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侏罗系中等风化泥岩地基承载力试验研究

陈继彬 李雪梅

陈继彬,李雪梅. 侏罗系中等风化泥岩地基承载力试验研究[J]. 水文地质工程地质,2023,50(0): 1-9 doi:  10.16030/j.cnki.issn.1000-3665.202207002
引用本文: 陈继彬,李雪梅. 侏罗系中等风化泥岩地基承载力试验研究[J]. 水文地质工程地质,2023,50(0): 1-9 doi:  10.16030/j.cnki.issn.1000-3665.202207002
CHEN Jibin, LI Xuemei. A study of bearing capacity of the Jurassic moderately-weathered mudstone foundation[J]. Hydrogeology & Engineering Geology, 2023, 50(0): 1-9 doi:  10.16030/j.cnki.issn.1000-3665.202207002
Citation: CHEN Jibin, LI Xuemei. A study of bearing capacity of the Jurassic moderately-weathered mudstone foundation[J]. Hydrogeology & Engineering Geology, 2023, 50(0): 1-9 doi:  10.16030/j.cnki.issn.1000-3665.202207002

侏罗系中等风化泥岩地基承载力试验研究

doi: 10.16030/j.cnki.issn.1000-3665.202207002
详细信息
    作者简介:

    陈继彬(1987-),男,博士,高级工程师,主要从事岩土工程、城市特殊岩土方面的研究工作。Email:weizhishuiyu@163.com

    通讯作者:

    李雪梅(1989-),女,硕士,讲师,主要从事水利水电工程方面的研究工作。Email:766420017@qq.com

  • 中图分类号: TU44

A study of bearing capacity of the Jurassic moderately-weathered mudstone foundation

  • 摘要: 成都地区侏罗系中等风化泥岩为典型的红层软岩,工程实践表明该类岩体地基承载力的规范建议值偏低,导致该区域内高层、超高层建筑基础选型偏于保守,使得工程成本投入大、目标工期长,但是如何最大程度的发挥侏罗系中等风化泥岩地基承载能力还未有值得借鉴的方法。以成都地区某超高层建筑地基基础工程为例,针对侏罗系中等风化泥岩地基分别开展了9组深井平硐岩基载荷试验、17孔岩基旁压试验,2类试验协同分析泥岩地基承载能力及适宜的承载力特征值取值;并建立了地基承载力特征值与超声波测井试验获得的岩体特征参数的相关方程。研究结果表明:侏罗系中等风化泥岩地区,岩基平板载荷试验、旁压试验两者试验所得的地基承载力特征值(fak)相近且均较地区规范DB51/T5026-2001建议最大值大2~2.5倍,平板载荷试验的承压板直径、旁压试验的测试深度对中等风化泥岩地基承载力影响不显著;通过参数综合分析进一步得出fak与岩体波速Vp和岩体完整性指数K分别呈幂函数、指数函数递增关系。研究成果对侏罗系中等风化泥岩地基承载力的取值具有重要的参考价值。
  • 图  1  研究区中等风化泥岩岩样

    Figure  1.  Borer sample of moderately-weathered mudstone

    图  2  试验场地深井平硐、钻孔位置图

    Figure  2.  Location map of deep shaft adit and borehole at the test site

    图  3  岩基平板载荷试验

    Figure  3.  Photos of bearing plate tests

    图  4  旁压试验过程照片

    Figure  4.  Photos of pressuremeter tests

    图  5  岩基地基荷载-变形曲线

    Figure  5.  s-lgp curves

    图  6  试验岩体裂缝照片

    Figure  6.  Photo of crack deformation

    图  7  P-V曲线(TL5,测深28 m)

    Figure  7.  P-V curve (TL5, Depth 28 m)

    图  8  泥岩承载力-承压板尺寸关系图

    Figure  8.  Relationship between bearing capacity and foundation size

    图  9  旁压承载力特征值与测试深度关系图

    Figure  9.  Curve of fak vs. depth

    图  10  试验结果对比

    Figure  10.  Comparison betweeen the test results

    图  11  承载力特征值与相关参数关系曲线

    Figure  11.  Relationship between fak and VpK

    表  1  岩体物理力学参数(天然状态)

    Table  1.   Physical and mechanical properties of rock

    参数统计样本数/个最大值最小值平均值
    天然密度/(g·cm−31412.622.32.48
    单轴抗压强度/MPa519.672.716.00
    黏聚力/MPa281.20.40.8
    内摩擦角/(°)2840.133.737.9
    下载: 导出CSV

    表  2  载荷试验结果对比

    Table  2.   Comparison of load test results

    试验点号原位试验极限值/3
    对应荷载
    测点岩体
    完整性
    指数K
    竖井
    编号
    承压板
    直径/mm
    最大加载
    量/kPa
    比例界限
    对应荷载/kPa
    裂缝
    情况
    fak
    /kPa
    SJ1
    (459.06 m)
    3009 0003 0002 4000.46
    5009 6002 4002 4000.46
    8006 3002 7002 3000.43
    SJ2
    (451.15 m)
    3007 8002 4002 1000.39
    50010 8002 4002 0000.39
    80011 7002 7002 1000.39
    SJ3
    (447.54 m)
    30011 8003 6002 8000.49
    5009 6003 0003 0000.50
    80010 8003 6002 7000.43
    下载: 导出CSV

    表  3  旁压试验结果统计

    Table  3.   Results of pressuremeter tests

    钻孔编号测试深度/mPf/kPaP0/kPafak/kPa钻孔波速/(m·s−1岩体完整性指数K
    JK428.53 002.4625.22 377.22 465.00.380
    JK321.01 399.5350.01 049.51 873.00.231
    JK1020.01 294.2310.5983.72 023.00.256
    JK1213.01 495.5311.21 184.32 160.00.292
    JK1220.02 670.0698.51 971.52 204.00.304
    JK1428.03 753.0850.62 902.42 912.00.507
    TL126.53 790.2849.62 940.62 445.00.414
    TL318.54 085.11 120.32 964.82 754.00.530
    TL528.02 828.4475.62 352.82 542.00.447
    TL1120.53 715.9850.62 865.33 013.00.469
    TL1316.53 342.3942.32 400.02 555.00.452
    TL1323.02 209.1487.21 721.92 241.00.348
    TL1417.52 300.5422.11 878.42 613.00.473
    TL1614.52 489.0475.62 013.42 178.00.296
    TL1620.52 737.9475.62 262.32 824.00.498
    TL1823.02 590.6432.22 158.42 523.00.441
    TL2223.02 856.7511.22 345.52 930.00.415
    TL2524.52 707.0530.12 176.92 347.00.381
    TL2526.04 773.5681.24 092.33 094.00.663
    TL3523.03 032.5625.22 407.32 659.00.490
    TL3718.02 494.4550.01 944.42 690.00.501
    下载: 导出CSV
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