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.
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