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Characterization of strength and deformation properties of rock material for design of drilled shafts under lateral load.

机译：岩石材料的强度和变形特性的表征，用于侧向载荷下钻探轴的设计。

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摘要

One of the most challenging aspects of geotechnical engineering is the characterization of subsurface material. In practice, engineers often base recommendations both directly and indirectly on index properties and corresponding correlations and models. However, these models should be calibrated for site-specific conditions prior to being used as the basis for any substantial design.;This study includes details of a geotechnical case study. The objective of this study was to evaluate existing models used to estimate strength and deformation characteristics of intact rock and rock mass with respect to analyzing laterally loaded drilled shafts. Geological and geotechnical investigations were conducted for the given site. The field investigation employed sampling methods such as rock coring to obtain specimens that could be tested in the laboratory, as well as in-situ pressuremeter testing (PMT). Laboratory tests performed included uniaxial compression, point-load, Brazilian tension, rebound hardness, unit weight, and water content. The subsurface profile was shown to consist of alternating layers of claystone, limestone, and sandstone, overlain by a layer of clayey sand.;To develop a basis for evaluating existing models, the variability associated with strength and index properties was assessed. In addition, site-specific correlations were developed between uniaxial compressive strength ( qu) and the various index properties of the intact rock materials. The predictive capability of existing correlations to estimate qu based on index properties was examined. It was found that point-load index (Is(50)) provided the best estimate of qu among the index correlations studied. Additional rock mass correlations were evaluated on the basis of the strength and deformation characteristics derived from the PMT data. It was found that neither rock mass rating (RMR) nor geological strength index (GSI) produced reasonable estimates of rock mass deformation characteristics based on correlations examined.;The method used by the computer program LPILE to develop p-y curves for weak rock (Reese 1997) was evaluated in terms of how well the predicted p-y curves developed compared with those from PMT data. It was found that the weak rock model highly overestimated the stiffness of the rock mass for this particular site compared to stiffness estimated from the PMT results.
机译：岩土工程最具挑战性的方面之一是地下材料的表征。实际上，工程师通常直接或间接地基于索引属性以及相应的相关性和模型来提出建议。但是，在将这些模型用作任何实质性设计的基础之前，应针对特定地点的条件进行校准。;该研究包括岩土工程案例研究的详细信息。这项研究的目的是评估现有模型，该模型用于估计完整岩体和岩体的强度和变形特性，以分析侧向负载的钻探井筒。对该地点进行了地质和岩土调查。现场调查采用采样方法，例如取芯取芯，以获取可以在实验室进行测试的标本，以及现场压力计测试（PMT）。进行的实验室测试包括单轴压缩，点载荷，巴西拉力，回弹硬度，单位重量和水含量。地下剖面显示为由粘土岩，石灰岩和砂岩的交替层组成，上面覆盖着一层粘土砂。;为建立评估现有模型的基础，评估了强度和指数特性相关的变异性。此外，在单轴抗压强度（qu）与完整岩石材料的各种指标特性之间建立了特定位置的相关性。研究了现有相关性基于索引属性估算qu的预测能力。结果发现，点负荷指数（Is（50））在所研究的指数相关性中提供了qu的最佳估计。根据从PMT数据得出的强度和变形特征，评估了其他岩体的相关性。结果发现，根据检查的相关性，既没有岩体评级（RMR）也没有通过地质强度指数（GSI）得出合理的岩体变形特征估计值;计算机程序LPILE用于绘制弱岩py曲线的方法（Reese 1997 ）是根据预测的py曲线与来自PMT数据的预测py曲线的发展程度进行评估的。已发现，与根据PMT结果估算的刚度相比，该弱岩石模型高估了该特定地点的岩体的刚度。

著录项

  • 作者

    Timpson, Thomas Cawley.;

  • 作者单位

    The University of Utah.;

  • 授予单位 The University of Utah.;
  • 学科 Engineering Mechanical.
  • 学位 M.S.
  • 年度 2011
  • 页码 213 p.
  • 总页数 213
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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