• ISSN 1673-5722
  • CN 11-5429/P

饱和黄土场地原位试验及液化势评价

董林 严武建 夏坤 李少华 刘琨

董林, 严武建, 夏坤, 李少华, 刘琨. 饱和黄土场地原位试验及液化势评价[J]. 震灾防御技术, 2018, 13(4): 950-958. doi: 10.11899/zzfy20180422
引用本文: 董林, 严武建, 夏坤, 李少华, 刘琨. 饱和黄土场地原位试验及液化势评价[J]. 震灾防御技术, 2018, 13(4): 950-958. doi: 10.11899/zzfy20180422
Dong Lin, Yan Wujian, Xia Kun, Li Shaohua, Liu Kun. In-situ Tests and Liquefaction Potential Evaluation for Saturated Loess Sites[J]. Technology for Earthquake Disaster Prevention, 2018, 13(4): 950-958. doi: 10.11899/zzfy20180422
Citation: Dong Lin, Yan Wujian, Xia Kun, Li Shaohua, Liu Kun. In-situ Tests and Liquefaction Potential Evaluation for Saturated Loess Sites[J]. Technology for Earthquake Disaster Prevention, 2018, 13(4): 950-958. doi: 10.11899/zzfy20180422

饱和黄土场地原位试验及液化势评价

doi: 10.11899/zzfy20180422
基金项目: 

中国地震局地震预测研究所兰州科技创新基地基本科研业务费专项 2018IESLZ03

国家自然科学基金 51708525

国家自然科学基金 51608496

甘肃省青年科技基金计划 18JR3RA415

详细信息
    作者简介:

    董林, 男, 生于1985年。副研究员。主要从事岩土地震工程研究。E-mail:donglin408@163.com

In-situ Tests and Liquefaction Potential Evaluation for Saturated Loess Sites

  • 摘要: 目前,主要依靠室内动力试验对黄土液化势进行评价。由于黄土特殊的结构性,室内试验对其饱和的过程较为复杂,且与实际场地饱和黄土差异明显,导致室内黄土液化试验结果并不能代表现场饱和黄土的抗液化强度。本文选取兰州市西固区寺儿沟村某饱和黄土场地进行钻孔测试,现场实施了标准贯入试验、静力触探试验以及剪切波速测试。应用Robertson的土类指数分类图对该场地不同含水率黄土的土类进行了界定,确定了饱和黄土属于类砂土,有液化势。应用NCEER推荐方法,计算了3组原位试验数据的饱和黄土循环抗力比(CRR),通过与1976年唐山地震和1999年集集地震液化土CRR对比,得出了饱和黄土抗液化强度很低的结论。
  • 图  1  饱和黄土场地钻孔柱状图

    Figure  1.  Borehole profile of saturated loess site

    图  2  静力触探试验设备

    Figure  2.  Cone penetrometer equipment

    图  3  场地CPT测试结果

    Figure  3.  CPT test results of loess site

    图  4  场地CPT土层分层

    Figure  4.  CPT soil layer profile of loess site

    图  5  原位试验结果对比

    Figure  5.  Comparison of test results of three in-situ

    图  6  Robertson土类指数分类图

    Figure  6.  CPT-based soil behavior-type chart proposed by Robertson

    图  7  黄土土类指数分类图

    Figure  7.  CPT-based loess soil behavior-type chart

    表  1  黄土CPT土类指数

    Table  1.   loess soil behavior-type index

    深度/m qc/MPa fs/kPa Rf/% σv/kPa σv/kPa Q F/% Ic
    9.9 3.95 64.57 1.634 154.43 154.43 30.554 1.701 2.060
    12.29 3.23 49.15 1.523 193.556 193.556 21.799 1.620 2.207
    14.8 3.87 71.20 1.840 234.72 234.72 23.731 1.958 2.151
    17 5.40 71.01 1.315 272.4 272.4 31.074 1.385 2.078
    19 7.55 101.20 1.340 306.8 306.8 41.352 1.397 1.959
    20.95 6.53 98.06 1.501 340.72 340.72 33.553 1.583 2.029
    22.42 6.19 121.71 1.965 366.592 366.592 30.438 2.088 2.039
    23.97 7.63 159.47 2.091 393.872 393.872 36.437 2.205 1.958
    26 6.77 150.12 2.217 430.3 430.3 30.563 2.368 2.026
    27.65 4.66 125.78 2.701 460.95 454.45 19.687 2.997 2.197
    28.95 4.99 136.82 2.742 485.65 466.15 20.861 3.038 2.171
    下载: 导出CSV

    表  2  饱和黄土循环抗力比

    Table  2.   Cyclic resistance ratio of saturated loess

    深度/m qc/MPa fs/kPa Rf/% σv/kPa σv/kPa Ic n CQ qc1N Kc (qc1N)cs CRR
    27.65 4.66 125.78 2.701 460.95 454.45 2.197 0.7 0.469 2.197 1.659 36.250 0.080
    28.95 4.99 136.82 2.742 485.65 466.15 2.171 0.7 0.463 2.171 1.599 36.952 0.081
    下载: 导出CSV
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出版历程
  • 收稿日期:  2018-01-03
  • 刊出日期:  2018-12-01

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