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首页> 外文期刊>Journal of bridge engineering >Effects of Construction Technology on Bearing Behaviors of Rock-Socketed Bored Piles as Bridge Foundations
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Effects of Construction Technology on Bearing Behaviors of Rock-Socketed Bored Piles as Bridge Foundations

机译：施工工艺对嵌岩钻孔桩作为桥梁基础的承载特性的影响

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Construction technology has a considerable impact on the bearing behavior of bridge pile foundations. Considering practical bridge engineering, this study examined the mechanical characteristics of rock-socketed bored piles under different pile-forming methods using a self-balanced load test and explored the postgrouting effect on the load capacity of the piles. The results indicated that the dry rotary drilling pile method was conducive to ensuring the bearing strength of rock-socketed bored piles in bridge foundations, whereas the mud rotary drilling pile method significantly reduced the shaft resistance of rock-socketed bored piles as well as the pile-end resistance. The mud rotary drilling pile method also increased the settlement from the negative impact of sediment and the softening of carbonaceous shale. The postgrouting technique can effectively enhance the unit-shaft and end resistance of the rock-socketed bored pile and reduce its settlement by approximately 42 and 100% bearing capacity increment compared with dry and mud rotary drilling piles, respectively. Under their respective ultimate loads, the settlements also decreased by 37.5 and 54.4%. The postgrouting technique had a tremendous impact on the proportion of the end resistance to the shaft resistance, markedly increasing the end resistance for mud rotary drilling piles. These results provide an important reference for the design and construction of rock-socketed bored piles with a large diameter and length in bridge foundations. (c) 2019 American Society of Civil Engineers.
机译：施工技术对桥梁桩基础的承载性能有很大影响。考虑到实际的桥梁工程，本研究通过自平衡载荷试验研究了在不同桩形成方法下的嵌岩钻孔桩的力学特性，并探讨了后灌浆对桩的承载能力的影响。结果表明，干式旋挖桩法有利于保证嵌岩钻孔桩在桥梁基础上的承载力，而泥浆旋挖桩法显着降低了嵌岩钻孔桩和桩的竖向阻力。端电阻。泥浆旋转钻桩法还增加了由于泥沙的负面影响和碳质页岩软化而引起的沉降。后置注浆技术可以有效地提高嵌岩钻孔桩的单位竖井和端部阻力，并且与干式和泥浆旋转钻孔桩相比，分别减少大约42％和100％的承载力增量。在各自的极限荷载下，沉降量也减少了37.5％和54.4％。后注浆技术对端部阻力与竖井阻力的比例产生了巨大影响，显着增加了旋挖钻机泥浆的端部阻力。这些结果为桥梁基础中直径较大，长度较大的嵌岩钻孔桩的设计和施工提供了重要参考。 （c）2019美国土木工程师学会。

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