砂土卵石地层高频冲击直推半合管取样工艺应用研究

High frequency impact direct push split tube sampling technology for sandy pebble layers

摘要:

地层的取样质量决定了污染场地调查的准确性，获取无污染、无扰动、结构完整且取心率要达到一定要求的样品对于环境取样具有十分重要的意义。砂土卵石地层软硬交错、结构松散，造成取样率低、样品结构易破坏、钻进取样效率低等问题。本文采用高频冲击直推钻机，配合半合管取样钻具，以乌海市重点行业企业某化工园区的污染详查工作为例，介绍了高频冲击直推半合管取样工艺及其应用效果。该工艺在砂土卵石地层中岩心采取率达85%以上，样品原状性好，为后期该类地层的钻探取样提供了可靠的参考依据。

Abstract:

Formation sampling quality determines the accuracy of contaminated site investigation. It is of great significance for environmental sampling to obtain samples without pollution or disturbance， but with the intact structure and the required core recovery. The sandy pebble layer is featured of soft and hard alternating with loose structure， resulting in low sampling rate， easy damage to the sample structure and low sampling efficiency. With regard to the pollution detailed investigation of a chemical park of a key industrial enterprise in Wuhai City where the high-frequency impact direct push drill was used together with the split tube sampling drilling tool， this paper introduces the high-frequency impact direct push split tube sampling technology and its application performance. The core recovery of this process in the sandy pebble layer was more than 85%， and the samples were kept highly undisturbed， which provides a reliable reference basis for drilling and sampling in this kind of stratum in the later stage.