场地划分中存在的问题及建议

迟明杰 李小军 陈学良 马笙杰

迟明杰,李小军,陈学良,马笙杰. 2021. 场地划分中存在的问题及建议. 地震学报,43(0):1−17 doi: 10.11939/jass.20200152
引用本文: 迟明杰,李小军,陈学良,马笙杰. 2021. 场地划分中存在的问题及建议. 地震学报,43(0):1−17 doi: 10.11939/jass.20200152
Chi M J,Li X J,Lu X L,Ma S J. 2021. Problems and suggestions on site classification. Acta Seismologica Sinica,43(0):1−17 doi: 10.11939/jass.20200152
Citation: Chi M J,Li X J,Lu X L,Ma S J. 2021. Problems and suggestions on site classification. Acta Seismologica Sinica43(0):1−17 doi: 10.11939/jass.20200152

场地划分中存在的问题及建议

doi: 10.11939/jass.20200152
基金项目: 国家重点研发计划(2017YFC1500400)、国家自然科学基金重点项目(51639006)和国家自然科学基金(51878625)共同资助
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Problems and suggestions on site classification

  • 摘要: 针对现行建筑抗震设计规范中场地分类方法面临的场地分类物理含义不明确,各类场地的界限容易引起设计地震动参数发散等问题进行了探讨并给出解决建议。针对场地分类物理含义不明确的问题,在现行场地分类方法的基础上,根据场地覆盖层厚度和等效剪切波速,对场地进行分层次分类:第一层次与现行的分类相一致,以场地基本周期为基础,根据覆盖层厚度进行分类;第二层次在第一层次分类基础上进一步考虑场地软硬程度,根据等效剪切波速进行亚分类。根据目前对厚软场地地震灾害及地震动特性的研究,并结合大量长周期建筑结构的经济建设发展现状,对场地分类进行了扩展,由原来的四大类扩展到五大类,同时明确各分类界限,尤其是Ⅱ,Ⅲ和Ⅳ类场地的界限由原来的开放式进行有限化,有效地避免了由场地分类导致的设计地震动参数发散的问题。

     

  • 图  1  汶川地震中渭河盆地场地影响强震动加速度记录及反应谱曲线(高孟潭,2015

    Figure  1.  The site influence of Weihe basin in Wenchuan earthquake on strong vibration acceleration records and response spectrum curve (Gao,2015

    表  1  《建筑抗震设计规范》(GB50011—2010)中的场地分类方法

    Table  1.   Site classification method in Code for Seismic Design of Buildings (GB50011—2010)

    等效剪切波速vSe/(m·s−1覆盖层厚度/m
    01
    800<vS0
    500<vS≤8000
    250<vSe≤500<55≥
    150<vSe≤250<33—50>50
    vSe≤150<33—1515—80>80
      注:表中vSe表示土层计算深度内的等效剪切波速,计算深度取覆盖层厚度和20 m的较小值。
    下载: 导出CSV

    表  2  建议场地分类方法

    Table  2.   Suggested site classification method

    等效剪切波速VSE/(m·s−1覆盖层厚度/M场地类别亚类
    01IIIIIIVV
    vS>8000
    800≥vS>5000
    500≥vSe>250<55—3030—100100—280>2801
    250≥vSe>150<33—2020—9090—270>2702
    vSe≤150<33—1515—8080—260>2603
      注:表中vSe表示近地表20 m岩土介质等效剪切波速
    下载: 导出CSV

    表  3  中硬场地钻孔资料及分析结果

    Table  3.   Drilling data and analysis results of medium-hard sites

    钻孔层序厚度/m剪切波速
    /(m·s−1
    场地卓越
    周期/s
    根据钻孔资料计算的
    场地基本周期/s
    现行规范
    场地分类
    本文场地分类
    及特征描述
    CHBH101242401.42
    1.45
    2.06
    2.592
    厚中硬场地
    250340
    3176440
    4300580
    5450770
    6
    CHBH131222200.66
    0.57
    0.56
    2.222
    厚中硬场地
    278350
    3100430
    4350570
    5300680
    6
    CHBH121221901.70
    1.73
    1.97
    1.312
    厚中硬场地
    276360
    3122580
    4180680
    5450850
    6
    KNGH111222200.92
    0.94
    1.02
    1.442
    厚中硬场地
    278300
    3124580
    4126920
    51251360
    6
      注:场地的卓越周期是陈永新(2015)中根据强震记录获得的结果,下同
    下载: 导出CSV

    表  4  软弱场地钻孔资料及分析结果

    Table  4.   Drilling data and analysis results of soft sites

    钻孔层序厚度/m剪切波速
    /(m·s−1
    场地卓越
    周期/s
    根据钻孔资料计算的
    场地基本周期
    现行规范
    场地分类
    本文场地分类
    及特征描述
    IBRH07
    122901.592.623
    厚软场地
    226220
    399340
    4153500
    5350650
    6
    IBRH10
    1201100.812.523
    厚软场地
    2170380
    3220530
    4108850
    51822350
    6
    SZOH351151000.44
    0.61
    0.22
    0.923
    中厚软场地
    230380
    395690
    4
    SZOH4215500.46
    0.49
    0.783
    中厚软场地
    225260
    340630
    470690
    5
    下载: 导出CSV
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  • 收稿日期:  2020-09-10
  • 修回日期:  2020-12-03
  • 网络出版日期:  2021-11-23

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