• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>European conference on soil mechanics and geotechnical engineering >Base resistance of large diameter bored piles in soft rocks
【24h】

Base resistance of large diameter bored piles in soft rocks

机译：大直径钻孔桩在软岩中的基本电阻

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Instrumented pile tests are analysed in order to study the mobilisation of base resistance of bored cast in-place piles in weak rocks. Also analysed are the relevant geotechnical data comprising tri-axial, unconfined compression, standard penetration and point load tests. Measured base resistances are compared with theoretical calculations utilising four approaches: (ⅰ) undrained, (ⅱ) drained, (ⅲ) hybrid approach and (ⅳ) empirical correlation using in-situ soil test data. It is found that the development of base resistance is influenced by the following factors: (a) the degree of weathering and stiffness of the underlying soft rock, (b) the thickness and compressibility of any soil fragments existing beneath the pile base, and (c) the type of pile test and the rate of loading. Furthermore, the existence of compressible debris beneath a pile base results in a considerable reduction of the contribution of base resistance to the total pile head capacity. The mobilisation of maximum pile head resistance in weak rocks requires a substantial amount of settlement, which is typically 10%-20% of the pile diameter, but may be as high as 30% in the case of a pile base resting on soil debris. Based on the database analysed, a numerical model is developed for potential use in predicting the percentage composition of total head capacity in terms of shaft and base components. To allow practical application in pile design, the numerical model is formulated in terms of basic soil parameters which can be interpreted from the results of a conventional site investigation programme.
机译：仪表桩测试，以研究钻孔灌注桩原位桩软石的基极电阻的动员分析。也分析了包含三轴，无侧限压缩，标准渗透和点负载测试的相关数据土工。测量基础阻力与利用四种方法的理论计算进行比较：（ⅰ）不排水，（ⅱ）中被排出，（ⅲ）混合的方法和（ⅳ）使用原位土壤测试数据经验相关性。据发现，基极电阻的发展由以下因素的影响：（a）所述的风化和底层软岩的刚度的程度，（b）中存在的桩基础下的任何土壤片段的厚度和压缩性，和（ c）中桩测试的类型和装载率。此外，可压缩的碎片的存在在显着降低基极电阻的贡献与总桩头容量的桩基础结果下方。在软石最大桩头电阻的动员需要解决的相当量，通常是10％-20桩径的％，但是可以高达30％在一堆基搁在土壤碎片的情况下。基于分析的数据库上，数值模型是为潜在用途开发在预测轴和基组分的术语总头容量的百分比组成。为了使桩设计实际应用中，数值模型制定的，可以从传统的现场调查项目的结果进行解释基本的土壤参数方面。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号