YA)。

摘　　要：动剪切模量和阻尼比是描述土体动力特性的两个关键参数。为研究堆积层滑坡滑带土的动力特性,开展不同剪应变、含水率及围压下滑带土的共振柱试验,来研究动剪切模量与阻尼比随动剪应变的变化规律,并利用Hardin-Drnevich模型对滑带土的动力特性参数进行拟合,得到了最大动剪切模量、动剪切模量比、阻尼比试验曲线以及动力本构模型拟合参数。研究结果表明:含水率和围压是影响滑带土最大动剪切模量的两大关键因素,相同含水率条件下,最大动剪切模量随围压的增大而增大。低围压条件下,最大动剪切模量随含水率的增大而降低,且各级含水率下动剪切模量与动剪应变近似呈现线性关系,围压较高时,随着动剪应变的增加,动剪切模量的减小速度明显加快,且线性关系有所减弱。通过试验获取了不同含水率及围压条件下滑带土的动模量和阻尼比衰减曲线。基于实验数据进行回归拟合,得出了Hardin-Drnevich模型参数。为了评估滑带土的力学特性,将这些参数与袁晓铭所建议的一般黏土曲线进行了对比分析。结果显示滑带土的动剪切模量比要低于一般黏土的平均值,阻尼比大部分数据处于一般黏土的平均值。试验成果可为该类滑坡的动力稳定性分析及滑坡防治提供参考。In order to study the dynamic characteristic of sliding-zone soil of accumulation landslide,the resonant column test on sliding-zone soil with different shear strains,water contents and confining pressures was carried out to study the variation of dynamic shear modulus and damping ratio with dynamic shear strain.and then the dynamic characteristic parameters of sliding-zone soil were fit by using the Hardin-Drnevich model,and the maximum dynamic shear modulus,dynamic shear modulus ratio,damping ratio test curves and dynamic constitutive model fitting parameters were obtained.The results show that the water content and the confining pressure have a large influence on the maximum dynamic shear modulus of sliding-zone soil,and the maximum dynamic shear modulus increases with the increase of the confining pressure under the same water content condition.The maximum dynamic shear modulus decreases with the increase of water content under the condition of low confining pressure,and the relationship between dynamic shear modulus and dynamic shear strain shows approximately linear at different water content.When the confining pressure is high,the decrease rate of dynamic modulus is obviously accelerated with the increasing of the dynamic shear strain,and the linear relationship between dynamic shear modulus and dynamic shear strain is weekend.Through test,the attenuation curve between dynamic modulus and damping ratio of sliding-zone soil under the condition of different water content and confining pressure were obtained.Based on the test data,and the parameters of Hardin-Drnevich model were fitted by regression.Compared with the general clay curve suggested by Yuan Xiaoming,the results show that the dynamic shear modulus ratio of sliding-zone soil is lower than the average value of general clay soil,and most of the damping ratios are located in the average value of general clay soils.The test results can provide reference for the dynamic stability analysis and landslide control of this type of landslide.

关 键 词：堆积层滑坡滑带土 含水率 围压 动剪切模量 阻尼比 共振柱试验 

分 类 号：P642.22[天文地球—工程地质学]