Showing papers on "Soil compaction published in 1972"
Journal Article•
Abstract: Although the curve of dry density versus moisture content commonly yielded by the standard AASHO compaction tests contains a single maximum, some soils have produced more complicated curves. Because these soils have not been well studied, extensive work has been carried out to establish the existence of irregularly shaped curves. The primary effort was focused on examining, from both a macroscopic and a microscopic level, the characteristics that lead to such curves. The investigation has established 4 types of compaction curves: one with a single peak, one with an irregular 1 1/2 peak, one with a double peak, and one that is almost a straight line with no distinct maximum dry density or optimum water content noted. There is a correspondence between the index properties on the modified Casagrande's chart and the kind of curve. The mineral constituents of the soil samples also affect the shape of the moisture-density compaction curve.
59 citations
33 citations
TL;DR: In this article, the Bureau of Reclamation investigated the soil-structure interaction of flexible pipe buried in a large container, using clay as a cover and subjecting them to surcharge loads.
Abstract: To lower construction costs of closed-conduit systems, the Bureau of Reclamation has investigated the soil-structure interaction of flexible pipe buried in a large container, using clay as a cover and subjecting them to surcharge loads. The results are both interesting and incisive. placed in the pipe to prevent the relatively flexible pipe from deforming during the soil compaction around the pipe. The pipe also was braced into place to prevent it from rising during soil compaction under the sides of the pipe. The soil was then compacted beside the pipe and on up to the top of the container. Then a wooden load plate was placed on the soil surface to distribute the surcharge load from the testing machine. A sectional drawing of the pipe in place in the container is shown in Fig. 1. As the backfill soil was placed in the soil container and around the pipe, two density determinations were made for every foot of depth of compacted soil. The mean density for each separate 90 per cent backfill pipe test ranged from 88.5 to 91.4 per cent Proctor, with an average mean for all of the tests of 90.2 per cent Proctor. The standard deviation for the densities in each test
20 citations
20 citations
1 Jan 1972
TL;DR: In this paper, the authors discuss the application of the principal principals of SOIL MECHANICS to real-world problems, including over-buried stress in SOILS.
Abstract: THIS VOLUME DEALS WITH THE APPLICATION OF THE FUNDAMENTAL PRINCIPLES OF SOIL MECHANICS TO REAL FOUNDATION PROBLEMS, AND INCLUDES THE FOLLOWING: METHODS OF EVALUATION OF OVERBURDEN STRESSES IN SOILS AND THE DETERMINATION OF STRESS INCREMENTS INDUCED BY APPLIED LOADING; DETERMINATION OF ALLOWABLE BEARING STRESSES, WITH THE CONSIDERATION OF ULTIMATE BEARING CAPACITY AND SETTLEMENT AND RATES OF SETTLEMENT, STABILITY OF NATURAL AND ARTIFICIAL SLOPES; DETERMINATION OF THRUST ON RETAINING STRUCTURES AND THEIR STABILITY; EFFECTS OF FROST AND PREVENTIVE METHODS; COMPACTION OF SOILS; AND METHODS OF OBSERVATION OF SETTLEMENT OF STRUCTURES. /TRRL/
8 citations
7 citations
6 citations
Journal Article•
TL;DR: A 10.6 ton, SMOOTH DRUM, VIBRATING ROLLER was used to compare a 24 IN. LOOSE LIFT THICKness of RED-BROWN LOAMY-CLAY at two speeds of TRAVEL, 3.5 and 5.0 MPH.
Abstract: A 10.6 TON, SMOOTH DRUM, VIBRATING ROLLER WAS USED TO COMPACT A 24 IN. LOOSE LIFT THICKNESS OF RED-BROWN LOAMY-CLAY AT TWO SPEEDS OF TRAVEL, 3.5 AND 5.0 MPH. COMPACTION AND MOISTURE CONTENT TESTS WERE TAKEN AT INTERVALS OF 0-6 IN. AND 9-15 IN. BELOW THE SURFACE OF A COMPACTED EMBANKMENT OF THIS SOIL AFTER 2, 4, 8, 16 AND 32 PASSES TO DETERMINE: (A) DENSITY, MOISTURE CONTENT, AND NUMBER OF ROLLER PASSES INTER- RELATIONSHIPS; (B) VARIATION OF COMPACTION WITH DEPTH; (C) EFFECT OF THE DIFFERENT ROLLERS SPEEDS OF TRAVEL; (D) PRODUCTIVE CAPACITY OF THE ROLLER; AND (E) COMPARISON OF RESULTS WITH THOSE OBTAINED FROM PREVIOUSLY TESTED SOILS. /AUTHOR/