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原文传递 CHARACTERIZATION OF THE SUBGRADE SOILS AT THE MINNESOTA ROAD RESEARCH PROJECT. INTERIM REPORT.

题名：	CHARACTERIZATION OF THE SUBGRADE SOILS AT THE MINNESOTA ROAD RESEARCH PROJECT. INTERIM REPORT.
作者：	Newcomb-DE; Van-Deusen-DA; Burnham-TR
关键词：	SUBGRADES-; EMBANKMENTS-; SOIL-CHARACTERISTICS; DESTRUCTIVE-TESTING; NONDESTRUCTIVE-TESTING; FALLING-WEIGHT-DEFLECTOMETERS; SOIL-SAMPLING; CONE-PENETRATION-TESTS; BACKCALCULATION-; MODULUS-OF-ELASTICITY-SOIL; MODULUS-OF-RESILIENCE
摘要：	A soil sampling and testing program was conducted on the pavement embankment at the Minnesota Road Research Project during different stages of construction. The objective of the study was to characterize the embankment and granular base soils. Both destructive and nondestructive approaches were taken. Nondestructive load tests were conducted using a falling-weight deflectometer and both disturbed and undisturbed soil samples were retrieved. Falling-weight deflectometer tests were conducted at regular intervals along three different offsets on the embankment. A large diameter plate was used with modest load levels. Other data obtained during the testing program included jar, bag, and thin-walled soil samples, and dynamic cone penetrometer soundings. The falling-weight deflectometer load and deflection data were used to backcalculate the elastic moduli for both a homogeneous and multi-layered system. The variability of the deflections and estimated moduli were addressed using both general statistics and geostatistical analyses. It was found that the measured deflections were highly variable due to surface irregularities such as ruts, cracks, and loose compressible material, as well as soil moisture content and density variations. The backcalculated moduli computed from the inner sensor deflections were lower and more variable than those from the outer sensors. Laboratory resilient modulus tests conducted on the thin-walled samples yielded values that compared well with the backcalculated values from the outermost sensors.
总页数：	1994/06. pp149 (68 Fig., 7 Tab., 14 Ref., 1 App.)
报告类型：	科技报告