基于动载试验结果的嵌岩预钻超强桩承载力分析

IF 0.4 Q4 ENGINEERING, GEOLOGICAL Journal of the Korean Geosynthetic Society Pub Date : 2019-01-01 DOI:10.12814/JKGSS.2019.18.3.089
Rak-Young Kim, Dongwook Kim
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引用次数: 1

摘要

基于动荷载试验结果,分析嵌岩预钻孔超强PHC (SSPHC)桩的承载力特征。由于SSPHC桩与普通高强度PHC桩相比具有较高的混凝土抗压强度,因此提高了SSPHC桩的许用结构强度。对于超强PHC桩的优化设计,还应提高SSPHC桩的岩土承载力,以平衡SSPHC桩允许结构强度的提高。目前的桩安装实践对SSPHC和高强度PHC桩采用相同的驱动能量。通过动载试验对SSPHC桩承载强度影响因素进行分析,发现桩头SPT-N值与桩端承载力之间没有关系。但驱动能量对端部承载力有影响。在表面摩擦的情况下,驱动能量没有影响。再冲击试验结果中未充分考虑端部承载力,有必要采用合理的方法验证设计承载力。
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Analysis of Bearing Capacity of Rock Socketed Pre-Bored Super Strength Piles Based on Dynamic Load Test Results
The purpose of this study is to analyze the characteristics of bearing capacity of pre-bored super strength PHC (SSPHC) piles socketed in rocks based on dynamic load test results. Because the SSPHC piles have high compressive concrete strengths compared with those of regular high strength PHC piles, the allowable structural strengths of the SSPHC piles were increased. For optimal design of the super strength PHC piles, the geotechnical bearing capacity of the SSPHC piles should also increased to balance the increased allowable structural strength of the SSPHC piles. Current practices of pile installation apply the same amount of driving energy on both SSPHC and high strength PHC piles. As results of analyzing factors that influence bearing strength of SSPHC piles using dynamic load test, there was no relationship between SPT-N value at pile toe and end bearing capacity. But driving energy effects on end bearing capacity. In case of skin friction, driving energy had no effects. And reasonable method verifying design bearing strength is necessary because end bearing capacity is not considered sufficiently in restrike test results.
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