摘要：

THE AIMS, DURING THE PAST 20 YEARS, OF THE CAMBRIDGE RESEARCH PROGRAM IN SOIL MECHANICS ARE OUTLINED. THE PRINCIPAL OBJECTIVE IS TO DEVELOP AN UNDERSTANDING OF THE STRESS-STRAIN BEHAVIOR OF SOILS SO THAT RELIABLE PREDICTIONS CAN BE MADE CONCERNING THEIR LOAD-DEFORMATION CHARACTERISTICS AT ALL WORKING LOADS, RATHER THAN ONLY AT FAILURE, IN PRACTICAL PROBLEMS. A SUPERSTRUCTURE AND ITS FOUNDATION CAN THEN BE DESIGNED AS A UNIT. THE PRESSING NEED FOR THE STUDY OF THE LOAD-DEFORMATION BEHAVIOR OF SOILS IN MIXED BOUNDARY VALUE PROBLEMS AT MODEL SCALE IS EMPHASIZED. NEW VERSATILE SHEAR TEST EQUIPMENT WHICH CAN IMPOSE A WIDE RANGE OF STRESS AND/OR STRAIN PATHS, TOGETHER WITH NON-DESTRUCTIVE METHODS OF CHECKING THE UNIFORMITY OF THE BEHAVIOR OF SPECIMENS, ARE BRIEFLY DESCRIBED. TYPICAL DATA ARE PRESENTED FOR ONE PROBLEM, ILLUSTRATING THE VARIATION OF THE PASSIVE PRESSURE ON A RETAINING WALL WITH THE DISPLACEMENT OF THAT WALL INTO SAND. A REVISED STATEMENT OF THE MOHR-COULOMB FAILURE CRITERION IS PROPOSED. /AUTHOR/

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