Combined Application of Pipe Roof Pre-SUPPORT and Curtain Grouting Pre-Reinforcement in Closely Spaced Large Span Triple Tunnels
Source abstract
Abstract
The platform of the Badaling Great Wall Underground Station consisted of large span triple tunnels. The triple tunnels passed through several major faults. Based on preliminary in situ monitoring, the interaction behavior among triple tunnels was significantly severe, and the original supports failed to meet the safety requirement. Therefore, pipe roof pre-support (PRPS) and curtain grouting pre-reinforcement (CGPR) were used as the pre-construction techniques. By numerical investigation, the pipe diameter, the arrangement angle of PRPS, and the grouting thickness of CGPR were optimized as 108 mm, 150°, and 3 m, respectively. According to numerical results, PRPS predominantly bore loose rock and reduced mean crown settlement (MCS), while CGPR primarily improved the mechanical properties of rock and decreased the pillar plastic ratio (PPR). PRPS and CGPR had complementary advantages in time, space, and mechanical properties. PRPS could timely form a strong arch structure far ahead of the tunnel face, CGPR could effectively restrict the development of plastic zone. They mutually and actively formed a strong permanent ring in front of the tunnel face. After the field application of PRPS and CGPR, the mean surrounding rock pressure reduced by 33.4%, the MCS reduced by 58.7%, and no support damage was observed. The excavation safety was guaranteed.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Grouting, Rheology, and Soil Mechanics · Geotechnical Engineering and Analysis · Geotechnical Engineering and Underground Structures
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Key Laboratory for Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China
China Highway Engineering Consulting Group Company LTD, Beijing 100088, China
Funding
National Natural Science Foundation of China · National Key Research and Development Program of China
References (29)
Show source-provided references
1. Load transferring mechanism of pipe umbrella support in shallow-buried tunnels10.1016/j.tust.2014.05.018 ↗
2. Control of surface settlements with umbrella arch method in second stage excavations of Istanbul Metro10.1016/j.tust.2007.12.005 ↗
3. Volkmann, G.M., and Schubert, W. (2011, January 8–10). Advantages and specifications for pipe umbrella support systems. Proceedings of the 14th Australasian Tunnelling Conference, Auckland, New Zealand.
4. The types of tunnels maintenance in umbrella arch method10.4236/ojce.2016.62014 ↗
5. Modeling the pipe umbrella roof support system in a Western US underground coal mine10.1016/j.ijrmms.2012.12.037 ↗
6. Application of the NATM method in the road tunneling works in difficult geological conditions—The Carpathian flysch10.1016/j.tust.2018.01.003 ↗
7. Comparison of permeability and groutability of Ostur Dam site rock mass for grout curtain design10.1007/s00603-012-0282-6 ↗
8. Back analysis of grout treatment at Sumbar Dam using the joint hydraulic factor10.1007/s00603-014-0706-6 ↗
9. Groundwater control and stability in an excavation in Magnesian Limestone near Sunderland, NE England10.1016/S0013-7952(01)00100-4 ↗
10. Stability analysis and design of stabilization measures for Chenab railway bridge rock slopes10.1007/s10064-019-01602-2 ↗
11. Shallow tunnelling method (STM) for subway station construction in soft ground10.1016/j.tust.2011.12.007 ↗
12. Movements of ground and existing structures induced by slurry pressure-balance tunnel boring machine (SPB TBM) tunnelling in clay10.1016/j.tust.2019.103278 ↗
13. Predictive permeability model of extensional faults in crystalline and metamorphic rocks; verification by pre-grouting in two sub-sea tunnels, Norway10.1016/j.jsg.2008.04.001 ↗
14. A review of the Namntall Tunnel project with regard to grouting performance10.1016/j.tust.2010.01.009 ↗
15. Grouting techniques for the unfavorable geological conditions of Xiang’an subsea tunnel in China10.1016/j.jrmge.2014.07.005 ↗
16. Ground reaction curves for deep circular tunnels considering the effect of ground reinforcement10.1016/j.ijrmms.2013.01.003 ↗
17. Axisymmetric analysis of ground reinforcing in tunnelling design10.1016/0266-352X(95)93871-F ↗
18. Effects of twin tunnels construction beneath existing shield-driven twin tunnels10.1016/j.tust.2014.10.001 ↗
19. Blast vibration of a large-span high-speed railway tunnel based on microseismic monitoring
20. Safety distance of shotcrete subjected to blasting vibration in large-span high-speed railway tunnels
21. Geotechnical monitoring and safety assessment of large-span triple tunnels using drilling and blasting method10.21595/jve.2019.20615 ↗
22. Liu, D., Zhang, D., Fang, Q., Sun, Z., Cao, L., and Li, A. (2020). Displacement characteristics of shallow-buried large-section loess tunnel with different types of pre-supports: A case study of New Badaling Tunnel. Appl. Sci., 10.10.3390/app10010195 ↗
23. Protection of buildings against damages as a result of adjacent large-span tunneling in shallowly buried soft ground10.1061/(ASCE)GT.1943-5606.0000823 ↗
24. Geological Investigation and Tunnel Excavation Aspects of the Weakness Zones of Xiang’an Subsea Tunnels in China10.1007/s00603-016-1076-z ↗
25. Influence of mesh geometry on three-dimensional finite-element analysis of tunnel excavation10.1061/(ASCE)1532-3641(2005)5:3(256) ↗
26. Shi, Y., Fu, J., Yang, J., Xu, C., and Geng, A.D. (2017). Performance evaluation of long pipe roof for tunneling below existing highway based on field tests and numerical analysis: Case study. Int J. Geomech., 17.10.1061/(ASCE)GM.1943-5622.0000933 ↗
27. Shi, Y. (2014). Study on Mechanical and Engineering Application of Advanced Support for Lower Overburden Tunnel in Weak Stratum. [Ph.D. Thesis, Central South University].
28. Sun, Z., Zhang, D., and Fang, Q. (2019). Determination method of reasonable reinforcement parameters for subsea tunnels considering ground reinforcement and seepage effect. Appl. Sci., 9.10.3390/app9173607 ↗
29. Analytical scrutiny of loosening pressure on deep twin-tunnels in rock formations10.1016/j.tust.2018.10.007 ↗