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加筋泡沫轻质土三轴剪切力学特性

许江波 王元直 骆永震 晏长根 张留俊 尹利华 杨晓华 裘友强 兰恒星

许江波, 王元直, 骆永震, 晏长根, 张留俊, 尹利华, 杨晓华, 裘友强, 兰恒星. 加筋泡沫轻质土三轴剪切力学特性[J]. 交通运输工程学报, 2020, 20(4): 120-133. doi: 10.19818/j.cnki.1671-1637.2020.04.009
引用本文: 许江波, 王元直, 骆永震, 晏长根, 张留俊, 尹利华, 杨晓华, 裘友强, 兰恒星. 加筋泡沫轻质土三轴剪切力学特性[J]. 交通运输工程学报, 2020, 20(4): 120-133. doi: 10.19818/j.cnki.1671-1637.2020.04.009
XU Jiang-bo, WANG Yuan-zhi, LUO Yong-zhen, YAN Zhang-gen, ZHANG Liu-jun, YIN Li-hua, YANG Xiao-hua, QIU You-qiang, LAN Heng-xing. Triaxial shear mechanical properties of reinforced foam lightweight soil[J]. Journal of Traffic and Transportation Engineering, 2020, 20(4): 120-133. doi: 10.19818/j.cnki.1671-1637.2020.04.009
Citation: XU Jiang-bo, WANG Yuan-zhi, LUO Yong-zhen, YAN Zhang-gen, ZHANG Liu-jun, YIN Li-hua, YANG Xiao-hua, QIU You-qiang, LAN Heng-xing. Triaxial shear mechanical properties of reinforced foam lightweight soil[J]. Journal of Traffic and Transportation Engineering, 2020, 20(4): 120-133. doi: 10.19818/j.cnki.1671-1637.2020.04.009

加筋泡沫轻质土三轴剪切力学特性

doi: 10.19818/j.cnki.1671-1637.2020.04.009
基金项目: 

国家自然科学基金项目 41790443

国家自然科学基金项目 41927806

国家重点研发计划项目 2016YFC0802203

中央高校基本科研业务费专项资金项目 300102219213

陕西省重点研发计划项目 2018ZDXM-SF-024

陕西省自然科学基金项目 2018JQ5001

陕西省自然科学基金项目 2019JQ-218

青海省科技计划项目 2019-ZJ-7050

详细信息
    作者简介:

    许江波(1985-), 男, 河南林州人, 长安大学副教授, 工学博士, 从事岩土工程研究

  • 中图分类号: U416.1

Triaxial shear mechanical properties of reinforced foam lightweight soil

Funds: 

National Natural Science Foundation of China 41790443

National Natural Science Foundation of China 41927806

National Key Research and Development Program of China 2016YFC0802203

Fundamental Research Funds for the Central Universities 300102219213

Key Research and Development Program of Shaanxi Province 2018ZDXM-SF-024

Natural Science Foundation of Shaanxi Province 2018JQ5001

Natural Science Foundation of Shaanxi Province 2019JQ-218

Science and Technology Project of Qinghai Province 2019-ZJ-7050

More Information
  • 摘要: 通过三轴剪切试验, 对比在不同加筋率和围压下, 聚丙烯纤维加筋泡沫轻质土的剪切力学特性; 研究了泡沫轻质土各强度参数与加筋率、围压之间的关系, 获取了加筋泡沫轻质土裂纹扩展规律, 建立了应力-应变全曲线方程, 提出了加筋泡沫轻质土各强度参数关于加筋率和围压的本构方程; 将不同加筋率的试验数据归一化处理后进行分析, 得到了加筋泡沫轻质土的应力-应变全曲线方程, 获取了曲线方程中各参数关于加筋率、围压2个变量之间的函数关系。分析结果表明: 加筋泡沫轻质土三轴剪切强度和黏聚力均随加筋率增加呈现先增加后减小的趋势, 在加筋率达到0.75%时达到峰值; 加筋泡沫轻质土的内摩擦角受加筋率影响较小, 说明纤维作用主要是通过改变材料黏聚力来影响加筋泡沫轻质土的强度; 而强度降低率随着加筋率增加呈现明显的下降趋势, 最大从40%左右降低至10%左右时达到稳定; 加筋率一定时, 加筋泡沫轻质土的极限强度和残余强度均随着围压的升高呈增加趋势; 经过分析体积裂纹曲线发现加筋泡沫轻质土破坏时主要经历受压、产生裂缝、纤维承受拉力限制裂缝、裂缝扩展张力过大纤维拔出4个阶段, 而加筋泡沫轻质土达到屈服阶段时往往包括裂纹的稳定扩展阶段和裂纹的不稳定扩展阶段2个裂纹发育过程, 由于缺乏筋材, 泡沫轻质土属于脆性破坏, 因此, 没有裂纹不稳定增长阶段。

     

  • 图  1  非饱和土三轴仪

    Figure  1.  Unsaturated soil triaxial apparatus

    图  2  三轴剪切试验系统

    Figure  2.  Triaxial shear test system

    图  3  试样剪切破坏形态

    Figure  3.  Shear failure forms of samples

    图  4  极限强度与残余强度变化规律

    Figure  4.  Changing laws of ultimate strength and residual strength

    图  5  不同围压下强度降低率随加筋率曲线

    Figure  5.  Curves of strength reduction rate with reinforcement ratio under different confining pressures

    图  6  抗剪强度指标随加筋率变化曲线

    Figure  6.  Changing curves of shear strength indicators with reinforcement ratio

    图  7  体积裂纹曲线

    Figure  7.  Volume crack curves

    图  8  不同围压下Y-X曲线

    Figure  8.  Y-X curves under different confining pressures

    图  9  峰前阶段Y-X曲线

    Figure  9.  Y-X curves in pre-peak stage

    图  10  峰后阶段Y-X曲线

    Figure  10.  Y-X curves after peak

    图  11  参数i关于Rfσ3二元函数

    Figure  11.  Bivariate functions of parameter i with respect to Rf and σ3

    图  12  参数k关于Rfσ3二元函数

    Figure  12.  Bivariate functions of parameter k with respect to Rf and σ3

    图  13  参数A关于Rfσ3二元函数

    Figure  13.  Bivariate functions of parameter A with respect to Rf and σ3

    图  14  参数B关于Rfσ3二元函数

    Figure  14.  Bivariate functions of parameter B with respect to Rf and σ3

    表  1  聚丙烯纤维物理参数

    Table  1.   Physical parameters of polypropylene fiber

    纤维名称 聚丙烯纤维 长度/mm 12
    抗酸碱性能 极高 分散性 极好
    燃点/℃ 580 熔点/℃ 160~180
    纤维类型 束状单丝 直径/μm 31
    断裂伸长率/% 10~28 弹性模量/MPa ≥3 850
    密度/(g·cm-3) 0.91 抗拉强度/MPa ≥500
    下载: 导出CSV

    表  2  加筋泡沫轻质土强度降低率

    Table  2.   Strength reduction rates of reinforced foam light soils

    围压/kPa 不同加筋率(%)加筋泡沫轻质土强度降低率/%
    0 0.25 0.50 0.75 1.00 1.25 1.50
    50 40.16 14.58 12.24 11.14 8.20 9.44 12.66
    70 34.65 16.78 11.91 8.35 7.35 10.03 11.40
    100 39.48 20.15 15.87 9.85 9.83 10.60 11.21
    下载: 导出CSV

    表  3  抗剪强度指标汇总

    Table  3.   Summary of shear strength indicators

    加筋率/% 0 0.25 0.50 0.75 1.00 1.25 1.50
    内摩擦角/(°) 40.757 42.765 43.127 44.308 40.786 43.573 42.315
    黏聚力/kPa 199.032 208.614 251.570 388.687 378.863 269.727 158.338
    下载: 导出CSV

    表  4  Gompertz函数拟合结果

    Table  4.   Fitting result of Gompertz function

    加筋率/% 围压/kPa k i R2
    0.00 50 3.780 0.516 0.945
    0.25 50 4.471 0.179 0.942
    0.50 50 5.271 0.343 0.957
    0.75 50 8.500 0.294 0.964
    1.00 50 11.870 0.228 0.954
    1.25 50 10.420 0.229 0.947
    1.50 50 7.138 0.205 0.947
    0.00 70 3.665 0.531 0.947
    0.25 70 4.301 0.367 0.923
    0.50 70 2.302 0.533 0.945
    0.75 70 6.114 0.248 0.968
    1.00 70 7.202 0.398 0.946
    1.25 70 5.188 0.205 0.925
    1.50 70 4.937 0.313 0.969
    0.00 100 3.288 0.523 0.941
    0.25 100 4.131 0.456 0.947
    0.50 100 3.798 0.313 0.915
    0.75 100 6.237 0.372 0.923
    1.00 100 4.838 0.365 0.938
    1.25 100 3.798 0.313 0.937
    1.50 100 5.185 0.385 0.957
    下载: 导出CSV

    表  5  Exponential函数拟合结果

    Table  5.   Fitting result of exponential function

    加筋率/% 围压/kPa A B R2
    0.00 50 4.185 -18.46 0.943 6
    0.25 50 3.650 -28.60 0.972 4
    0.50 50 4.899 -33.74 0.976 6
    0.75 50 7.858 -18.09 0.948 7
    1.00 50 14.787 -14.46 0.972 3
    1.25 50 22.212 -7.62 0.987 7
    1.50 50 2.103 -30.47 0.946 1
    0.00 70 1.959 -15.62 0.960 0
    0.25 70 9.870 -17.70 0.966 7
    0.50 70 7.864 -20.04 0.966 3
    0.75 70 1.187 -20.96 0.946 5
    1.00 70 4.513 -19.91 0.945 4
    1.25 70 4.385 -10.58 0.911 4
    1.50 70 15.180 -11.74 0.950 3
    0.00 100 1.015 -14.60 0.935 5
    0.25 100 4.185 -18.46 0.933 2
    0.50 100 6.603 -35.89 0.910 4
    0.75 100 15.130 -5.11 0.956 4
    1.00 100 2.959 -3.33 0.873 2
    1.25 100 10.850 -4.44 0.966 5
    1.50 100 44.900 -5.87 0.939 7
    下载: 导出CSV

    表  6  形状参数i统计结果

    Table  6.   Statistical result of shape parameter i

    围压/kPa 不同加筋率(%)Gompertz形状参数i
    0.00 0.25 0.50 0.75 1.00 1.25 1.50
    50 0.516 0.179 0.343 0.294 0.228 0.229 0.205
    70 0.531 0.367 0.533 0.248 0.398 0.205 0.313
    100 0.523 0.456 0.313 0.372 0.365 0.313 0.385
    下载: 导出CSV

    表  7  形状参数k统计结果

    Table  7.   Statistical result of shape parameter k

    围压/kPa 不同加筋率(%)Gompertz形状参数k
    0.00 0.25 0.50 0.75 1.00 1.25 1.50
    50 3.780 4.471 5.271 8.500 11.870 10.420 7.138
    70 3.665 4.301 2.302 6.114 7.202 5.188 4.937
    100 3.288 4.131 3.798 6.237 4.838 3.798 5.185
    下载: 导出CSV

    表  8  形状参数A统计结果

    Table  8.   Statistical result of shape parameter A

    围压/kPa 不同加筋率(%)Gompertz形状参数A
    0.00 0.25 0.50 0.75 1.00 1.25 1.50
    50 4.185 3.650 4.899 7.858 14.787 22.212 2.103
    70 1.959 9.870 7.864 1.187 4.513 4.385 15.180
    100 1.015 4.185 6.603 15.130 2.959 10.850 44.900
    下载: 导出CSV

    表  9  形状参数B统计结果

    Table  9.   Statistical result of shape parameter B

    围压/kPa 不同加筋率(%)Gompertz形状参数B
    0.00 0.25 0.50 0.75 1.00 1.25 1.50
    50 -18.46 -28.60 -33.74 -18.09 -14.46 -7.62 -30.47
    70 -15.62 -17.70 -20.04 -20.96 -19.91 -10.58 -11.74
    100 -14.60 -18.46 -35.89 -5.11 -3.33 -4.44 -5.87
    下载: 导出CSV
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  • 收稿日期:  2020-02-19
  • 刊出日期:  2020-04-25

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