The Study of Construction Countermeasures about Subway Tunnel Passes through High Fill Geological Area of Crushed Rock Soil

Abstract:

This is an important technical problem that subway tunnel excavation pass through a filled area of crushed rock soil in mountainous city,and to control the ground surface settlement and reduce the influence for existing building have great significance. The paper presents an example that tunnel excavation pass through complex geological area of metro line no.3 project in Chongqing.At first,according to the monitoring results,the big surface subsidence and structures cracking appear in the process of the tunnel excavation are discussed.And then,use the finite element method analysis and calculation. On the basis of the analysis and calculation results, many effective technical measures are proposed to ensure stability of surrounding rock and control the ground surf ace settlement. Such as small catheter grouting consolidation, CD construction method, excavation speed control and so on. The monitoring results show that the vault sinks and convergence value reduce significantly after the improved technology measures are used.At same time,the ground surface settlement is controlled effec- tively. The results show that the improved construction measures achieve the purpose to control the settlement and deformation. The study result of construction scheme can provide reference for the similar project.

• Periodical: Applied Mechanics and Materials (Volumes 170-173)
• Pages: 1801-1809
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.170-173.1801
• Online since: May 2012
• Authors: Lin Qing Huang, Tong Qing Wu, Zhi Gang Qi
• Keywords: Construction Countermeasures, Crushed Rock Soil, Ground Surface Settlement, High Fill, Shallow Buried Tunnel

References

[1] A ttewel l P B, Yeates J , S1A. R. Soil movements induced by tunneling and the effects on pipelines and structures[M].1986, London: Black I E and Son.

[2] Jianling-Huang,Guanwu-Yang.et,al.Safety Assessment Method for Buildings nearby Mining Metro[J]. China railway science,2009,Vol.30(2):77-81.

[3] Zhi-Wang,Shouji-Du,et.al, Analysis of Construction Settlement of Shallow Railway Tunnel under Crossing the Highway[J].Chinese Journal of Underground Space and Engineering, 2009,Vol.5(3):531-535.

[4] Mengshu-Wang.Theory and technology of shallow tunnel excavation[M]. Hefei: Anhui Education Press, 2004.

[5] Bo-Wu,Bo-Gao. Study of Ground Subsidence Induced by Urban Subway Tunneling underComplicated Conditions [J].China Railway Science,2006,27(6):129-131.

[6] Qinghao-YU, Zhiping-Gao, Yongtao- Xie. Case Study on Settlement Control in Construction of Shallow-buried Large-span Multi-arch Tunnel Crossing underneath Existing Buildings [J].Tunnel Construction, 2010, 30(1):67-70.

[7] Weibing-Lei. Construction Technology for Wenfu Railway Guantouling Tunnel under Crossing the Highway Tunnel[J]. Chinese Journal of Underground Space and Engineering, 2007,3(4):758-764.

[8] Qinghai-Deng, Fengshan-Ma, Renmao-Yuan,et,a1.The hydrogeology and environmental efects of the excavation of the extra-long tunnel of the Shi-tai passenger dedicated railway [J]. Quaternary Sciences,2006,26(1):136-143.

[9] Tianming-Wang.Research on the Scheme for Construc tion of Large Span Three-arch Tunnel Underpass Building [J].Journal of railway engineering society,2008.10:28-31

[10] Jihong-Bi,Yudung-Du,Bin-Chang.The finite element analysis of the construction of the shallow embedded adjacent double tunnels in soft soil[J].Special Structures,2007, 24(3):102-105.