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为研究工作荷载作用下,摩擦型桩(端承摩擦桩和摩擦桩)在腐蚀地基中发生表面劣化时的沉降特性,通过制作以硫酸铜溶液为腐蚀性介质的饱和砂土地基模型,开展了加速劣化试验,得到工作荷载作用下摩擦型桩表面发生劣化时的沉降规律.结果表明:腐蚀地基中,桩表面劣化程度随时间不断增大,沉降量随劣化程度的增大而增大;端承摩擦桩和摩擦桩的荷载-沉降曲线发展规律不同;在工作荷载作用下,经过17 360 min,端承摩擦桩的沉降量达到桩径的28.5%,其中表面劣化引起的沉降量为10.6%,大于摩擦桩的7%;试验结束时,端承摩擦桩和摩擦桩的沉降量均达到了各自极限承载力对应的沉降量.表面劣化导致摩擦型桩的沉降量显著增加,表面劣化引起的附加沉降可能影响桩的正常使用.
In order to study the settlement characteristics of the friction pile (end bearing friction pile and friction pile) when the surface degradation occurs in the corrosion foundation under the action of working load, a saturated sand soil foundation model using copper sulfate solution as a corrosive medium was developed The results show that the degree of surface degradation of piles increases with time and the settlement decreases with the increase of the degree of deterioration. The load-settlement curve of bearing friction pile and friction pile has different development regularity. Under the action of working load, after 17 360 min, the settlement of end bearing friction pile reaches 28.5% of pile diameter, of which the settlement caused by surface degradation is 10.6% , Which is larger than 7% of the friction pile. At the end of the experiment, the settlement of the end bearing friction pile and the friction pile reached the settlement corresponding to the ultimate bearing capacity of each pile, the settlement of the friction pile increased obviously and the surface degradation Additional settlement may affect the normal use of the pile.