Initial and Evolving Stress-Strain Anisotropy of Sedimented Clay
{'Code': '07030000', 'Directorate': {'LongName': 'Directorate For Engineering'}, 'Division': {'LongName': 'Div Of Civil, Mechanical, & Manufact Inn'}}
{'SignBlockName': 'LaTanya S. Darby'}
The design of structures on cohesive soils requires a quantitative              understanding of the clay-structure interactions under anisotropic              stress-strain conditions.  This research develops experimental methods          to determine the effects of anisotropy in clays.  Rational analyses of          complex clay-structure interaction problems (mat foundations, braced            excavations, tunnels, etc.) are not feasible without adequate data on           undrained and drained response of clay deposits.  This study develops a         "generalized" constitutive relationship incorporating the stress-strain         anisotropy.  This research uses a unique Directional Cell (DSC) device          to fully control the major principal stress direction by varying the            normal and shear stresses and acting on four faces of a cubical soil            sample.  The study employs both undrained and drained testing at                varying overconsolidaiton ratios and determines how "initial"                   anisotropy of consolidated clays change due to subsequent straining             that causes plastic deformations.
[{'FirstName': 'Charles', 'LastName': 'Ladd', 'EmailAddress': None, 'StartDate': '07/01/1986', 'EndDate': None, 'RoleCode': 'Principal Investigator'}, {'FirstName': 'John', 'LastName': 'Germaine', 'EmailAddress': 'jgermain@mit.edu', 'StartDate': '07/01/1986', 'EndDate': None, 'RoleCode': 'Co-Principal Investigator'}]
{'Name': 'Massachusetts Institute of Technology', 'CityName': 'Cambridge', 'ZipCode': '021394301', 'PhoneNumber': '6172531000', 'StreetAddress': '77 MASSACHUSETTS AVE', 'CountryName': 'United States', 'StateName': 'Massachusetts', 'StateCode': 'MA'}
[{'Code': '1441', 'Text': 'MECHANICS'}, {'Code': '1448', 'Text': 'GEOTECHNICAL I'}]
{'url': 'https://www.nsf.gov/awardsearch/download?DownloadFileName=1986&All=true', 'xml': '8600566.xml'}