Research on technology of obtaining undisturbed soil samples from Wuhan first stage terrace of the Yangtze River

Abstract:

In this paper， the current technical standards and industry status for obtaining undisturbed soil samples is introduced， moreover， the drilling methods， comprehensive analysis of suitability for sampling tool selection， soil sample packaging and transportation methods are studied. The comparative experimental research indicates that the original obtained samples show excellent performance in on-site quality evaluation， indoor sample preparation， and experimental performance under the following two conditions in Wuhan first stage terrace of the Yangtze River. In clay laye， hammer drilling combined with open thin-walled soil samplers is adopted， while in sandy soil layer， the hammer and rotary drilling combined with built-in ring cutter soil sampler is used supplemented by rubber cover and tape sealing. Based on this method， the original structure of the sample is less disturbed， and the original structural force of the soil is also well maintained.

Key words:undisturbed sample;soil sampler;engineering investigation;geotechnical test;hammer drilling;rotary drilling;Wuhan first stage terrace of the Yangtze River