光纤光栅传感技术在水下挤密砂桩挤密扩径研究中的应用

摘要

The FBG sensor technology was applied in underwater sand compaction pile sinking process to get the stress of pile, pile end resistance and acceleration test. Based on the test data analysis, we obtained the relationship between dynamic tip resistance and the calculation values of ultimate bearing capacity of single pile in the process of compacted expanding, and the compacted expanding later dynamic tip resistance changes with time, the dynamic relationship between end resistance and settlement rate, we put forward the suggestion for pile control standard in the compacted expanding process of underwater sand compaction pile, which has positive significance for improving the quality control of sand compaction pile.%将光纤光栅传感测试技术应用于水下挤密砂桩沉桩过程桩身应力、桩端阻力以及加速度测试，基于测试数据分析得到挤密扩径过程中动端阻力与理论计算单桩极限承载力的关系、挤密扩径后期动端阻力随时间的变化以及动端阻力与沉降速率的关系，提出水下挤密砂桩挤密扩径过程终桩控制标准的建议，对于提高挤密砂桩质量控制有积极意义。