Recommendations for High-Quality Field Sampling Procedures: Using the Dames and Moore (DM) Hydraulic Fixed-Piston Thin-Walled Tube Sampler

Abstract

These guidelines are provided to improve the likelihood of retrieving high quality samples using the Dames & Moore (DM) hydraulic fixed-piston thin-walled tube sampler in a cased mud-rotary boring. High quality samples are often referred to as “undisturbed” samples, although it is recognized that no sample can be retrieved without some minimal amount of disturbance. The aim of “undisturbed” sampling is to reduce sample disturbance effects to the point where they have a minor, trackable effect on the results of laboratory testing. Thus, the resulting sample disturbance effects are minor and can be assessed confidently while interpreting test results. DM sampling is a highly specialized operation and requires an experienced drilling team that is familiar with the sampling equipment and procedures. The precise detail of this operation is beyond the scope of this document. The notes that follow have been prepared for use by engineers planning and undertaking geotechnical investigations. They are intended to provide information and guidance at key points to help improve the quality of the sampling operation.