[最新文献]钻探不精确性以及划定施工和地质超前性界限的评估[12/07/2020]

1 论文

Assessment of drilling inaccuracy and delineation of constructional and geological overbreak 钻探不精确性以及划定施工和地质超前性界限的评估

Highlights

•The drilling errors of manual jumbos are 1.3% for the level and 2.1% for the ramp.

•There is a direct nonlinear negative correlation between the rockmass and overbreak.

•Computerized jumbos have possessed greater drilling accuracy than manual jumbos.

•Below Q-value 10, the region may define as constructional and geological overbreak.

•Beyond Q-value 10, the region may designate as a zone of constructional overbreak.

Abstract：Overbreak in underground excavation is one of the undesirable outcomes that may emerge from many quality-compromising events. Among these, the drilling and blasting generally are one of the most important contributing parameters. This paper focuses on the study of drilling inaccuracy in manual drilling operations and the contribution of geological discontinuities to overbreak. A total of 855 blasts were conducted using conventional manual jumbo and computerized semi-automatic jumbo in different rock mass conditions wherein RMR varied from 45 to 75 and Q-value from 0.46 to 45. This was done to investigate the influence of rock mass quality on overbreak in underground drivage. From the study, it was found that 2.1% and 1.3% of overbreak tend to cause due to manual drilling inaccuracy of ramp and level drivages, respectively. Besides, the geological discontinuities have an effect on overbreak upto the Q-value 10 and this may be termed as geological and constructional overbreak. Above the critical point (Q-value 10) in the rock mass scale, the region may be termed as constructional overbreak due to the only presence of constructional error.

摘要：地下开挖中的超限是许多影响质量的事件中可能出现的不良结果之一。其中钻爆一般是最重要的贡献参数之一。本文主要研究人工钻探作业中的钻探误差以及地质不连续性对过爆的贡献。在不同岩体质量条件下，采用传统的人工巨炮和计算机半自动巨炮共进行了855次爆破，其中RMR从45到75不等，Q值从0.46到45。这是为了研究岩块质量对地下动力系统过断的影响。研究发现，分别有2.1%和1.3%的超前破碎是由于人工钻探坡道和水平传动装置不准确造成的。此外，地质不连续对Q值10以下的超前破碎也有影响，可称为地质和施工超前破碎。在岩体规模的临界点（Q值10）以上，由于只存在施工误差，该区域可称为施工性超前。

2 相关文献

Note: '相关文献' 是按照Google的排序算法产生出来的.

[1] Drill and Blast Performance Evaluation at the Obra Pit

[2] Ore Delineation in Three Dimensions

[3] Guide to soil nail design and construction

[4] Guide to Site Investigation

[5] Drilled Shafts: Construction Procedures and LRFD Design Methods

[6] Siting Considerations & Initial Planning

[7] Well design and construction for monitoring groundwater at contaminated sites

[8] A Comparative Analysis of Horizontal Directional Drilling Construction Methods in China

工程岩体分类RMS(Rock Mass Strength)

工程岩体分类的简要回顾

Deere's RQD---现代岩体工程分类方法的基石 (Part II)

Deere's RQD---现代岩体工程分类方法的基石 (Part I)

Q-System岩石块体尺寸的估算(RQD/Jn)

边坡工程岩体分类系统Q-slope