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基于室内模型试验,研究透水管桩促进桩周土超静孔压消散的效果和规律。通过透水管桩和普通管桩单桩沉桩模型试验对比,发现使用透水管桩更有利于桩周土超静孔压消散,其促进作用沿深度方向递增,沿水平方向递减。在桩周土超静孔压消散前期,透水管桩的促进作用最明显,有利于加快施工进度。改变透水管桩初始排水时刻,观察桩周土超静孔压消散情况,发现初始排水时刻设在沉桩完成时的情况下,桩周土超静孔压峰值明显减小。试验结果表明,沉桩施工中,透水管桩提高了施工进度,降低了对周围环境的影响。
Based on the indoor model test, the effects and rules of pervious pipe piles in promoting the dissipation of excess pore water pressure around the pile were studied. Through comparison of single-pile model test of pervious pipe piles and common pipe piles, it is found that the use of pervious pipe piles is more conducive to the dissipation of the excess static pore pressure in the soil around the pile, and its accelerating effect increases along the depth direction and decreases along the horizontal direction. In the early stage of dissipating the excess static pore pressure of the soil around the pile, the pervious pipe pile has the most obvious promoting effect, which is helpful for speeding up the construction progress. The initial drainage time of pervious pipe piles was changed to observe the dissipation of the excess static pore pressure around the pile. It was found that the initial drainage time was set when the pile was completed and the peak static pore pressure of the soil around the pile was significantly reduced. The test results show that, during the construction of piles, pervious pipe piles improve the construction schedule and reduce the impact on the surrounding environment.