This report deals with the results of the measurement of the ground surface displacement and strain by means of a ground surface strainmeter and a displacement pile. These experiments were made at two different sites, where the base failure of an embankment had been apprehended in the course of step by step construction on a very soft foundation. Through these observations, it was noticed that the measuring of strain is one of the useful predictive method of the failure.

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At the consolidation stage of triaxial tests, the author has recognized that the horizontal coefficient of consolidation c_h is readily obtained by using a proper paper drain and by measuring end pore pressure or volume change of the sample. In this paper, the above statiment is theoretically examined and a method to determine the value of c_h from the test data is proposed. Furthermore, the methods of paper drain are experimentally investigated and some test results are shown.

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