Abstract
Field measurements of settlement and lateral deformation obtained from three deep excavation sites constructed in mixed ground profiles are presented and analyzed. Settlement measurements were obtained throughout the construction process, categorized in three stages as: (1) preexcavation (i.e., preliminary site work and support wall installation); (2) main excavation and bracing/anchor installation; and (3) postexcavation (i.e., removal of bracing as basement construction proceeds). Maximum preexcavation stage settlements of 0.03% Hw to 0.06% Hw (where Hw =wall or trench depth) were measured at two sites, with the maximum settlements occurring adjacent to the wall during its installation. Maximum ground surface settlements during the main excavation stage ranged from about 0.15% He to 0.30% He (where He =final excavation depth) and the distribution of ground settlement extended to a distance of 1.5 He to 2.0 He from the wall. Maximum settlements occurred at distances of about 0.3 He to 0.5 He from the wal...
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