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原文传递 CHARACTERIZATION OF SUBGRADE SOILS AT SIMULATED FIELD MOISTURE.

题名：	CHARACTERIZATION OF SUBGRADE SOILS AT SIMULATED FIELD MOISTURE.
作者：	Thadkamalla-GB; George-KP
关键词：	SUBGRADES-; MOISTURE-CONTENT; SATURATION-; MODULUS-OF-RESILIENCE; WETTING-; COARSE-GRAINED-SOILS; FINE-GRAINED-SOILS; DEGREE-OF-SATURATION; TEST-RESULTS
摘要：	It is important to assess the strength characteristics of subgrade soils at equilibrium moisture content (EMC), generally a few percentage points wet of optimum moisture content (OMC). Investigation of the effect of saturation--degree and mode--above OMC on the resilient modulus (M sub R) of laboratory compacted subgrade soils is the topic of this paper. Three modes of saturating (wetting) are investigated: (a) capillary saturating, (b) vacuum saturating, and (c) molding wet of optimum. EMC and 96% saturation are the two different degrees of saturation considered. The M sub R of soil samples, both coarse- and fine-grain, are evaluated for different combinations of degree of saturation and saturating mode. The test results indicate that the degree of saturation above OMC has a nominal effect (20%) on M sub R of coarse-grain soils, whereas it has a severe effect (50 to 75% decrease) on the M sub R of fine-grain soils. Another finding is that both degree of saturation and saturating mode affect the M sub R of fine-grain soils. For interpretation of the results, particularly how M sub R is affected by saturation, the four-phase concept for unsaturated soils is used.
总页数：	Transportation Research Record. 1995. (1481) pp21-27 (5 Fig., 3 Tab., 25 Ref.)
报告类型：	科技报告