Study on Construction and Reinforcement Technology of Dolomite Sanding Tunnel

Meiqian Wang, Wei Xu, Hongyuan Mu, Jian Mi, Yonghong Wu and Yangxing Wang
Additional contact information
Meiqian Wang: Faculty of Civil and Architectural Engineering, Kunming University of Science and Technology, Kunming 650500, China
Wei Xu: Faculty of Civil and Architectural Engineering, Kunming University of Science and Technology, Kunming 650500, China
Hongyuan Mu: Yunnan Institute of Water & Hydropower Engineering Investigation, Design and Research, Kunming 650021, China
Jian Mi: Yunnan Institute of Water & Hydropower Engineering Investigation, Design and Research, Kunming 650021, China
Yonghong Wu: Faculty of Civil and Architectural Engineering, Kunming University of Science and Technology, Kunming 650500, China
Yangxing Wang: China Railway Tunnel Stock Co., Ltd., Zhengzhou 450000, China

Sustainability, 2022, vol. 14, issue 15, 1-20

Abstract: The No. 2 conduit of the Xiaopu Tunnel in the Yuxi section of central Yunnan’s water diversion project is taken as the research object, starting from the geological conditions along with the characteristics, formation mechanism and evolutionary model of dolomite sanding. This paper discusses the engineering problems of the project’s tunnels with dolomite sanding in the water-rich section, and its corresponding engineering reinforcement plan. It was found that in the tunnel section with normal level of dolomite sanding, there was no water seepage, where measures such as advanced small conduit, mechanical excavation, short grubbing and strong support could all be adopted for safe passage. Even in the water seepage section of the weak dolomite sanding tunnel, the surrounding rock was found in close interlock with strong self-stability. The excavation and support were implemented according to the category of normal surrounding rock. In the water-rich sections with strong and intense dolomite sanding, gushing of water and sand were quite frequent, with developed fissures, broken rock masses and rich waters. During the engineering operation, phosphoric acid and sodium silicate slurry in addition to urea formaldehyde resin and oxalic acid slurry plus Malisan and liquid catalyst slurry were first prepared for water plugging. Then, pure water slurry was used for surrounding rock reinforcement, which exerted an excellent effect. This method can provide reference for reinforcing tunnels of sandy dolomite in other areas of projects.

Keywords: tunnels with dolomite sanding; grouting; water and sand inflow; surrounding rock reinforcement (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/2071-1050/14/15/9217/pdf (application/pdf)
https://www.mdpi.com/2071-1050/14/15/9217/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jsusta:v:14:y:2022:i:15:p:9217-:d:873218

Access Statistics for this article

Sustainability is currently edited by Ms. Alexandra Wu

More articles in Sustainability from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().