AN INVESTIGATION OF THE SHAFT AND BASE RESISTANCE OF LARGE BORED PILES IN LONDON CLAY
AN INVESTIGATION OF THE SHAFT AND BASE RESISTANCE OF LARGE BORED PILES IN LONDON CLAY
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伦敦粘土中大型钻孔桩的竖井和基础阻力的研究
DOI：
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发表时间：
1966
期刊：
影响因子：
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通讯作者：
R. Cooke
中科院分区：
文献类型：
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作者：
T. Whitaker;R. Cooke
本文介绍了在伦敦粘土中的深钻孔圆柱基础上进行的荷载试验结果。由于伦敦粘土是裂隙，现场调查钻孔样品的强度试验结果存在相当大的差异。试验表明，极限承载力公式中使用的系数必须与强度值的解释方式有关。当基础沉降时，轴摩擦力比基础的承载阻力更快地衰减。安全系数与此相关，并提出了一种设计方法，用于限制沉降，该方法基于应用于摩擦和基础阻力组件的相互关联的荷载系数。这些因素是从测试结果中经验性地推导出来的。混凝土浇筑前基础的钻孔和清洁方式对基础的性能有重大影响，分析仅限于表现出一致性能的基础。调查不涉及成组地基，也不考虑因固结而引起的沉降。联系我们
THIS PAPER PRESENTS THE RESULTS OF LOADING TESTS ON DEEP BORED CYLINDER FOUNDATIONS IN LONDON CLAY IN WHICH LOAD CELLS WERE INSTALLED AT THE BOTTOM OF THE SHAFTS TO MEASURE THE LOADS CARRIED BY THE BASES. SINCE THE LONDON CLAY IS FISSURED THERE IS CONSIDERABLE VARIATION IN THE RESULTS OF STRENGTH TESTS ON BOREHOLE SAMPLES FROM A SITE INVESTIGATION. TESTS SHOW THAT THE FACTORS USED IN A FORMULA FOR ULTIMATE BEARING CAPACITY MUST BE RELATED TO THE MANNER IN WHICH THE STRENGTH VALUES ARE INTERPRETED. AS THE FOUNDATIONS SETTLE, THE SHAFT FRICTION DEVELOPS MORE RAPIDLY THAN THE BEARING RESISTANCE OF THE BASE. SAFETY FACTORS ARE DISCUSSED IN RELATION TO THIS AND A DESIGN METHOD IS PROPOSED FOR THE LIMITATION OF SETTLEMENT BASED ON THE USE OF INTER-RELATED LOAD FACTORS APPLIED TO THE FRICTIONAL AND BASE COMPONENTS OF RESISTANCE. THESE FACTORS ARE DERIVED EMPIRICALLY FROM THE TEST RESULTS. THE WAY IN WHICH THE DRILLING AND CLEANING OF THE FOUNDATIONS BEFORE CONCRETING ARE CARRIED OUT HAS A MAJOR EFFECT ON THE BEHAVIOR OF THE FOUNDATIONS AND THE ANALYSIS HAS BEEN CONFINED TO THOSE SHOWING A CONSISTENT PERFORMANCE. THE INVESTIGATION DOES NOT DEAL WITH FOUNDATIONS IN GROUPS, NOR DOES IT TAKE ACCOUNT OF SETTLEMENT DUE TO CONSOLIDATION. /AUTHOR/