Application of direct push sampling and well drilling technology with the hollow auger split-tube in contaminated site investigation

Abstract:

The exploration of soil and groundwater in contaminated sites needs to meet the requirements of sampling and well construction at the same time. The hollow auger split-tube can provide some self-driving， which can drill groundwater monitoring wells while obtaining low-disturbance soil samples. This paper analyzes the technical characteristics of the hollow auger， and ，puts forward the direct push sampling and well construction technology with the hollow auger split tube based on the direct push environmental sampling equipment. Field tests were carried out in the quaternary sandy soil stratum with the relative density of sandy soil of 0.46~0.83（12~16m）， and the test results show that the hollow auger split-tube method can effectively solve the problem with the traditional direct-push sampling method by which it is difficult to reach the predetermined depth in the firm soil area； meanwhile the core recovery was higher than 90%. The technology is a kind of environmental sampling technology worthy of promotion.

Key words:hollow auger split-tube;direct pushing technology;polluted site survey;soil sampling;groundwater monitoring well