ESTUDIO DE LA TIXOTROPÍA DE LOS SEDIMENTOS LACUSTRES DE LA CIUDAD DE MÉXICO

Abstract

This thesis work appointed “Studio of Aging to the lakes deposits to Mexico city”, is an experiment for measuring the recovery of strength of one representative soil sample to Mexico City in laboratory, which one was submitted to disturbed. This recovery had been studied from along time by researches like Bjerrum (1967), Mesri (1975) and recently Díaz Rodriguez (1998). The recovery of this strength has been associated basically the time, in which is introducing changes in their particles and organic molecules, so this changes in its geometric arrangement. The essential concept of this study is to find the delay time the soil sample in recovery their strength properties in original state, it was possible through a scale model of one soil sample and one recipient in which were couple special pieces named “bender elements”, whit which through of emissions of waves into the sample were measured the arrived times, knowledging the length of the sample was possible to determinate the velocity of strength wave, this finally allowed to estimate the variation in the stiffness of soil sample during the period of 2 months. With the contribution of this test was possible to identify the time of 5022 years so that sample reach its original stiffness, value which was calculated with the equations that threw the tendency of the measurements of series make with the velocities. In other hand, this work contributed to the “Characterization of soil to the Mexico City” project, which actually is headed by Dr. Abraham Diaz Rodriguez in the DEPFI UNAM.