水合物分解中深水基础抗拔性能模型试验研究  

Physical Model Tests on Uplift Capacity of a Deep‑Water Foundation in Hydrate‑Bearing Sediment During Hydrate Dissociation

作　　者：刘芳[1,2] 冯馨 孙皓宇 张旭辉[3] LIU Fang;FENG Xin;SUN Haoyu;ZHANG Xuhui(State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China;Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;Institute of Mechanics,Chinese Academy of Science,Beijing 100190,China)

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092 [2]同济大学土木工程学院地下建筑与工程系,上海200092 [3]中国科学院力学研究所,北京100190

出　　处：《防灾减灾工程学报》2023年第2期359-365,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：深海能源土桩基承载特性的宏微观机理研究(41572267)资助。

摘　　要：我国正在推进天然气水合物开发的产业化进程,海域水合物大规模开采可能影响临近深水设施的基础承载性能,进而诱发工程事故和环境风险。采用室内缩尺物理模型试验,模拟海域水合物的开采分解以及临近锚板基础的承载性能变化过程,测试了基础在不同水合物分解程度下的抗拔性能。试验结果表明,邻近锚板基础的抗拔性能在水合物分解过程中变化显著,随着分解阵面的扩展,分解程度提高,基础的抗拔承载力急剧降低;水合物完全分解后抗拔力下降为未分解时的2.89‰,水合物分解中抗拔力折减程度与分解锋面相对距离之间拟合呈现正相关函数关系,拉拔破坏由脆性转为塑性破坏。China is accelerating the industrialization of natural gas hydrate exploitation.However,large-scale commercial exploitation of marine hydrate may affect the bearing capacity of deep-water foundations and in turn induce engineering accidents and environmental risks.Adopting the indepen‐dent improved physical model test system,a physical simulation experiment was conducted to simu‐late the exploitation and dissociation process of hydrate,and the pullout performance of an anchor foundation under different degrees of dissociation was studied.The results show that with the expan‐sion of the dissociation front,the degree of dissociation increases,and pull-out bearing capacity of the foundation reduces sharply.After complete dissociation of hydrate,the bearing capacity of the plate anchor decreases to 2.89‰of that before dissociation.A positive correlation was found between the degree of the pullout capacity reduction and the relative distance of the dissociation fronts,while the pullout failure changes from brittle to plastic.

关 键 词：水合物开采 深水基础 抗拔承载力 

分 类 号：TE37[石油与天然气工程—油气田开发工程]