基于光频域反射技术的雪花形钢板桩抗拔试验研究

利用光频域反射技术，开展了雪花形钢板桩抗拔模型试验，获得了钢板桩在上拔过程中桩身不同处的应变和不同距离处的土体水平位移。试验结果表明：光频域反射技术能够准确监测雪花形钢板桩上拔过程中桩身的变形特征，揭示桩身不同处的变形规律；雪花形钢板桩在上拔过程中桩身不同位置应变大小和波动不同，在腹板与腹板交界处最小，翼缘边处最大；结果显示雪花形钢板桩在上拔过程中，桩周土体水平位移随上拔荷载的增大而增大，距模型桩200 mm处土体水平位移约为100 mm处的19.15%。

Test Study on Uplift of Snowflake Steel Sheet Pile Based on Optical Frequency Domain Reflection Technology

Snowflake shaped steel sheet pile is a new type of special-shaped pile with large specific surface areas and high bearing capacities while saving materials. In this paper, the optical frequency domain reflectance (OFDR) technology is used to carry out the uplift model test of snowflake steel sheet piles, and the strain at different positions of the pile body and the horizontal displacement of soil at di-fferent distances during the uplift process of the steel sheet piles are obtained. The test results show that OFDR can accurately monitor the deformation characteristics of the snowflake steel sheet pile during the process of uplift, and reveal the deformation laws of different parts of the pile body. The strain magnitude and fluctuation of the snowflake steel sheet pile are different at different positions of the pile body during the process of uplift, the strain of junction of the web is the smallest and the strain of the flange edge is the largest. The results show that the horizontal displacement of the soil around the snowflake steel sheet pile increases with the increase of the load during the uplift process, the horizontal displacement of the soil at 200 mm from the model pile is about 19.15% of the soil at 100 mm.