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Geotechnical Correlations for CPTu Site Investigation of Michigan Clays
Geotechnical Correlations for CPTu Site Investigation of Michigan Clays
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202103650
- ISBN
- 9798314875735
- DDC
- 620
- 서명/저자
- Geotechnical Correlations for CPTu Site Investigation of Michigan Clays
- 발행사항
- [Sl] : University of Michigan, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 447 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-11, Section: B.
- 주기사항
- Advisor: Garcia, F. Estefan T.;Hryciw, Roman D.
- 학위논문주기
- Thesis (Ph.D.)--University of Michigan, 2025.
- 초록/해제
- 요약Many Michigan clays are very sandy in composition which affects their engineering properties significantly. The Piezocone Penetration Test (CPTu) is used for subsurface exploration during the site investigation phase of a Civil Engineering project. Previous researchers have published correlations to various soil properties and parameters based on CPTu measurements, but many of these correlations have been shown to not perform well when evaluated against the Michigan sandy clays. The Michigan dataset includes a collection of pairs of CPTu soundings and adjacent companion soil borings from which samples were recovered and tested in the laboratory. Laboratory data for the total unit weight, organic content, moisture content, specific gravity of solids, preconsolidation pressure, virgin compression and recompression constrained moduli, and unconfined compression undrained shear strength were used to evaluate and empirically optimize CPTu-based correlations for Michigan clays. This work has concluded that Michigan clays have higher total unit weights compared to typical pure clays often referenced in literature. Two modified correlation equations were developed specifically for estimating the total unit weight of Michigan clays. Conversely, organic soils have much lower total unit weights as compared to all mineral soils. Most existing CPTu unit weight correlations have been developed specifically for mineral soils, therefore they overpredict the unit weight of organic soils such as peat, organic marl, and organic silt and clay. Two additional modified correlation equations were developed specifically for estimating the total unit weight of Michigan organic soils. This work also concluded that many existing soil behavior type (SBT) charts fail to identify the majority of organic soils in Michigan, incorrectly typing them as mineral clay. This is particularly important because the CPTu does not yield soil samples for verification. A collection of existing methods for organic soil identification were evaluated independently and in tandem with each other to identify the optimal combination of screening tools that identify the majority of organic soils in the Michigan dataset without overpredicting too many "false positive" results. Another conclusion of this work is that existing correlations based on the assumption of perfectly undrained behavior of clays, such as that for the overconsolidation ratio, does not perform well for Michigan sandy clays, likely because the significant sand content results in partial drainage during cone penetration. A modified version of this correlation has been empirically developed to yield better agreement with the laboratory results. Furthermore, review of the literature suggested that existing CPTu-based correlations for the constrained modulus are limited to providing only the modulus associated with the in-situ consolidation state of the soil. Two modified correlation equations were developed such that both the virgin compression and the recompression moduli may be estimated regardless of the in-situ consolidation state of the soil. Lastly, this work demonstrated that the undrained shear strength of a Michigan clay can be estimated using both the CPTu net cone tip resistance as well as the apparent overconsolidation ratio. A modified correlation equation has therefore been developed to add the dependency on the overconsolidation ratio.
- 일반주제명
- Engineering
- 일반주제명
- Geotechnology
- 키워드
- Michigan clays
- 기타저자
- University of Michigan Civil Engineering
- 기본자료저록
- Dissertations Abstracts International. 86-11B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■020 ▼a9798314875735
■035 ▼a(MiAaPQ)AAI32092686
■035 ▼a(MiAaPQ)umichrackham006006
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a620
■1001 ▼aChampagne, Cassandra.
■24510▼aGeotechnical Correlations for CPTu Site Investigation of Michigan Clays
■260 ▼a[Sl]▼bUniversity of Michigan▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a447 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-11, Section: B.
■500 ▼aAdvisor: Garcia, F. Estefan T.;Hryciw, Roman D.
■5021 ▼aThesis (Ph.D.)--University of Michigan, 2025.
■520 ▼aMany Michigan clays are very sandy in composition which affects their engineering properties significantly. The Piezocone Penetration Test (CPTu) is used for subsurface exploration during the site investigation phase of a Civil Engineering project. Previous researchers have published correlations to various soil properties and parameters based on CPTu measurements, but many of these correlations have been shown to not perform well when evaluated against the Michigan sandy clays. The Michigan dataset includes a collection of pairs of CPTu soundings and adjacent companion soil borings from which samples were recovered and tested in the laboratory. Laboratory data for the total unit weight, organic content, moisture content, specific gravity of solids, preconsolidation pressure, virgin compression and recompression constrained moduli, and unconfined compression undrained shear strength were used to evaluate and empirically optimize CPTu-based correlations for Michigan clays. This work has concluded that Michigan clays have higher total unit weights compared to typical pure clays often referenced in literature. Two modified correlation equations were developed specifically for estimating the total unit weight of Michigan clays. Conversely, organic soils have much lower total unit weights as compared to all mineral soils. Most existing CPTu unit weight correlations have been developed specifically for mineral soils, therefore they overpredict the unit weight of organic soils such as peat, organic marl, and organic silt and clay. Two additional modified correlation equations were developed specifically for estimating the total unit weight of Michigan organic soils. This work also concluded that many existing soil behavior type (SBT) charts fail to identify the majority of organic soils in Michigan, incorrectly typing them as mineral clay. This is particularly important because the CPTu does not yield soil samples for verification. A collection of existing methods for organic soil identification were evaluated independently and in tandem with each other to identify the optimal combination of screening tools that identify the majority of organic soils in the Michigan dataset without overpredicting too many "false positive" results. Another conclusion of this work is that existing correlations based on the assumption of perfectly undrained behavior of clays, such as that for the overconsolidation ratio, does not perform well for Michigan sandy clays, likely because the significant sand content results in partial drainage during cone penetration. A modified version of this correlation has been empirically developed to yield better agreement with the laboratory results. Furthermore, review of the literature suggested that existing CPTu-based correlations for the constrained modulus are limited to providing only the modulus associated with the in-situ consolidation state of the soil. Two modified correlation equations were developed such that both the virgin compression and the recompression moduli may be estimated regardless of the in-situ consolidation state of the soil. Lastly, this work demonstrated that the undrained shear strength of a Michigan clay can be estimated using both the CPTu net cone tip resistance as well as the apparent overconsolidation ratio. A modified correlation equation has therefore been developed to add the dependency on the overconsolidation ratio.
■590 ▼aSchool code: 0127.
■650 4▼aEngineering
■650 4▼aGeotechnology
■653 ▼aGeotechnical engineering
■653 ▼aSite investigation
■653 ▼aPiezocone Penetration Test
■653 ▼aMichigan clays
■690 ▼a0543
■690 ▼a0537
■690 ▼a0428
■71020▼aUniversity of Michigan▼bCivil Engineering.
■7730 ▼tDissertations Abstracts International▼g86-11B.
■790 ▼a0127
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358145▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
