【摘要】 海上风电机组附近的浅层气突涌运移可能会诱发基础的失稳破坏，为了解决该潜在工程问题，通过开展模型试验和数值模拟，研究不同静荷载作用下，软黏土中气体运移路径的演化规律以及其对基础稳定性的影响。研究结果表明：静荷载的形式和基础与注气点的相对位置影响气体运移路径。当基础作用下压荷载时，气体朝靠近基础的方向运移，可能诱发基础失稳；而当作用上拔荷载时，气体朝远离基础的方向运移，从而不会威胁到基础的安全，且基础与注气点的相对位置越近，这种效应越显著。开展扩展有限元和Cohesive黏聚力单元相结合的应力-渗流耦合分析，进一步研究此种效应，以期为海上风电机组基础选址和设计提供参考依据。更多还原

【Abstract】 The shallow gas inrush close to offshore wind turbine foundation may cause instability of foundation. Little research has been conducted on this potential engineering problem. The experiments and numerical simulation were implemented to study the evolution law of gas migration in soft clay exposed to different static load and explore its influence on the stability of foundation. Results show that gas migration paths are influenced by load cases and the relative positions between the injection point and foundation. When foundation is exposed to compressive load,gas migrates towards the foundation and it may lead to instability. While it exposed to tension load,gas migrates far away from foundation and poses no threat to safety of bucket foundation. In addition,the closer the relative position between the injection point and foundation is,the more significant this influence is. By combining Extended finite element method(XFEM)and cohesive zone method,coupled hydro-mechanical analysis was conducted to study this influence,which can provide advice for the site selection and the design of offshore wind turbine foundation.更多还原