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为降低施工难度、节省费用,对原设计采用的中风化泥质粉砂岩持力层进行调整,对调整后的砾砂持力层进行桩端注浆,以提高单桩竖向抗压承载力,经静载试验检测,承载力超过原设计以中风化泥质粉砂岩作持力层时设计要求的单桩竖向抗压承载力特征值,同时桩长缩短了约14m,经持力层桩端注浆优化后经济效益显著,与原设计相比单根桩能够节省成本5 208元。
In order to reduce the construction difficulty and save the cost, the neutralized muddy siltstone bearing strata used in the original design was adjusted, and the adjusted gravel sand holding layer was grouted to enhance the vertical compressive bearing capacity of the pile , After static load test, the bearing capacity exceeds the characteristic value of the vertical compressive bearing capacity of the single pile required by the design of the middle-weathered argillaceous siltstone as the holding layer, and the length of the pile is shortened by about 14m. The pile end grouting optimization has obvious economic benefits. Compared with the original design, the single pile can save 5,208 yuan.