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Preliminary Report on the Effect of Pre-Boring on the Mobilized Friction Capacity of Pile Foundation Hydraulically Jacked into Expansive Soil

机译:预钻孔对膨胀土液压桩基动员摩阻力影响的初步报告

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摘要

Pre-drilling was performed to reduce lateral earth pressure generated by pile foundation hydraulically jacked into expansive soil. Nineteen prestressed-precast spun concrete pile with diameter of 800 mm were penetrated into expansive soil up the depth of 40 m. Pre-drilling with diameter of 700 mm was carried out up to the depth of 12.5 m. Penetration loads required to install the piles, which was displayed on the built-in pressure panel, were recorded every 1 m interval. The load that was consisted of merely shaft friction was then used to find out the mobilized skin friction between pile shaft and its surrounding soils. The calculated mobilized skin friction was correlated to the value of Standard Penetration Test (NSPT) and compared to Decourt formula. The result shows that skin friction calculated using Decourt formula relatively conservative compared to those determined from the records of field penetration. The upper bound of mobilized skin friction can be defined by modifying Decourt formula.
机译:进行预钻是为了减少水力压入膨胀土中的桩基所产生的侧向土压力。将直径800 mm的19个预应力预制混凝土桩打入40 m深度的膨胀土中。进行直径为700 mm的预钻孔,直至深度12.5 m。每隔1 m记录一次安装桩所需的穿透载荷,该载荷在内置压力面板上显示。然后仅由杆身摩擦力组成的载荷被用于找出桩身杆身与其周围土壤之间的动员皮肤摩擦力。计算出的动员皮肤摩擦力与标准渗透测试(NSPT)的值相关,并与Decourt公式进行比较。结果表明,与根据野外穿透记录确定的摩擦相比,使用Decourt公式计算的皮肤摩擦相对保守。动员的皮肤摩擦的上限可以通过修改Decourt公式来定义。

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    Budi Gogot Setyo;

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  • 年度 2015
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