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Amount of Uncertainty in the Methods Utilized to Design Drilled Shaft Foundations.

机译：用于设计钻孔竖井基础的方法中的不确定性。

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摘要

In 2001, load and resistance factor design (LRFD) for deep foundations was required by the American Association of State Highway and Transportation Officials (AASHTO). Following implementation of LRFD, localized calibration of resistance factors using data from the states of Colorado, Florida, Kansas, Louisiana/Mississippi, Missouri allowed these states to utilize higher resistance factors during design. However, characterizing the uncertainty in the design of DSF, regarding the geotechnical investigation methods and the utilized software programs, higher values of resistance factors may be calibrated to more efficiently design DSF with the same level of reliability.;Three test sites within the state of Arkansas, identified as the Siloam Springs Arkansas Test Site (SSATS), the Turrell Arkansas Test Site (TATS), and the Monticello Arkansas Test Site (MATS), were utilized to perform full-scale load tests on DSF. At each site, three geotechnical investigation methods (Arkansas State Highway and Transportation Department [AHTD], Missouri Department of Transportation [MODOT], and the University of Arkansas [UofA]) were utilized to obtained geotechnical parameters. The design of three DSF, at each site, was then performed, and the amount of resistance was predicted, using commercially available software (FB-Deep and SHAFT). At each site, the results obtained from bi-directional load tests were compared with the predicted values and the construction methods and problems (i.e. rock embedment length at the SSATS, collapsed excavation at the TATS, and equipment failure/concrete placement at the MATS) are presented herein.;Two site-specific and a geologic-specific calibrations were performed by utilizing the results from the bi-directional load tests that were performed in Arkansas, the Bayesian updating, and the Monte Carlo simulation techniques. For each geotechnical investigation method and for each software program that was utilized during the DSF design, posterior distribution parameters were calculated based on previous calibration databases (i.e. the national database or the Louisiana/Mississippi database). Resulting resistance factor values were calculated for the geologic-specific mixed soils within the state of Arkansas. The calculated resistance factors ranged from 0.57 to 0.80 for total resistance. Furthermore, the FB-Deep software program is recommended in conjunction with the MODOT or UofA geotechnical investigation methods to design of DSF in Arkansas.
机译：2001年，美国国家公路和运输官员协会（AASHTO）要求用于深层基础的荷载和阻力系数设计（LRFD）。实施LRFD后，使用来自密苏里州科罗拉多州，佛罗里达州，堪萨斯州，路易斯安那州/密西西比州，密苏里州的数据对电阻系数进行了局部校准，从而允许这些州在设计时利用较高的电阻系数。但是，为了表征DSF设计中的不确定性，关于岩土勘查方法和所使用的软件程序，可以对较高的电阻系数值进行校准，以在相同的可靠性水平下更有效地设计DSF。被确定为Siloam Springs阿肯色州测试站点（SSATS），Turrell阿肯色州测试站点（TATS）和Monticello阿肯色州测试站点（MATS）的阿肯色州用于对DSF进行全面的载荷测试。在每个站点，使用了三种岩土勘测方法（阿肯色州公路和运输部[AHTD]，密苏里州交通运输部[MODOT]和阿肯色大学[UofA]）来获取岩土参数。然后使用市售软件（FB-Deep和SHAFT）在每个位置进行三个DSF的设计，并预测电阻量。在每个站点上，将从双向载荷测试中获得的结果与预测值以及施工方法和问题（即SSATS处的岩石埋深，TATS处的塌方开挖以及MATS处的设备故障/混凝土放置）进行比较。通过利用在阿肯色州进行的双向载荷测试，贝叶斯更新和蒙特卡洛模拟技术的结果，进行了两个特定于现场的校准和特定于地质的校准。对于DSF设计过程中使用的每种岩土勘查方法和软件程序，均基于先前的校准数据库（即国家数据库或路易斯安那州/密西西比州数据库）计算后验分布参数。计算了阿肯色州内特定地质混合土的抵抗系数值。对于总电阻，计算得出的电阻系数范围为0.57至0.80。此外，建议将FB-Deep软件程序与MODOT或UofA岩土技术调查方法结合使用，以设计阿肯色州的DSF。

著录项

  • 作者

    Race, Morgan.;

  • 作者单位

    University of Arkansas.;

  • 授予单位 University of Arkansas.;
  • 学科 Civil engineering.;Geological engineering.
  • 学位 Ph.D.
  • 年度 2015
  • 页码 323 p.
  • 总页数 323
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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