| 斜坡地基静力触探试验离散元分析 |
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| 引用本文： | 彭镝,蒋明镜.斜坡地基静力触探试验离散元分析[J].西北地震学报,2015,37(S1):57-62. |
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| 作者姓名： | 彭镝 蒋明镜 |
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| 作者单位： | 同济大学地下建筑与工程系, 上海 200092;同济大学岩土及地下工程教育部重点实验室, 上海 200092;同济大学土木工程防灾国家重点实验室, 上海 200092,同济大学地下建筑与工程系, 上海 200092;同济大学岩土及地下工程教育部重点实验室, 上海 200092;同济大学土木工程防灾国家重点实验室, 上海 200092 |
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| 摘 要： | 通过二维离散元模拟斜坡地基静力触探试验,研究试验过程中锥尖阻力的变化以及斜坡地基的宏微观力学响应。结果表明:归一化锥尖阻力峰值在坡角较小时无明显提升,在坡角足够大时提升明显,稳定值随着坡角增大略微减小,说明斜坡边界对表层土力学性能影响明显,而对深层土影响较弱;锥尖贯入过程中,斜坡地基探杆两侧土体变形不对称,坡上一侧膨胀,坡下一侧压缩,不对称性随着坡角增大而增大;贯入到表层时,探杆两侧微观接触力链不对称,坡上一侧具有更大应力,但当贯入到深层时力链趋向于对称,其临界深度随着坡角增大而增大,与坡角呈近似线性关系。
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| 关 键 词： | 斜坡地基 静力触探试验 离散单元法 锥尖阻力 宏微观力学特性 |
| 收稿时间： | 2015/4/21 0:00:00 |
Discrete Element Method Analysis of Cone Penetration Tests on Sloping Ground |
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| PENG Di and JIANG Ming-jing.Discrete Element Method Analysis of Cone Penetration Tests on Sloping Ground[J].Northwestern Seismological Journal,2015,37(S1):57-62. |
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| Authors: | PENG Di and JIANG Ming-jing |
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| Institution: | Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China;State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China and Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China;State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China |
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| Abstract: | Much investigative work has been conducted on cone penetration tests on flat ground; however,research on cone penetration tests on slopping ground is scarce.Two-dimensional discrete element method simulation of cone penetration tests on sloping ground were performed,in which the tip resistance and micro-macro mechanical behavior of the cut slope was studied.The experimental results showed that the peak value of the normalized tip resistance does not increase when the slope angle is below a specific value,but increases when the slope angle is high.Nevertheless, the residual value decreases slightly with the increase of slope angle,indicating that the boundary of cut slope greatly affects the regolith,not the subsoil.As penetration proceeds,the deformation of the soil at the two sides of the cone is asymmetric with dilation on the upslope and compression on the downslope.This asymmetry increases with the slope angle.As the cone penetrates into the regolith,the force chains at different sides of the cone are asymmetric with higher stress on the upslope.However,as the penetration proceeds into the subsoil,the force chains tend to be symmetric.The critical depth of penetration symmetry increases with slope angle forming a linear relationship. |
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| Keywords: | slopping ground cone penetration test discrete element method core resistance macro-micro mechanical behavior |
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