Analysis and Application of Circulating Drilling Hole
Depth of Working Face Pregrouting for Shaft No. 1 of Gaoligongshan Tunnel

RAN Haijun; ZHANG Wenjun; GAO Guangyi; ZHANG Zhen

doi:10.3973/j.issn.2096-4498.2021.03.011

2021 , Vol. 41 >Issue 3: 427 - 432

DOI: https://doi.org/10.3973/j.issn.2096-4498.2021.03.011

Analysis and Application of Circulating Drilling Hole Depth of Working Face Pregrouting for Shaft No. 1 of Gaoligongshan Tunnel

RAN Haijun ,
ZHANG Wenjun ,
GAO Guangyi ,
ZHANG Zhen

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(1. China Railway Tunnel Group Co., Ltd., Guangzhou 511458, Guangdong, China; 2. Yungui Railway Yunnan Co., Ltd., Kunming 650011, Yunnan, China； 3. China Railway Tunnel Consultants Co., Ltd., Guangzhou 511458, Guangdong, China)

Online published: 2021-04-03

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Abstract

Pregrouting technology is often adopted to rapidly seal the water leakage of the working face of the deep and large vertical shaft constructions of a railway. In this paper, a case study is conducted on the shaft No. 1′s water seal of the Gaoligongshan tunnel on DaliRuili railway in weathered granite formation using working face pregrouting. A targeted working face pregrouting scheme of exploration + grouting is determined according to the geological conditions revealed through inspection holes and excavation results. Based on field tests, the influences of the pregrouting scheme, drilling efficiency, and drilling hole depth on grouting effect and efficiency are analyzed; in conclusion, the optimal depth of the shaft No. 1′s drilling hole of the Gaoligongshan tunnel is 60 m. A rational drill hole depth can help in improving comprehensive construction progress by 6.3%~15.8%, guarantee the water seal effect of working face pregrouting, improve comprehensive construction efficiency, and save construction cost.

Key words： railway tunnel; deep and large shaft; working face pregrouting; circulating drilling hole depth; construction efficiency

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RAN Haijun , ZHANG Wenjun , GAO Guangyi , ZHANG Zhen . Analysis and Application of Circulating Drilling Hole Depth of Working Face Pregrouting for Shaft No. 1 of Gaoligongshan Tunnel[J]. Tunnel Construction, 2021 , 41(3) : 427 -432 . DOI: 10.3973/j.issn.2096-4498.2021.03.011

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