潜孔锤反循环钻进技术在某水电站的试验应用

吉林大学学报(地球科学版)

潜孔锤反循环钻进技术在某水电站的试验应用

殷其雷，殷琨，柳鹤，甘心

吉林大学建设工程学院/国土资源部复杂条件钻进技术开放研究实验室，长春130026

收稿日期:2013-09-04 出版日期:2014-05-26 发布日期:2014-05-26
通讯作者: 殷琨（1952-），男，教授，博士生导师，主要从事多工艺冲击回转钻进技术研究 E-mail:yinkun@jlu.edu.cn
作者简介:殷其雷(1984-)，男，博士研究生，主要从事潜孔锤反循环钻进技术研究，E-mail:283708807@qq.com
基金资助:
中国地质调查局地质调查项目（1212010816018）；吉林大学基本科研业务经费项目（421032194424）

Application Test of DTH Hammer Reverse Circulation Drilling Technique in a Hydropower Station

Yin Qilei, Yin Kun, Liu He, Gan Xin

College of Construction Engineering, Jilin University/Key Lab of Drilling and Exploitation Technology in Complex Conditions, Ministry of Land and Resources, Changchun130026, China

Received:2013-09-04 Online:2014-05-26 Published:2014-05-26

摘要/Abstract

摘要：

水利工程中的钻孔工程具有特殊的工况，采用正循环潜孔锤钻进方法在狭窄封闭的洞室内进行钻孔施工，粉尘污染严重，施工环境恶劣，影响作业工人的身体健康。为了解决施工洞室内的粉尘污染问题，在某水电站的排水孔施工中，首次应用了潜孔锤反循环钻进技术，并在上仰孔和下行孔施工试验中获得成功，有效控制和降低了洞室内的粉尘问题，有利于维护良好的施工环境。设计的A、B两种结构类型钻头主要差别是内喷孔的位置不同，A型钻头的内喷孔设计在花键上的各个平键之间，B型钻头的内喷孔则设计在花键的平键上。CFD数值模拟计算结果显示,A型钻头对环空抽吸的空气量是0.199 987 04 kg/s,略大于B型钻头的0.177 524 64 kg/s，说明A型钻头的抽吸能力优于B型钻头。上仰孔和下行孔的钻进试验结果表明，内喷孔设计在花键上的各个平键之间且具有双排12个内喷孔的A型钻头结构更为合理，在施工中A型钻头比B型钻头的孔口粉尘少。从反循环排渣效果看，A型钻头破碎的大部分岩粉和大颗粒岩块从中心通道排出，反循环排渣效果优于B型钻头。

关键词: 潜孔锤反循环, 反循环钻头, 上仰孔, 粉尘污染, 环境保护

Abstract:

The drilling tasks in hydraulic engineering were usually under severe conditions. In the narrow closed cavity, the normal DTH hammer drilling technique was generally applied to drill boreholes, but dust pollution will seriously affect the working environment and workers’ health. To solve the dust pollution in the cavity, reverse circulation drilling technique with DTH air hammer was firstly applied to drill the drain holes in the cavity of a hydropower station, and the upward and downward holes were successfully drilled. The reverse drilling technique with DTH air hammer can control and reduce the dust pollution in the cavity. Furthermore, this technique can maintain good working environments. Two types of drill bits with different structures were designed for test, which were named as type A and B, respectively. The main difference between type A and B drill bits were the positions of suction nozzles. The suction nozzles of type A drill bit were evenly distributed between any two flat keys of the spline. While the suction nozzles of type B were distributed on every flat key of the spline. The CFD numerical simulation results had shown that the air suction rate in annular space of type A drill bit was 0.199 987 04 kg/s, which is slightly larger than that of type B drill bit with a air suction rate of 0.177 524 64 kg/s in annular space between drilling tool and borehole wall . In other words, type A drill bit can suck more air from the annulus space. The test results on drilling upward and downward holes indicated that the structure of drill bit which has double row with 12 suction holes on the spline had the stronger suction capacity and better reverse circulation effect of the slag discharge. Therefore, there was less dust in the cavity and more rock cuttings discharged from the central channel while using type A drill bit. In hence, the reverse circulation discharging effect of type A drill bit is superior to that of type B drill bit.

Key words: reverse circulation with DTH hammer, reverse circulation drill bit, upward borehole, dust pollution, environment protection

中图分类号:

TV538.3

殷其雷，殷琨，柳鹤，甘心. 潜孔锤反循环钻进技术在某水电站的试验应用[J]. 吉林大学学报(地球科学版), 2014, 44(3): 961-968.

Yin Qilei, Yin Kun, Liu He, Gan Xin. Application Test of DTH Hammer Reverse Circulation Drilling Technique in a Hydropower Station[J]. Journal of Jilin University(Earth Science Edition), 2014, 44(3): 961-968.

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