津南区分层标组地质鉴别孔松散层取芯施工技术与效果分析

Coring construction technology and effect analysis for loose layer of geological identification hole of layer group in Jinnan district

津南区分层标组工程建设中,首先进行了地质鉴别孔D1孔的施工,用以探明标站地层结构和岩性特征。D1孔采用XY-5地质岩芯钻机施工,终孔深度806. 15 m岩芯平均采取率94.9%,终孔孔斜2.4°。创造了我队XY-5地质岩芯钻机施工深度之最。本文总结了津南区分层标组工程建设中地质鉴别孔D1孔施工方法和经验体会,工程验证结果表明,该钻孔施工中所采用的施工方法与钻进参数选取得当,应用效果良好,达到了预期设计效果。

In the construction of stratified standard group in jinnan district,the construction of geological identification hole D1 is first carried out to verify the stratigraphic structure and lithological characteristics of the standard station. Hole D1 is constructed with XY-5 geological core drilling rig,and the final hole depth is 806. 15 m. The construction depth of our XY-5 geological core drill is the highest. This paper summarizes the construction method and experience of geological identification hole D1 in the construction of stratified standard group in jinnan district.