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LABORATORY INVESTIGATION OF SOIL INFILTRATION THROUGH PIPE JOINTS.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
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A laboratory investigation was made to develop a system of classifying soils according to the degree that soil infiltration through openings in joints or seams of pipe in storm-drain systems can be expected to occur. The soils tested were a poorly graded, medium to fine sand, a uniformly graded, fine sand, a silt, and a lean clay. The investigation included design and construction of a model simulating a prototype pipe joint, study of the feasibility of using the model for such studies, investigation of the variables affecting soil infiltration, and investigation of the infiltration characteristics of the four soils. Results showed that the model provided a feasible means of studying soil infiltration through pipe joints. The important factors leading to such infiltration are soil grading, density, and size and configuration of joint opening. Relations between these variables were indicated for the soils tested. The study also indicated that externally induced vibration has a significant effect on infiltration of cohesionless soil. The importance of determining the size of pipe-joint openings existing in field installations of various sizes and types of drainage pipe was recognized. Although the model simulated pipe-joint openings, the test results are applicable to other types of pipe openings such as cracks in rigid pipe. Author
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