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采用尼龙棒作为模型桩,首次在桩身刻槽封装微型FBG应变传感器和微型孔隙水压力传感器,对模型桩贯入过程中轴力和孔隙水压力的发展变化进行测试,研究黏性土中的静压桩荷载传递机制。试验结果表明:尼龙棒作为模型桩是可行的,贯入过程中,微型FBG应变传感器和微型孔压传感器性能稳定,能精确测出沉桩过程中桩身轴力变化和桩土界面处孔隙水压力的变化;在黏性土中,超孔隙水压力影响沉桩阻力和桩身轴力变化,土中产生的超孔隙水压力呈线性增长,达到最大值后,开始缓慢消散;桩在贯入初期,桩端处FBG传感器未出现波长变化,直至贯入有效桩长的1/14~1/8后,才出现轴力变化。试验结果可为桩基础的设计、施工与检测提供借鉴与参考。
Using a nylon rod as a model pile, a miniature FBG strain sensor and a micro pore water pressure sensor are firstly packaged in the pile body to test the development and change of axial force and pore water pressure during the penetration of the model pile, and to study the Static pile load transfer mechanism. The test results show that the nylon rod is feasible as a model pile. In the penetration process, the micro FBG strain sensor and the micro pore pressure sensor have stable performance, and can accurately measure the axial force variation and the pore water at the pile-soil interface during the pile driving. Changes in pressure; In cohesive soils, the excess pore water pressure affects the resistance of the pile and the axial force of the pile body, and the excess pore water pressure in the soil increases linearly. After reaching a maximum value, it slowly dissipates; In the initial stage, there was no wavelength change in the FBG sensor at the end of the pile, and no axial force change occurred until 1/14 to 1/8 of the effective pile length. The test results can provide reference and reference for the design, construction and testing of pile foundations.