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磐安结构性黄土动阻尼特征及其演化规律研究

慕焕东 孙萍 李荣建 朱思珍

慕焕东, 孙萍, 李荣建, 等, 2017. 磐安结构性黄土动阻尼特征及其演化规律研究. 地质力学学报, 23 (6): 935-942.
引用本文: 慕焕东, 孙萍, 李荣建, 等, 2017. 磐安结构性黄土动阻尼特征及其演化规律研究. 地质力学学报, 23 (6): 935-942.
MU Huandong, SUN Ping, LI Rongjian, et al., 2017. DYNAMIC DAMPING CHARACTERISTICS AND EVOLUTION LAW OF PAN'AN STRUCTURAL LOESS. Journal of Geomechanics, 23 (6): 935-942.
Citation: MU Huandong, SUN Ping, LI Rongjian, et al., 2017. DYNAMIC DAMPING CHARACTERISTICS AND EVOLUTION LAW OF PAN'AN STRUCTURAL LOESS. Journal of Geomechanics, 23 (6): 935-942.

磐安结构性黄土动阻尼特征及其演化规律研究

基金项目: 

国家自然科学基金项目 41472296

国家自然科学基金项目 11072193

陕西省黄土力学与工程重点实验室项目 14JS064

中国地质调查项目 DD20160271

详细信息
    作者简介:

    慕焕东(1989-), 男, 助理实验师, 地质工程专业, 主要从事岩土工程试验测试分析及模型试验方面的研究工作。E-mail:mhdyhx@xaut.edu.cn

    通讯作者:

    孙萍(1978-), 女, 博士, 副研, 主要从事工程地质、地质灾害方面的研究工作。E-mail:sunpingcgs@163.com

  • 中图分类号: P642

DYNAMIC DAMPING CHARACTERISTICS AND EVOLUTION LAW OF PAN'AN STRUCTURAL LOESS

  • 摘要: 地震作用往往会导致结构性黄土动强度的衰减,引发黄土滑坡、振陷等一系列地质灾害,而强度的衰减与其阻尼特性密切相关,因而结构性黄土的动态阻尼特征及其演化规律问题是岩土工程抗震的重要研究课题之一。为此,以天水磐安结构性黄土为研究对象,开展了天然、饱和条件下原状黄土和重塑黄土的动力学特性试验。在试验基础上,分析并比较了黄土的动模量、动阻尼响应特征及其演化规律。研究表明:天然、饱和条件下原状黄土和重塑黄土的动应力随动应变的增大而增大,动模量随动应变的增大而减小,动阻尼比随着动应变的增大而增大;受黄土结构性的影响,原状黄土的最大动模量比重塑黄土的稍大,原状、重塑黄土的最大动模量比饱和原状、饱合重塑黄土的稍大;黄土结构性较强时需要考虑试样固结应力对阻尼比的影响,饱和重塑黄土可以忽略试样固结应力对阻尼比的影响。

     

  • 图  1  然含水率原状黄土σd~εdEd~εd关系曲线图

    Figure  1.  σd~εdEd~εdcurves of undisturbed loess with natural moisture content

    图  2  饱和含水率原状黄土σd~εdEd~εd关系曲线图

    Figure  2.  σd~εdEd~εdcurves of undisturbed loess with saturated moisture content

    图  3  天然含水率重塑黄土σd~εdEd~εd关系曲线图

    Figure  3.  σd~εdEd~εdcurves of remodeling loess with natural moisture content

    图  4  饱和重塑黄土σd~εdEd~εd关系曲线图

    Figure  4.  σd~εdEd~εdcurves of remodeling loess with saturated moisture content

    图  5  天然含水率原状黄土1/Ed~εd关系曲线

    Figure  5.  1/Ed~εd curves of undisturbed loess with natural moisture content

    图  6  饱和含水率原状黄土1/Ed~εd关系曲线

    Figure  6.  1/Ed~εd curves of undisturbed loess with saturated moisture content

    图  7  天然含水率重塑黄土1/Ed~εd关系曲线

    Figure  7.  1/Ed~εd curves of remodeling loess with natural moisture content

    图  8  饱和含水率重塑黄土1/Ed~εd关系曲线

    Figure  8.  1/Ed~εd curves of remodeling loess with saturated moisture content

    图  9  天然含水率原状黄土的λ~γd关系曲线

    Figure  9.  λ~γd curves of undisturbed loess with natural moisture content

    图  10  饱和含水率原状黄土的λ~γd关系曲线

    Figure  10.  λ~γd curves of undisturbed loess with saturated moisture content

    图  11  天然含水率重塑黄土的λ~γd关系曲线

    Figure  11.  λ~γd curves of undisturbed loess with natural moisture content

    图  12  饱和含水率重塑黄土的λ~γd关系曲线

    Figure  12.  λ~γd curves of undisturbed loess with saturated moisture content

    表  1  试样的物理力学性质指标

    Table  1.   Physical and mechanical properties of the sample

    干密度ρd(g/cm3) 含水率w/% 比重GS 塑限wp/% 液限w1/% 孔隙比e0
    1.45 13 2.67 18.8 27.9 0.887
    下载: 导出CSV

    表  2  动模量线性回归参数

    Table  2.   Parameters of linear regression of dynamic modulus

    类型 固结围压/kPa 回归参数
    a/10-3(MPa-1) b(MPa-1) Edmax(MPa-1)
    原状黄土 100 16.50 6.11 60.6
    200 7.50 3.28 133.3
    300 6.00 2.69 166.7
    原状饱和黄土 100 9.60 16.04 104.2
    200 8.90 10.02 112.4
    300 6.90 6.65 144.9
    重塑黄土 100 27.00 7.90 37.0
    200 9.80 4.27 102.0
    300 5.13 2.47 194.9
    重塑饱和黄土 100 23.00 20.00 43.5
    200 10.00 10.37 100.0
    300 5.50 9.93 181.8
    下载: 导出CSV
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