| 谢振宇,刘宜胜,张国堙,施榕俊.基于离散元的原位探杆结构对侧摩阻力影响研究[J].矿产勘查,2025,16(6):1463-1473 |
| 基于离散元的原位探杆结构对侧摩阻力影响研究 |
| Discrete element study on the impact of in-situ probe rod structures on side friction resistance |
| 投稿时间：2024-07-05 |
| DOI：10.20008/j.kckc.202506015 |
| 中文关键词: 原位试验 侧摩阻力 探杆结构 离散元法 |
| 英文关键词: in-situ test side friction probe structure discrete element method |
| 基金项目:本文受浙江省重点研发计划项目“海底沉积层综合物性原位测试关键技术研发及应用示范”(2021C03016)资助。 |
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| 中文摘要: |
| 原位试验是岩土性质评估中广泛采用的方法之一。在原位试验中，测量传感器安装于侧壁的传统等径原位探杆在实际工况中，可能因为过大的侧摩阻力导致传感器在多次贯入试验后损坏或失效。为研究在相同土体性质下原位探杆结构变化对侧摩阻力值的影响，本研究运用离散元法构建砂土模型，设计 3种不同结构类型(等径探杆、凸结构探杆、凹结构探杆)的原位探杆模型，对比分析 3根探杆贯入和提升过程中侧摩阻力和接触力等相关力学结果。研究结果表明:锥形原位探杆中的膨胀面结构(直径由小变大)显著增加了其自身及后端紧邻侧壁位置的侧摩阻力，但降低了其前端侧壁位置的侧摩阻力；收缩面结构(直径由大变小)使其自身及后端紧邻侧壁位置成为侧摩阻力最小区域，可使侧摩阻力值减小达 96%；上述 2种结构调整对探杆的锥尖阻力产生影响较小(低于 3%)，因此可考虑改变原位探杆结构，并将侧壁传感器安装在探杆收缩面结构的后端或膨胀面结构的前端，从而减少侧摩阻力对测量传感器的损伤。 |
| 英文摘要: |
| In-situ testing is one of the widely adopted methods for evaluating geotechnical properties. In suchtests, traditional cylindrical in-situ probe rods with side-wall mounted sensors might experience significant sidefriction, potentially leading to sensor damage or failure after multiple penetration tests. To investigate the impact ofin-situ probe rod structure variations on side friction under identical soil conditions, this study employed the dis.crete element method (DEM) to construct a sand model and designed three different types of in-situ probe rod struc.tures (cylindrical, convex, and concave). By comparing the mechanical results of side friction and contact forces dur.ing the penetration and retraction processes of these three probe rods, the study revealed that the expansion surfacestructure (diameter increasing from small to large) in the conical in-situ probe rod had significantly increased sidefriction on its own and the adjacent rear side-wall area while it had reduced side friction at the front side-wall area.Conversely, the contraction surface structure (diameter decreasing from large to small) minimized side friction in itsown and the adjacent rear side-wall area, reducing side friction by up to 96%. Both structural adjustments had mini.mal impact on the probe rod’s tip resistance (less than 3%). Therefore, modifying the in-situ probe rod structureand installing side-wall sensors at the rear end of the contraction surface or the front end of the expansion surfacecould reduce side friction damage to the sensors. |
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