| 蒋明镜, 黄佳佳, 刘阿森, 姜朋明.考虑率相关特性的深海软土锚板承载力数值分析[J].海洋工程,2025,(4):59~75 |
| 考虑率相关特性的深海软土锚板承载力数值分析 |
| Numerical analysis on the rate-dependent bearing capacity of plate anchors in deep-sea soft clay |
| 投稿时间：2024-05-03 |
| DOI：10.16483/j.issn.1005-9865.2025.04.006 |
| 中文关键词: 深海软土 锚板承载力 埋深率 锚板上拔速率 率相关性 |
| 英文关键词:deep-sea soft clay bearing capacity of plate anchor burial depth ratio uplift rate of plate anchor rate-dependent behavior |
| 基金项目:国家自然科学基金重点项目（52331010）；同济大学土木工程防灾国家重点实验室自主课题资助项目（SLDRCE19-A-06）；中国工程科技发展战略海南研究院重大咨询研究项目（21-HN-ZD-02-5） |
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| 中文摘要: |
| 随着近海资源的开采和消耗，深海逐渐成为未来资源开发利用的战略要地。锚板承载力的研究对于深海平台设计及其稳定性具有重要意义。基于中国南海北部陆坡区深海软土相关试验数据，采用适用于深海软土的弹黏塑性本构模型，建立有限元数值模型，研究了考虑率相关特性的深海软土锚板承载力。将数值模拟结果与理论解进行对比，分析了在深海软土中锚板不同埋深率、上拔速率与锚土接触情况对其承载力的影响，并对锚板周围土体位移、应力和黏塑性应变进行了分析。结果表明：1）锚板上拔极限承载力随着埋深率线性增加，随上拔速率增大而增大；锚土接触情况对深埋锚板的承载力影响较大，对浅埋锚板影响较小。2）当锚板埋深率较小时，锚板周围土体位移场受影响区域比较集中；当埋深率较大时，土体位移场受影响区域更大。3）锚板周围土体应力集中的区域主要在锚板端部上方，且埋深率越大，端部土体的应力越大。4）锚板埋深率较小时，土体黏塑性应变主要集中在锚板端部；埋深率较大时，土体黏塑性应变主要集中在锚板上方三角区域内。 |
| 英文摘要: |
| With the exploitation and depletion of resources in the shallow sea, the deep sea will become a strategic area in the future. Research on the bearing capacity of anchor plates is of great significance for the design and stability of deep-sea platforms. The bearing capacity of anchor plates is closely related to the uplift rate. Due to difficulties in sampling, obtaining valid experimental data, and determining the mechanical properties of soil, there is currently limited research on the rate-dependent bearing capacity of anchor plates in deep-sea sediment. Based on experimental data from deep-sea sediment in the northern slope area of the South China Sea, an elastic-viscoplastic constitutive model suitable for deep-sea sediment is employed to establish a finite element numerical model for the bearing capacity of a plate anchor in deep-sea sediment considering the rate-dependent behavior. The numerical results are compared with theoretical solutions. The influence of the burial depth ratio, uplift rate, and anchor-soil contact condition on the bearing capacity of anchor plates in deep-sea sediment is analyzed. The displacement, stress, and viscoplastic strain of the soil around the anchor plate are also investigated in detail. The research results indicate that: 1) The ultimate bearing capacity of the anchor plate increases linearly with the burial depth ratio and increases with the uplift rate. The anchor-soil contact condition has a significant influence on the bearing capacity of deeply buried anchor plates but has a smaller influence on shallowly buried anchor plates. 2) When the burial depth ratio is small, the affected area of soil displacement around the anchor plate is relatively concentrated, while the affected area becomes larger when the burial depth ratio is large. 3) The stress concentration area of the soil around the anchor plate is mainly located above the end of the anchor plate, and the greater the burial depth ratio, the greater the soil stress. 4) When the burial depth ratio is small, the soil viscoplastic strain is mainly concentrated at the end of the anchor plate, while it is mainly concentrated in the triangular area above the anchor plate when the burial depth ratio is large. |
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