Bentonite densification by dynamic compaction.

摘要

A series of laboratory compaction tests on bentonite and bentonite-sand mixtures were conducted. Based on the tests, this study investigates the densification behaviors of (1) bentonite mixed with deionized distilled water; (2) bentonite mixed with WIPP brine; and (3) bentonite-sand mixtures. Density-moisture curves are estimated using multiple linear regression analysis for all three cases. In (1) and (2), the influences of compactive energy, rammer weight on the density-moisture curves are evaluated. In (3), the influences of compactive energy, sand grain size and mixing ratio of bentonite to sand on density-moisture curves are evaluated. Dummy variables are used in the regressions. Stepwise regression is employed for the model building and the regression implementation. A basic regression model is derived and built based on a classical soil dry density calculation formula by applying the Taylor series principle.